Physics-week-11-20.docx

PHYSICS LA 8 A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is the time interval required for it to reach a 10-rad displacement after starting from rest? Select one: a. 2.0 s b. 56 s c. 18 s d. 28 s Correct Feedback The correct answer is: 28 s Comments Make comment or override mark

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A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is the average tangential acceleration of a point on the wheel's edge? Select one: a. 14 m/s2 b. 28 m/s2 c. 0.60 m/s2

Correct d. 0.45 m/s2 Feedback The correct answer is: 0.60 m/s2 Comments Make comment or override mark

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A bank vault is opened by applying a force of 300 N perpendicular to the plane of the door, 1.2 m from the hinges. Find the torque due to this force about an axis through the hinges. Select one: a. 300 N·m b. 660 N·m c. 360 N·m Correct d. 330 N·m e. 250 N·m Feedback The correct answer is: 360 N·m Comments Make comment or override mark

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The torque caused by a force F applied at a distance r from the axis of rotation, is given by τ = rF sinθ, where θ is the angle between and . If the magnitudes r and F remain the same, what other angle θ' will produce the same torque as was produced at angle θ if θ was less than 90°? Select one: a. θ' = 90° - θ b. None of the above. c. θ' = 90° + θ d. θ' = 180° - θ Correct Feedback The correct answer is: θ' = 180° - θ Comments Make comment or override mark

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A 0.300-kg object is swung in a circular path and in a vertical plane on a 0.500-m length string. If the angular speed at the bottom is 8.00 rad/s, what is the tension in the string when the object is at the bottom of the circle? Select one: a. 12.54 N Correct b. 9.6 N c. 25.08 N d. 23.52 N e. 41.34 N Feedback The correct answer is: 12.5

PHYSICS SQ 8 A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods? Select one: a. 0.16 kg·m2 Correct b. 0.096 kg·m2 c. 0.075 kg·m2 d. 0.064 kg·m2 Feedback The correct answer is: 0.16 kg·m2

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A fan blade, initially at rest, rotates with a constant acceleration of 0.036 rad/s2. What is its angular speed at the instant it goes through an angular displacement of 10 rad? Select one: a. 0.60 rad/s b. 2.68 rad/s c. 0.72 rad/s d. 0.36 rad/s e. 0.85 rad/s Correct Feedback The correct answer is: 0.85 rad/s Comments Make comment or override mark

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1300 rev/min is equivalent to which of the following? Select one: a. 60 rad/s b. 136 rad/s Correct c. 2600 rad/s d. 273 rad/s Feedback The correct answer is: 136 rad/s Comments Make comment or override mark

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A 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 4.0 rad/s2 over a 3.0-s interval? Select one: a. 40 rad b. 10.8 rad c. 36 rad d. 18 rad Correct e. 5.4 rad Feedback The correct answer is: 18 rad Comments Make comment or override mark

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A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 9 rad/s in 3 s. What is the average tangential acceleration of a point on the wheel's edge? Select one: a. 0.6 m/s2 Correct b. 45.0 m/s2

c. 1.2 m/s2 d. 1.8 m/s2 e. 27 m/s2 Feedback The correct answer is: 0.6 m/s2 Comments Make comment or override mark

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A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 35-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced? Select one: a. 10 cm Correct b. 20 cm c. 70 cm d. 30 cm Feedback The correct answer is: 10 cm Comments Make comment or override mark

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A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.20 m/s? Select one: a. 0.48 rev/s b. 0.64 rev/s Correct c. 1.5 rev/s d. 3.0 rev/s Feedback The correct answer is: 0.64 rev/s Comments Make comment or override mark

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A ventilation fan has blades 0.25 m in radius rotating at 30 rpm. What is the tangential speed of each blade tip? Select one: a. 20 m/s b. 0.79 m/s Correct c. 0.52 m/s d. 0.02 m/s Feedback The correct answer is: 0.79 m/s Comments Make comment or override mark

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Which of the first units given below can be units for angular acceleration while the second units can be units for angular velocity? Select one:

a. b. c. Correct d. Feedback The correct answer is: Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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A 0.40-m radius automobile tire accelerates from rest at a constant 4.0 rad/s2 over a 10.0 s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 10.0-s interval? Select one: a. 1.02 m/s2 b. 5.03 m/s2 c. 1.6 m/s2 Correct d. 10.05 m/s2

e. 3.2 m/s2 Feedback The correct answer is: 1.6 m/s2

PHYSICS LA 9

A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest? Select one: a. All go the same distance. b. the sphere c. the hoop d. the cylinder Feedback The correct answer is: the hoop Comments Comment: Make comment or override mark

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Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?

Select one: a. It is at a maximum. b. It is zero. c. It is downwards. d. It is upwards. Feedback The correct answer is: It is zero. Comments Comment: Make comment or override mark

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A Boeing-737 airliner has a mass of 20 300 kg. The total area of the wings is 105 m2. What must be the pressure difference between the top and bottom of the wings to keep the airplane up? Select one: a. 1 795 Pa b. 1 895 Pa Correct c. 193 Pa d. 20 Pa e. 1 905 Pa Feedback

The correct answer is: 1 895 Pa Comments Make comment or override mark

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9.4 Angular Momentum and Kepler's Second Law of Planetary Motion A 2.0-kg mass in the xy plane is moving in the negative x direction at 3.0 m/s along the line y = 5.0 m. As the mass passes across the y axis (i.e., passing the point (x, y = 0, 5.0 m)), what is its angular momentum with respect to the z axis? Select one: a. −30 SI units b. 30 SI units Correct c. 150 SI units d. −150 SI units Feedback The correct answer is: 30 SI units Comments Make comment or override mark

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An initially installed flywheel can store 106 J of kinetic energy when rotating at 300 rad/s. It is replaced by another flywheel of the same size but made of a stronger material. If its mass is the same as that of the original, and it is now capable of achieving a rotational speed of 445 rad/s, what maximum energy can be stored? Select one: a. 2.12E+5 J b. 1.00E+6 J c. 1.51E+3 J d. 2.20E+6 J Feedback The correct answer is: 2.20E+6 J

PHYSICS SQ 9 A centrifuge rotates at 100 rev/s (i.e., 628 rad/s). If the test tube places the suspension at 9.0 cm from the axis of rotation, by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity? Select one: a. 3.6 × 103 Correct b. 4.6 × 103 c. 5.7 × 105 d. 35.5 e. 362.2 Feedback The correct answer is: 3.6 × 103

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Water is sent from a fire hose at 25 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the water? Select one: a. 32 m b. 156 m c. 4 m d. 16 m e. 8 m Correct Feedback The correct answer is: 8 m Comments Make comment or override mark

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A uniform solid sphere rolls down an incline of height 3 m after starting from rest. In order to calculate its speed at the bottom of the incline, one needs to know: Select one: a. the mass and the radius of the sphere. b. no more than is given in the problem. Correct c. the mass of the sphere. d. the radius of the sphere. Feedback The correct answer is: no more than is given in the problem. Comments Make comment or override mark

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A cube of wood of density 0.78 g/cm3 is 10 cm on a side. When placed in water, what height of the block will float above the surface? (water density = 1.00 g/cm3) Select one:

a. 7.8 cm b. 1.2 cm c. 2.2 cm Correct d. 10 cm e. 3.2 cm Feedback The correct answer is: 2.2 cm Comments Make comment or override mark

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An ideal fluid flows through a pipe made of two sections with diameters of 1.0 and 4.0 inches, respectively. The speed of the fluid flow through the 4.0-inch section will be what factor times that through the 1.0-inch section? Select one: a. Correct b. 8 c. 16 d. 15 e. Feedback

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Question 6 Correct Mark 1.00 out of 1.00

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A solid sphere, a solid cylinder, and a hoop each have the same mass and radius. If they are spinning at the same angular velocity, which one has the greatest rotational kinetic energy? Select one: a. They all have the same rotational kinetic energy. b. the hoop Correct c. the sphere d. the cylinder Feedback The correct answer is: the hoop Comments Make comment or override mark

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A blimp is filled with 400 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.) Select one: a. 444 kg Correct b. 360 kg c. 516 kg d. 72 kg e. 588 kg Feedback The correct answer is: 444 kg Comments Make comment or override mark

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A hoop, solid sphere, and solid cylinder each have the same mass and same radius. When rolling down the same incline, which has the greatest torque from gravity on it?

Select one: a. the hoop b. the sphere c. the cylinder d. They all have the same torque. Correct Feedback The correct answer is: They all have the same torque. Comments Make comment or override mark

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What volume of water is displaced by a submerged 2.5-kg cylinder made of solid aluminum? (aluminum density = 2.7 × 103 kg/m3 and water density = 1.0 × 103 kg/m3) Select one: a. 0.9 × 103 m3 b. 9.3 × 10−4 m3 Correct c. 92.6 × 10−4 m3 d. 8.3 × 103 m3 e. 0.7 × 103 m3 Feedback The correct answer is: 9.3 × 10−4 m3

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9.4 Angular Momentum and Kepler's Second Law of Planetary Motion The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At the point closest to the Earth: Select one: a. the speed will be greatest although the angular speed will be the same. b. the angular speed will be greatest although the linear speed will be the same. c. the kinetic energy and angular momentum will both be greater. d. None of the above. Correct Feedback The correct answer is: None of the above

PHYSICS LA 10

11.2 Examples of Simple Harmonic Motion The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.120 m) cos (πt/16). What is the maximum net force on the mass as it oscillates?

Select one: a. 3.0 × 10−3 N Correct b. 4.7 N c. 0.98 × 10−3 N d. 7.4 × 10−3 N Feedback The correct answer is: 3.0 × 10−3 N Comments Make comment or override mark

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11.2 Examples of Simple Harmonic Motion By what factor should the length of a simple pendulum be changed if the period of vibration were to be quadrupled? Select one: a. 4.0 b. 1/16 c. 16 Correct d. 0.25 Feedback

The correct answer is: 16 Comments Make comment or override mark

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Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube. By what factor is the rate of heat flow changed when the bar's cross-sectional area is doubled? Select one: a. 1/4 b. 1/2 c. 2 Correct d. 4.0 Feedback The correct answer is: 2 Comments Make comment or override mark

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A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.6 cm between his core and skin. If his inner core is at the normal 98.6°F, and his skin has a surface area of 1.62 m2, what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 26.0°C? Select one: a. 125 W b. 321 W c. 325 W d. 200 W Correct e. 132 W Feedback The correct answer is: 200 W Comments Make comment or override mark

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Inside a house, stepping on a tile floor barefooted may feel almost cold, but stepping on carpet in an adjacent room feels comfortably warm. Why is this? Select one: a. It's because the thermal conductivity of carpet is less than that of tile. Correct b. It's because the thermal conductivity of tile is less than that of carpet. c. It's because the tile is at room temperature while carpet is normally warmer. d. It's because the tile is below room temperature while the carpet is at room temperature. Feedback The correct answer is: It's because the thermal conductivity of carpet is less than that of tile

PHYSICS SQ 10

. 11.1 General Features of Harmonic Motion The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (πt/16). What is its position at t = 6.0 s? Select one: a. 0.061 m Correct b. 0.089 m c. 0.159 m d. 0.160 m Feedback The correct answer is: 0.061 m Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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The emissivity of an ideal reflector has which of the following values? Select one: a. 100 b. 1 c. infinity d. 0 Correct Feedback The correct answer is: 0 Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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A solar heating system has a 25.0% conversion efficiency; the solar radiation incident on the panels is 950 W/m2. What is the increase in temperature of 26.0 kg of water in a 1.00-h period by a 3.00-m2-area collector? (cw = 4 186 J/kg⋅°C)

Select one: a. 17.7°C b. 7.9°C c. 23.6°C Correct d. 47.1°C e. 94.3°C Feedback The correct answer is: 23.6°C Comments Make comment or override mark

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11.2 Examples of Simple Harmonic Motion

What are the base SI units for the torsion constant Select one: a. Correct b. c.

?

d. Feedback The correct answer is: Comments Make comment or override mark

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The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process? Select one: a. conduction Correct b. vaporization c. radiation d. convection Feedback The correct answer is: conduction Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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Iced tea is made by adding ice to 1.7 kg of hot tea, initially at 80°C. How many kg of ice, initially at 0°C, are required to bring the mixture to 10°C? (Lf = 3.33 × 105 J/kg, cw = 4 186 J/kg⋅°C) Select one: a. 0.9 kg b. 1.5 kg c. 1.1 kg d. 1.7 kg e. 1.3 kg Correct Feedback The correct answer is: 1.3 kg Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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A puddle holds 190 g of water. If 1.1 g of water evaporates from the surface, what is the approximate temperature change of the remaining water? (Lv = 540 cal/g) Select one: a. −3.1 C° Correct b. +3.1 C° c. −0.31 C° d. +0.31 C° Feedback The correct answer is: −3.1 C° Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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11.2 Examples of Simple Harmonic Motion By what factor must one change the weight suspended vertically from a spring coil in order to double its period of simple harmonic motion? Select one: a. 2 b. 1/4 c. 4 Correct

d. 1/2 Feedback The correct answer is: 4 Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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Who demonstrated that when heat is gained or lost by a system during some process, the gain or loss can be accounted for by an equivalent quantity of mechanical work done on the system? Select one: a. Kelvin b. Boltzmann c. Joule Correct d. Thompson, Count Rumford Feedback The correct answer is: Joule Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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A 140-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 450 g of water. The water temperature rises from 10°C to 35°C. Given cCu = 0.10 cal/g⋅°C, and cwater = 1.00 cal/g⋅°C, what was the temperature of the kiln? Select one: a. 1,481°C b. 115°C c. 1,154°C d. 769°C e. 839°C Correct Feedback The correct answer is: 839°C

PHYSICS LA 11

Calories of the food type are equal to which of the following? Select one: a. 4.186 J b. 4 186 J Correct c. 1 BTU d. 1054 J

Feedback The correct answer is: 4 186 J Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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How many calories are equal to one BTU? (One calorie = 4.186 J, one BTU = 1 054 J.) Select one: a. 0.252 b. 252 Correct c. 3.97 d. 397 Feedback The correct answer is: 252 Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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11.1 General Features of Harmonic Motion The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (πt/8). What is its period of oscillation? Select one: a. 100 s b. 16 s Correct c. 32 s d. 8.0 s Feedback The correct answer is: 16 s Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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11.2 Examples of Simple Harmonic Motion

Three identical springs, each with spring constant k, are attached in parallel to a mass, which is then set into simple harmonic motion. What would be the spring constant of a single spring which would result in the same frequency of oscillation as the parallel springs? Select one: a. k b. 3k Correct c. d. k/3 Feedback The correct answer is: 3k Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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The inside of a house is at 20°C on an early morning when the temperature outside is 15°C. The next morning the inside temperature is the same but the outside temperature is now 10°C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one? Select one: a. The loss increases by 5/288 since we need to use the Kelvin scale for this calculation. b. The loss doubles. Correct c. The loss halves.

d. Since the inside temperature stays the same, the loss is the same both days. Feedback The correct answer is: The loss doubles.

PHYSICS SQ 11

An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 24°C to 95°C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg⋅°C) Select one: a. 89,000 J Correct b. 1,000 J c. 22,000 J d. 45,000 J e. 21 J Feedback The correct answer is: 89,000 J Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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A piece of copper of mass 160 g is being drilled through with a 1/2" electric drill. The drill operates at 25.0 W and takes 25.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. ccopper = 387 J/kg⋅°C. Select one: a. 20.2 C° b. 7.6 C° c. 15.2 C° d. 10.1 C° Correct e. 12.6 C° Feedback The correct answer is: 10.1 C° Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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A slice of bread contains about 150 kcal. If specific heat of a person were 1.00 kcal/kg⋅°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat? Select one: a. 1.07°C b. 2.14°C

Correct c. 2.68°C d. 1.61°C e. 4.29°C Feedback The correct answer is: 2.14°C Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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Marc attaches a falling 500-kg object with a rope through a pulley to a paddle wheel shaft. He places the system in a well-insulated tank holding 35 kg of water. When the object falls, it causes the paddle wheel to rotate and churn the water. If the object falls a vertical distance of 90 m at constant speed, what is the temperature change of the water? (1 kcal = 4 186 J, the specific heat of water is 4 186 J/kg⋅°C, and g = 9.8 m/s2) Select one: a. 6 C° b. 3,000 C° c. 3.0 C° Correct d. 0.6 C° e. 10,800 C° Feedback The correct answer is: 3.0 C°

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Question 5 Correct Mark 1.00 out of 1.00

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A 4-g lead bullet traveling in 20°C air at 290 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g⋅°C. The heat of fusion of lead is 24.5 J/g. Select one: a. 419°C b. 327°C Correct c. 349°C d. 262°C e. 175°C Feedback The correct answer is: 327°C Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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A machine gear consists of 0.1 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 28 C°? (Specific heats of iron and copper are 450 and 390 J/kg⋅°C, respectively.) Select one: a. 3,000 J Correct b. 1,300 J c. 3,300 J d. 2,800 J e. 1,700 J Feedback The correct answer is: 3,000 J Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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11.3 Harmonic Motion and Energy A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point? Select one: a. 0.57 m/s b. 1.6 m/s c. 0.80 m/s Correct d. 2.1 m/s Feedback The correct answer is: 0.80 m/s Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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11.2 Examples of Simple Harmonic Motion An object is attached to a spring, and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is nine times the original value. By what factor is the frequency of oscillation changed? Select one: a. 1/9

b. 1/3 Correct c. 3 d. 9 Feedback The correct answer is: 1/3 Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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11.3 Harmonic Motion and Energy I attach a 2.0-kg block to a spring that obeys Hooke's Law and supply 4.0 J of energy to stretch the spring. I release the block; it oscillates with period 0.30 s. The amplitude is: Select one: a. 9.5 cm. Correct b. 4.3 cm. c. 19 cm. d. 38 cm. Feedback The correct answer is: 9.5 cm. Comments

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Question 10 Correct Mark 1.00 out of 1.00

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11.3 Harmonic Motion and Energy A runaway railroad car, with mass 30 × 104 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 106 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.) Select one: a. 0.34 m b. 0.77 m c. 0.55 m Correct d. 1.07 m Feedback The correct answer is: 0.55 m

PHYSICS LONG QUIZ 3

An ideal fluid, of density 0.85 × 103 kg/m3, flows at 0.27 kg/s through a pipe of radius 0.018 m. What is the fluid speed? Select one: a. 1.16 m/s b. 3.09 m/s

c. 0.0028 m/s d. 265.26 m/s e. 0.31 m/s Correct Feedback The correct answer is: 0.31 m/s Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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11.1 General Features of Harmonic Motion A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of 8.0 cm. If a timer is started when its displacement from equilibrium is a maximum (hence x = 8 cm when t = 0), what is the displacement of the mass when t = 3.7 s? Select one: a. 0.049 m b. zero c. 0.080 m d. 0.025 m Correct Feedback The correct answer is: 0.025 m Comments

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Question 3 Correct Mark 1.00 out of 1.00

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If a nonzero torque is applied to an object, that object will experience: Select one: a. a constant angular speed. b. an angular acceleration. Correct c. an increasing moment of inertia. d. a constant moment of inertia. Feedback The correct answer is: an angular acceleration. Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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A box slides down a frictionless incline, and a hoop rolls down another incline. Both inclines have the same height, and both the box and the hoop have the same mass. If both objects start from rest, upon reaching the bottom of the incline which one will have the greater kinetic energy and which one will have the greater speed? Select one: a. Both will have the same kinetic energy, but the box will have the greater speed. Correct b. The box will have both the greater kinetic energy and the greater speed. c. The hoop will have both the greater kinetic energy and the greater speed. d. Both will have the same kinetic energy, but the hoop will have the greater speed. Feedback The correct answer is: Both will have the same kinetic energy, but the box will have the greater speed. Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 4g = 39.2 m/s2? Select one: a. 50.0 m

b. 72.7 m c. 89.9 m d. 70.6 m Correct Feedback The correct answer is: 70.6 m Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a 0.080-m radius cylinder at the top of a well. A crank with a turning radius of 0.5 m is attached to the end of the cylinder. What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope's mass is negligible, that the cylinder turns on frictionless bearings, and that g = 9.8 m/s2.) Select one: a. 1409 N b. 36 N Correct c. 451 N d. 9 N e. 4 N

Feedback The correct answer is: 36 N Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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In order to overcome a surface tension of a fluid, a force of 1.35 × 10−2 N is required to lift a wire ring of circumference 12.0 cm. What is the surface tension of the fluid? Select one: a. 0.056 N/m Correct b. 0.113 N/m c. 16.2 N/m d. 0.556 N/m e. 5.625 N/m Feedback The correct answer is: 0.056 N/m Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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The quantity "pressure" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to: Select one: a. M2L−1T−3. b. a dimensionless quantity. c. MLT−1. d. ML−1T−2. Correct Feedback The correct answer is: ML−1T−2. Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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A fan blade, initially at rest, rotates with a constant acceleration of 0.020 rad/s 2. What is the time interval required for it to reach a 8-rad displacement after starting from rest? Select one: a. 0.16 s b. 80 s c. 40 s d. 28 s Correct e. 20 s Feedback The correct answer is: 28 s Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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9.4 Angular Momentum and Kepler's Second Law of Planetary Motion The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points: Select one: a. the angular momenta are the same. Correct b. the angular velocities are the same.

c. the tangential velocities are the same. d. the kinetic energies are the same. Feedback The correct answer is: the angular momenta are the same. Comments Make comment or override mark

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Question 11 Correct Mark 1.00 out of 1.00

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A 3.0-kg mass is placed at (4.0, 5.0) m, and a 6.0-kg mass is placed at (4.0, −5.0) m. What is the moment of inertia of this system of masses about the z axis? Select one: a. 144 kg·m2 b. 36 kg·m2 c. 45 kg·m2 d. 369 kg·m2 Correct e. 225 kg·m2 Feedback The correct answer is: 369 kg·m2 Comments Make comment or override mark

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Question 12 Correct Mark 1.00 out of 1.00

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A woman who weighs 500 N stands on an 8.0 m long board that weighs 100 N. The board is supported at each end. The support force at the right end is 2 times the support force at the left end. How far from the right end is the woman standing? Select one: a. 2.4 m b. 4.0 m c. 1.6 m Correct d. 2.7 m Feedback The correct answer is: 1.6 m Comments Make comment or override mark

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Question 13 Correct Mark 1.00 out of 1.00

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A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.60 m long and each ball on the end is 0.10 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis formed by one of the batons? Select one: a. 0.036 kg·m2 b. 0.054 kg·m2 c. 0.06 kg·m2 d. 0.018 kg·m2 Correct e. 0.12 kg·m2 Feedback The correct answer is: 0.018 kg·m2 Comments Make comment or override mark

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Question 14 Correct Mark 1.00 out of 1.00

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If one's hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process? Select one:

a. convection b. conduction c. radiation Correct d. vaporization Feedback The correct answer is: radiation Comments Make comment or override mark

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Question 15 Correct Mark 1.00 out of 1.00

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A 4.0-kg mass is placed at (3.0, 4.0) m, and a 7.0 kg-mass is placed at (3.0, −4.0) m. What is the moment of inertia of this system of masses about the z axis? Select one: a. 180 kg·m2 b. 275 kg·m2 Correct c. 90 kg·m2 d. 250 kg·m2 Feedback The correct answer is: 275 kg·m2

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Question 16 Correct Mark 1.00 out of 1.00

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A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 24 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration? Select one: a. 1.1 N·m b. 11 N·m c. 1.4 N·m d. 2.9 N·m Correct Feedback The correct answer is: 2.9 N·m Comments Make comment or override mark

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Question 17 Correct Mark 1.00 out of 1.00

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A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 4.0-s interval at a rate of 0.10 rad/s2. What angular displacement does the Ferris wheel undergo in this 7.00-s interval? Select one: a. 2.20 rad b. 3.60 rad c. 0.80 rad d. 2.80 rad Correct e. 2.40 rad Feedback The correct answer is: 2.80 rad Comments Make comment or override mark

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Question 18 Correct Mark 1.00 out of 1.00

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The Garfield Thomas water tunnel at Pennsylvania State University has a circular cross-section that constricts from a diameter of 3.6 m to the test section, which is 1.2 m in diameter. If the speed of flow is 4.0 m/s in the large-diameter pipe, determine the speed of flow in the test section. Select one: a. 5 m/s b. 38 m/s c. 36 m/s Correct d. 0.4 m/s e. 4 m/s Feedback The correct answer is: 36 m/s Comments Make comment or override mark

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Question 19 Correct Mark 1.00 out of 1.00

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The condition for onset of turbulent flow is that the Reynolds Number reaches what value? Select one: a. 2 000 b. 1 000 c. 3 000 Correct

d. 4 000 Feedback The correct answer is: 3 000 Comments Make comment or override mark

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Question 20 Correct Mark 1.00 out of 1.00

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A 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 3.0 rad/s2 over a 5.0-s interval? Select one: a. 37 rad Correct b. 0.50 rad c. 25 rad d. 12 rad Feedback The correct answer is: 37 rad Comments Make comment or override mark

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Question 21 Correct Mark 1.00 out of 1.00

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Water (density = 1 × 103 kg/m3) flows at 15.5 m/s through a pipe with radius 0.040 m.The pipe goes up to the second floor of the building, 3.5 m higher, and the pressure remains unchanged. What is the speed of the water flow in the pipe on the second floor? Select one: a. 7 m/s b. 18 m/s c. 13 m/s Correct d. 14 m/s e. 172 m/s Feedback The correct answer is: 13 m/s Comments Make comment or override mark

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Question 22 Correct Mark 1.00 out of 1.00

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Two hoops or rings (I = MR2) are centered, lying on a turntable. The smaller ring has radius = 0.05 m; the larger has radius = 0.1 m. Both have a mass of 5.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable. Select one: a. 0.0125 kg·m2 b. 0.75 kg·m2 c. 0.1125 kg·m2 d. 0.0625 kg·m2 Correct e. 0.05 kg·m2 Feedback The correct answer is: 0.0625 kg·m2 Comments Make comment or override mark

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Question 23 Correct Mark 1.00 out of 1.00

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A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 5-cm and 70-cm marks, respectively. Where should Doug hang a third mass of 0.20 kg to keep the stick balanced?

Select one: a. 10 cm b. 50 cm c. 20 cm d. 80 cm Correct e. 90 cm Feedback The correct answer is: 80 cm Comments Make comment or override mark

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Question 24 Correct Mark 1.00 out of 1.00

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9.4 Angular Momentum and Kepler's Second Law of Planetary Motion An astronomical unit (AU) is the average distance from the Earth to the Sun. An comet in orbit around the Sun has a perihelion (near point to the Sun) of 0.50 AU and an aphelion (far point from the Sun) of 5.0 AU. If the comet's orbital speed at aphelion is v, what is its speed at perihelion? Select one: a. 5.5v b. 4.5v c. 11v d. 10v Correct

Feedback The correct answer is: 10v Comments Make comment or override mark

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Question 25 Correct Mark 1.00 out of 1.00

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11.4 Stress, Strain, and Hooke's Law

A 2.0 cm 2.0 cm steel rod of length 80 cm has its left end clamped and a force of applied perpendicular to its length at its right end. By how much does the right end shift from its original position? For steel Young's modulus is Select one: a. b. More information is needed. c. d. Correct Feedback The correct answer is: Comments Make comment or override mark

, the bulk modulus is

, and the shear modulus is

.

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Question 26 Correct Mark 1.00 out of 1.00

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A spool of thread has an average radius of 1.00 cm. If the spool contains 126 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers. Select one: a. 62,800 b. 2000 Correct c. 1000 d. 100 Feedback The correct answer is: 2000 Comments Make comment or override mark

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Question 27 Correct Mark 1.00 out of 1.00

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A solid object is made of two materials, one material having density of 2 500 kg/m3 and the other having density of 5 500 kg/m3. If the object contains equal masses of the materials, what is its average density? Select one: a. 8 000 kg/m3 b. 4 438 kg/m3 Incorrect c. 4 000 kg/m3 d. 3 438 kg/m3 e. more information is needed Feedback The correct answer is: 3 438 kg/m3 Comments Comment: Make comment or override mark

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Question 28 Correct Mark 1.00 out of 1.00

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A uniform rod of length L and weight W is placed on a fulcrum a distance of 0.2L from the left end. On the left end is placed a mass of weight 3W and on the right end a vertical force F is applied to keep the system in balance. What are the magnitude and direction of the force F? Select one: a.

W, up

b.

W, down

c. W, up Incorrect d. 0.6W, down e.

W, down

Feedback The correct answer is:

W, down

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Question 29 Correct Mark 1.00 out of 1.00

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Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1. How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)

Select one: a. 16 b. 8 Correct c. 2 d. 4 Feedback The correct answer is: 8 Comments Make comment or override mark

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Question 30 Correct Mark 1.00 out of 1.00

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A fountain sends water to a height of 100 m. What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2) Select one: a. 1 atm b. 10.8 atm c. 0.1 atm d. 9.8 atm Correct e. 44.3 atm Feedback The correct answer is: 9.8 atm

PHYSICS LA 12

When considering human metabolism in terms of the 1st Law of Thermodynamics, which of the following represents the metabolic rate? Select one: a. ΔQ / Δt b. ΔW / Δt c. W / Δt d. ΔU / Δt Correct Feedback The correct answer is: ΔU / Δt Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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On a P-V diagram, an ____ process is represented by a horizontal line. Select one: a. isothermal b. isobaric

c. adiabatic d. isovolumetric Feedback The correct answer is: isobaric Comments Comment: Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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12.8 Standing Waves A C note (f = 128 Hz) is sounded on a piano. If the length of the piano wire is 1.00 m and its mass density is 5.00 g/m, what is the tension in the wire? Select one: a. 84 N b. 328 N Correct c. 1310 N d. 655 N Feedback The correct answer is: 328 N Comments

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Question 4 Correct Mark 1.00 out of 1.00

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The efficiency of a Carnot engine operating between 97°C and 0°C is most nearly: Select one: a. 52%. b. 80%. c. 9%. d. 13%. e. 26%. Correct Feedback The correct answer is: 26%. Comments Make comment or override mark

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Question 5

Correct Mark 1.00 out of 1.00

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12.8 Standing Waves The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.0-m long string is 151 N and one-half wavelength occupies the string, what is the mass of the string? Select one: a. 100 g b. 37 g c. 25 g Correct d. 50 g Feedback The correct answer is: 25 g

PHYSICS SQ 12

An electrical generating plant operates at a boiler temperature of 223°C and exhausts the unused heat into a nearby river at 20°C. If the generating plant has a power output of 890 megawatts (MW) and if the actual efficiency is 3/4 the theoretical efficiency, how much heat per second must be delivered to the boiler? (0°C = 273 K) Select one: a. 2,899 MW b. 8,698 MW c. 4,349 MW d. 2,175 MW e. 1,713 MW Feedback The correct answer is: 2,899 MW Comments Comment:

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Question 2 Correct Mark 1.00 out of 1.00

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A 4-mol ideal gas system undergoes an adiabatic process where it expands and does 24 J of work on its environment. How much heat is received by the system? Select one: a. zero b. +6 J c. −6 J d. −24 J e. +24 J Feedback The correct answer is: zero Comments Comment: Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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12.3 Examples of Waves A string is strung horizontally with a fixed tension. A wave of frequency 100 Hz is sent along the string, and it has a wave speed of 100 m/s. Then a second wave, one of frequency 200 Hz, is sent along the string. What is the wave speed of the second wave? Select one: a. 70.7 m/s b. 25.0 m/s c. 100 m/s Correct d. 50.0 m/s Feedback The correct answer is: 100 m/s Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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What is the change in entropy (ΔS) when one mole of silver (108 g) is completely melted at 966°C? (The heat of fusion of silver is 8.82 × 104 J/kg.) Select one: a. 5.69 J/K b. 15.38 J/K c. 9.86 J/K d. 7.69 J/K e. 3.84 J/K Feedback The correct answer is: 7.69 J/K Comments Comment: Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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When gasoline is burned, it gives off 43,000 J/g of heat energy. If an automobile uses 12.6 kg of gasoline per hour with an efficiency of 23%, what is the average horsepower output of the engine? (1 hp = 746 W) Select one: a. 56 hp b. 46 hp

Correct c. 110 hp d. 37 hp e. 28 hp Feedback The correct answer is: 46 hp Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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A heat engine exhausts 3,700 J of heat while performing 1,700 J of useful work. What is the efficiency of the engine? Select one: a. 16% b. 69% c. 31% Correct d. 84% e. 50% Feedback The correct answer is: 31% Comments

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Question 7 Correct Mark 1.00 out of 1.00

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Entropy is a measure of the ____ of a system. Select one: a. disorder b. heat c. temperature d. internal energy Feedback The correct answer is: disorder Comments Comment: Make comment or override mark

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Question 8 Correct

Mark 1.00 out of 1.00

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How many nodes does a standing wave in a string have at the frequency of the sixth harmonic? Select one: a. 6 b. 12 c. 3 d. The answer is not given. Correct Feedback The correct answer is: The answer is not given. Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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A quantity of monatomic ideal gas expands adiabatically from a volume of 2.2 liters to 7 liters. If the initial pressure is P0, what is the final pressure? Select one: a. 6.88 P0 b. 0.29 P0 c. 3.18 P0 d. 0.15 P0

e. 6.36 P0 Feedback The correct answer is: 0.15 P0 Comments Comment: Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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The Carnot cycle consists of a combination of ____ and ____ processes. Select one: a. adiabatic, isothermal b. isobaric, isovolumetric c. isovolumetric, adiabatic d. isobaric, isothermal Feedback The correct answer is: adiabatic, isothermal

PHYSICS LA 13

By what factor should the length of a simple pendulum be changed if the period of vibration were to be five times?

Select one: a. 5 b. 25 c. 0.2 d. 1.0 e. 1/25 Feedback The correct answer is: 25 Comments Comment: Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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13.2 Amplitude and Intensity of a Sound Wave Doubling the power output from a speaker emitting a single frequency will result in what increase in loudness? Select one: a. 0.33 dB b. 9.0 dB c. 3.0 dB Correct

d. 4.8 dB Feedback The correct answer is: 3.0 dB Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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13.3 Standing Sound Waves A flute behaves like a tube open at both ends. If its length is 70.0 cm, and the speed of sound is 340 m/s, what is its fundamental frequency in Hz? Select one: a. 260 Hz b. 159 Hz c. 243 Hz d. 121 Hz Feedback The correct answer is: 243 Hz Comments Comment: Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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A sound intensity of 70 dB is observed at a distance d from the source of sound. What sound intensity would be observed at a distance 2d from the source? Select one: a. 64 dB b. 67 dB d. 68 dB Feedback The correct answer is: 64 dB Comments Comment: Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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13.1 Sound Is a Longitudinal Wave The density of a certain solid is 7.2 × 103 kg/m3, and its Young's modulus is 8.0 × 1010 N/m2. What is the speed of sound in this material? Select one: a. 1.1 × 107 m/s b. 5900 m/s c. 3300 m/s d. 3700 m/s Feedback The correct answer is: 3300 m/s

PHYSICS SQ 13

A runaway railroad car, with mass 24 × 104 kg, coasts across a level track at 2.7 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 2.7 × 106 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)

Select one: a. 0.57 m b. 1.14 m c. 0.8 m Correct d. 1.53 m e. 1.61 m Feedback The correct answer is: 0.8 m Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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13.1 Sound Is a Longitudinal Wave A sound wave coming from a tuba has a wavelength of 0.674 m and travels to your ears at a speed of 345 m/s. What is the frequency of the sound you hear? Select one: a. 1/230 Hz b. 230 Hz c. 1/517 Hz d. 512 Hz Correct Feedback The correct answer is: 512 Hz Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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13.3 Standing Sound Waves A phase difference of 480° corresponds to what wavelength difference? Select one: a. 3λ b. 3λ/2 c. 4λ/3 Correct d. 3λ/4 Feedback The correct answer is: 4λ/3 Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1 000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment? Select one: a. helium b. carbon dioxide

c. They all have the same frequency of sound. Correct d. oxygen Feedback The correct answer is: They all have the same frequency of sound. Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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A long string is pulled so that the tension in it increases by a factor of three. If the change in length is negligible, by what factor does the wave speed change? Select one: a. 0.58 b. 0.82 c. 0.33 d. 1.73 Correct e. 3.0 Feedback The correct answer is: 1.73 Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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Consider the curve f(x) = A cos(2πx/λ). The wavelength of the wave will be:

Select one: a. the distance x2 to x3. b. the distance 0 to A. c. twice the distance 0 to A. d. twice the distance x2 to x3. Correct Feedback The correct answer is: twice the distance x2 to x3. Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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A tiny spring, with a spring constant of 1.2 N/m, will be stretched to what displacement by a 0.0055-N force? Select one: a. 9.2 mm b. 3.3 mm c. 13.8 mm d. 4.6 mm Correct e. 6.6 mm Feedback The correct answer is: 4.6 mm Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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A 0.22-kg object is oscillating on a spring with a spring constant of k = 18 N/m. What is the potential energy of the system when the object displacement is 0.051 m, exactly half the maximum amplitude? Select one: a. 0.023 J Correct

b. 0.459 J c. 0.047 0 J d. zero e. 9 J Feedback The correct answer is: 0.023 J Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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Two springs, each with spring constant k, are attached end to end in a series fashion. A second pair of identical springs are also attached in series fashion. Then the pair of series attached springs are attached in parallel to each other. What is the effective spring constant of the resulting combination of springs? Select one: a. either k/4 or 4k b. k/2 c. k Correct d. 2k Feedback The correct answer is: k Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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Triple the mass per unit length of a guitar string will result in changing the wave speed in the string by what factor? Select one: a. 1.73 b. 1.00 (i.e., no change) c. 0.58 Correct d. 3.00 e. 3.46 Feedback The correct answer is: 0.58

PHYSICS LA 14

A sound wave coming from a tuba has a wavelength of 1.5 m and travels to your ears at a speed of 360 m/s. What is the frequency of the sound you hear? Select one: a. 358.5 Hz b. 240 Hz Correct

c. 1/540 Hz d. 540 Hz e. 1/240 Hz Feedback The correct answer is: 240 Hz Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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The Doppler shift of ultrasonic waves can measure the speed of blood in an artery. If the frequency of the stationary source is 105 kHz and the reflected sound has a Doppler shift of 180 Hz, what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s.) Select one: a. 2.6 m/s b. 1 m/s c. 1.3 m/s Correct d. 5.9 m/s e. 4.3 m/s Feedback The correct answer is: 1.3 m/s Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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14.4 Phases of Matter and Phase Changes A 6-g lead bullet traveling in 20°C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327°C. The specific heat of lead is 0.128 J/g·°C. The heat of fusion of lead is 24.5 J/g. Select one: a. 327°C Correct b. 293°C c. 227°C d. 260°C Feedback The correct answer is: 327°C Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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14.6 Heat Conduction A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 32 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100°C and 20°C, at what rate will heat be transferred between it ends? Select one: a. 16 J/s b. 4 J/s c. 8 J/s Correct d. 32 J/s Feedback The correct answer is: 8 J/s Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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An airplane flying with a constant speed flies from a warm air mass into a cold air mass. The Mach number will: Select one: a. stay the same.

b. increase. Correct c. become unstable. d. decrease. Feedback The correct answer is: increase.

PHYSICS SQ 14

When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.) Select one: a. Any of the above could be true. b. It is open at one end and closed at the other end. Correct c. It is closed at both ends. d. It is open at both ends. Feedback The correct answer is: It is open at one end and closed at the other end. Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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A sound source of frequency 1,010 Hz moves at 50 m/s toward a listener who is at rest. What is the apparent frequency heard by the listener? (speed of sound = 340 m/s) Select one: a. 751 Hz b. 1,159 Hz c. 1,180 Hz Correct d. 880 Hz e. 861 Hz Feedback The correct answer is: 1,180 Hz Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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Which of the following ranges corresponds to the longest wavelengths? Select one: a. ultrasonic b. all have the same wavelengths c. audible d. infrasonic Correct

Feedback The correct answer is: infrasonic Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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If I double the mass per unit length of guitar string, its natural frequency changes by what factor? Select one: a. 0.71 Correct b. 1.41 c. 2 d. 1 e. 4 Feedback The correct answer is: 0.71 Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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A standing wave is set up in a 5-m string fixed at both ends. The string vibrates in 8 distinct segments when driven by a 140-Hz source. In how many distinct standing wave segments will the string vibrate if the tension is increased by a factor of 5? Select one: a. 88 b. No standing wave pattern occurs. Correct c. 40 d. 20 e. 3 Feedback The correct answer is: No standing wave pattern occurs. Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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A child sits on a swing supported by ropes of length 4 m. With what frequency will she need to apply the driving force to maintain swinging? Select one: a. 1.74 Hz b. 5.44 Hz c. 0.50 Hz d. 0.25 Hz Correct e. 4.01 Hz Feedback The correct answer is: 0.25 Hz Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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14.4 Phases of Matter and Phase Changes A slice of bread contains about 90 kcal. If specific heat of a person were 1.00 kcal/kg·°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat? Select one: a. 1.29°C Correct b. 1.86°C

c. 1.43°C d. 2.25°C Feedback The correct answer is: 1.29°C Comments Make comment or override mark

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In which part of the ear is the cochlea? Select one: a. ear canal b. outer ear c. middle ear d. inner ear Correct Feedback The correct answer is: inner ear Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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A train station bell gives off a fundamental tone of 530 Hz as the train approaches the station at a speed of 23 m/s. If the speed of sound in air is 346 m/s, what will be the apparent frequency of the bell to an observer riding the train? Select one: a. 495 Hz b. 565 Hz Correct c. 553 Hz d. 346 Hz e. 241 Hz Feedback The correct answer is: 565 Hz Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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14.5 Thermal Expansion As a copper wire is heated, its length increases by 0.200%. What is the change of the temperature of the wire? (αCu = 16.6 × 10−6/C°) Select one: a. 6.0°C b. 60.2°C c. 120°C Correct d. 30.1°C Feedback The correct answer is: 120°C

PHYSICS LONG QUIZ 4

For a standing wave on a string the wavelength must equal: Select one: a. the distance between supports. b. the distance between adjacent nodes. c. twice the distance between adjacent nodes. Correct d. the distance between adjacent antinodes. Feedback The correct answer is: twice the distance between adjacent nodes. Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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13.2 Amplitude and Intensity of a Sound Wave In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given point every minute. Late at night, the traffic flow is only 8 cars per minute. What is the late-night decibel level? Select one: a. 74 dB b. 77 dB c. 69 dB Correct d. 70 dB Feedback The correct answer is: 69 dB Comments Make comment or override mark

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Question 3 Correct Mark 1.00 out of 1.00

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In the afternoon, the decibel level of a busy freeway is 89 dB with 90 cars passing a given point every minute. Late at night, the traffic flow is only 5 cars per minute. What is the late-night decibel level? Select one: a. 205 dB b. 9 dB c. 176 dB d. 89 dB e. 76 dB Correct Feedback The correct answer is: 76 dB Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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13.3 Standing Sound Waves What is the next harmonic frequency over the fundamental for an organ pipe 1.50 m in length, closed at one end? The speed of sound in air is 340 m/s. Select one: a. 56.7 Hz b. 170 Hz Correct

c. 227 Hz d. 113 Hz Feedback The correct answer is: 170 Hz Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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12.3 Examples of Waves A long string is pulled so that the tension in it increases by a factor of four. If the change in length is negligible, by what factor does the wave speed change? Select one: a. 2.0 Correct b. 0.25 c. 4.0 d. 0.50 Feedback The correct answer is: 2.0 Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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The term "timbre" refers to which of the following? Select one: a. Instruments that have valves. b. An instrument made in France. c. The quality of sound from instruments due to the mixture of harmonics. Correct d. Any musical instrument made primarily of wood. Feedback The correct answer is: The quality of sound from instruments due to the mixture of harmonics. Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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12.8 Standing Waves

A 1.5-m string is held fixed at both ends. When driven by a 180-Hz source, the string vibrates in 3 distinct segments. What is the natural fundamental frequency of the string? Select one: a. 540 Hz b. 30 Hz c. 90 Hz d. 60 Hz Correct Feedback The correct answer is: 60 Hz Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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Spring #1 has spring constant 80 N/m. Spring #2 has an unknown spring constant, but when connected in series with Spring #1, the connected springs have an effective force constant of 20 N/m. What is the spring constant for Spring #2? Select one: a. 16 N/m b. 100 N/m c. 60 N/m d. 90 N/m e. 27 N/m

Correct Feedback The correct answer is: 27 N/m Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions? Select one: a. It is always negative. b. counterclockwise c. It is always positive. d. clockwise Correct Feedback The correct answer is: clockwise Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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A very loud train whistle has an acoustic power output of 96 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 96 meters from the train? (I0 = 10−12 W/m2) Select one: a. 69 dB b. 205 dB c. 89 dB Correct d. 94 dB e. 21 dB Feedback The correct answer is: 89 dB Comments Make comment or override mark

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Question 11 Correct Mark 1.00 out of 1.00

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Which of the following choices best corresponds to what is required by the second law of thermodynamics for any process taking place in an isolated system? Select one: a. entropy equals work done on the system b. entropy increases c. entropy remains constant d. entropy decreases Incorrect Feedback The correct answer is: entropy increases Comments Comment: Make comment or override mark

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Question 12 Correct Mark 1.00 out of 1.00

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A car with bad shocks bounces up and down with a period of 1.78 s after hitting a bump. The car has a mass of 1,400 kg and is supported by four springs of force constant k. What is k for each spring? Select one: a. 1,235 N/m b. 2,181 N/m c. 4,361 N/m

Correct d. 658 N/m e. 1,090 N/m Feedback The correct answer is: 4,361 N/m Comments Make comment or override mark

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Question 13 Correct Mark 1.00 out of 1.00

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Of the frequencies listed below, to which one is the human ear most sensitive? Select one: a. 33 000 Hz Incorrect b. 330 Hz c. 33 Hz d. 3 300 Hz Feedback The correct answer is: 3 300 Hz Comments Comment: Make comment or override mark

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Question 14 Correct Mark 1.00 out of 1.00

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14.5 Thermal Expansion An automobile gas tank is filled to its capacity of 20.00 gallons with the gasoline at an initial temperature of 10°C. The automobile is parked in the Sun causing the gasoline's temperature to rise to 60°C. If the coefficient of volume expansion for gasoline is 9.6 × 10−4/°C, what volume runs out the overflow tube? Assume the change in volume of the tank is negligible. Select one: a. 1.74 gallons b. 0.30 gallon c. 0.72 gallon d. 0.96 gallon Correct Feedback The correct answer is: 0.96 gallon Comments Make comment or override mark

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Question 15 Correct Mark 1.00 out of 1.00

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14.4 Phases of Matter and Phase Changes How much heat energy must be removed from 150 g of oxygen at 22°C to liquefy it at −183°C? (The specific heat of oxygen gas is 0.218 cal/g·°C, and its heat of vaporization is 50.9 cal/g.) Select one: a. 9560 cal b. 2160 cal c. 4320 cal d. 14,300 cal Correct Feedback The correct answer is: 14,300 cal Comments Make comment or override mark

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Question 16 Correct Mark 1.00 out of 1.00

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A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one. Select one: a. It is at a higher frequency than the original one.

Correct b. More than one answer is correct. c. It is at a lower frequency than the original one. d. It is the same since the posts don't move. Feedback The correct answer is: It is at a higher frequency than the original one. Comments Make comment or override mark

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Question 17 Correct Mark 1.00 out of 1.00

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In an isovolumetric process where the pressure increases, are the heat absorbed, work done by the system, and the change in internal energy of the system positive, negative, or zero? Select one: a. Q is +, W is 0, and ΔU is +. Correct b. Q is +, W is −, and ΔU is 0. c. Q is −, W is 0, and ΔU is −. d. Q is +, W is +, and ΔU is +. Feedback The correct answer is: Q is +, W is 0, and ΔU is +. Comments Make comment or override mark

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Question 18 Correct Mark 1.00 out of 1.00

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12.6 Reflection A radar pulse is bounced off the Moon at a distance of 400,000 km. What is the time from the transmitting of the pulse until its return? Select one: a. 2.67 s Correct b. 3.84 s c. 2.56 s d. 1.28 s Feedback The correct answer is: 2.67 s Comments Make comment or override mark

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Question 19 Correct Mark 1.00 out of 1.00

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12.2 Describing Waves Waves propagate at 4.0 m/s along a stretched string. The end of the string is vibrated up and down once every 3.0 s. What is the wavelength of the waves that travel along the string? Select one: a. 12 m Correct b. 2.7 m c. 3.0 m d. 6.0 m Feedback The correct answer is: 12 m Comments Make comment or override mark

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Question 20 Correct Mark 1.00 out of 1.00

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Standing waves can result from _____ waves. Select one: a. longitudinal b. neither longitudinal nor transverse c. transverse d. both longitudinal and transverse Correct

Feedback The correct answer is: both longitudinal and transverse Comments Make comment or override mark

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Question 21 Correct Mark 1.00 out of 1.00

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If one could transport a simple pendulum of constant length from the Earth's surface to the Moon's, where the acceleration due to gravity is one-sixth (1/6) that on the Earth, by what factor would the pendulum frequency be changed? Select one: a. about 0.41 Correct b. about 2.5 c. about 0.17 d. about 6.0 Feedback The correct answer is: about 0.41 Comments Make comment or override mark

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Question 22 Correct Mark 1.00 out of 1.00

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13.2 Amplitude and Intensity of a Sound Wave Which of the following best describes a sound level of intensity 10-6 W/m2? Select one: a. like a whisper b. normal conversation Correct c. extremely loud d. about that of a power mower Feedback The correct answer is: normal conversation Comments Make comment or override mark

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Question 23 Correct Mark 1.00 out of 1.00

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An object is attached to a spring and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is three times the original value. By what factor is the frequency of oscillation changed? Select one: a. 3 b. 0.58 Correct c. 1/3 d. 9 e. 1/9 Feedback The correct answer is: 0.58 Comments Make comment or override mark

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Question 24 Correct Mark 1.00 out of 1.00

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Quadrupling the tension in a guitar string will change its natural frequency by what factor? Select one: a. 2.0 Correct b. 1.4 c. 16 d. 1

e. 4 Feedback The correct answer is: 2.0 Comments Make comment or override mark

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Question 25 Correct Mark 1.00 out of 1.00

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Which of the following has the highest specific heat? Select one: a. steam b. ice c. They are all water, so they all have the same specific heat. d. water Correct Feedback The correct answer is: water Comments Make comment or override mark

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Question 26 Correct Mark 1.00 out of 1.00

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By what amount does the sound intensity decrease when the distance to the source triples? Select one: a. 0.11 dB b. 1.9 dB c. 9 dB d. 10 dB Correct e. 3 dB Feedback The correct answer is: 10 dB Comments Make comment or override mark

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Question 27 Correct Mark 1.00 out of 1.00

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On a PV diagram, 2 curves are plotted, both starting at the same point (P1, V1) and both ending at the same increased volume (V2). One curve is for an isothermal process; the other is for an adiabatic process. Except for the common starting point, which curve is the upper one? Select one: a. Since they start at the same point and end at the same volume, they will coincide. b. The isothermal one will start out higher, but the adiabatic one will eventually cross it. c. The adiabatic process curve will always be the upper one. d. The isothermal process curve will always be the upper one. Correct Feedback The correct answer is: The isothermal process curve will always be the upper one. Comments Make comment or override mark

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Question 28 Correct Mark 1.00 out of 1.00

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System 1 is 2.9 moles of a monatomic ideal gas held at a constant volume as it undergoes a temperature increase. System 2 is 2.9 moles of a diatomic ideal gas held at constant volume as it also undergoes a temperature increase. The thermal energy absorbed by System 1 is absorbed by System 2 is ratio

, and the thermal energy

as both systems undergo a temperature increase of 74.9 K. What is the

?

Select one: a. The volumes of the systems need to be known before the ratio can be found.

b. 0.60 Correct c. 1.00 d. 1.67 e. 2.50 Feedback The correct answer is: 0.60 Comments Make comment or override mark

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Question 29 Correct Mark 1.00 out of 1.00

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If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas: Select one: a. volume increases. Correct b. pressure increases. c. internal energy decreases. d. temperature increases. Feedback The correct answer is: volume increases. Comments Make comment or override mark

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Question 30 Correct Mark 1.00 out of 1.00

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13.5 Reflection and Scattering of Sound 13.6 The Doppler Effect Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 540 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s) Select one: a. 463 Hz b. 540 Hz Correct c. 500 Hz d. 579 Hz Feedback The correct answer is: 540 Hz

PHYSICS SECOND QUARTER EXAM

A rotating flywheel can be used as a method to store energy. If it has 2.0 × 106 J of kinetic energy when rotating at 350 rad/s, and if a frictional torque of 4.0 N would the flywheel come to rest? Select one: a. 2 860 min

m acts on the system, in what interval of time

b. 47.6 min Correct c. 32.7 min d. 190 min Feedback The correct answer is: 47.6 min Comments Make comment or override mark

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Question 2 Correct Mark 1.00 out of 1.00

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The bottom of a flat-bottomed aluminum boat has an area of 4.3 m2 and the boat's mass is 64 kg. When set afloat in water, how far below the water surface is the boat bottom? (water density = 1.0 × 103 kg/m3) Select one: a. 0.025 m b. 0.115 m c. 0.275 m d. 0.015 m Correct e. 15 m Feedback The correct answer is: 0.015 m Comments

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Question 3 Correct Mark 1.00 out of 1.00

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Sea breezes that occur near the shore are attributed to a difference between land and water with respect to what property? Select one: a. emissivity b. coefficient of volume expansion c. mass density d. specific heat Correct Feedback The correct answer is: specific heat Comments Make comment or override mark

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Question 4 Correct Mark 1.00 out of 1.00

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A source of sound has an intensity I1 and when its sound level is measured at a fixed distance the value found is 70 dB. The source then has its intensity increased to I2 and when its sound level is measured at the same distance the value found is 96 dB. What is the ratio I2/I1? Select one: a. 400 Correct b. 26 c. 600 d. 14 Feedback The correct answer is: 400 Comments Make comment or override mark

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Question 5 Correct Mark 1.00 out of 1.00

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If it takes 7 N to stretch a spring 6 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 3 cm? Select one: a. 21 N b. 7 N Correct

c. 3.5 N d. 28 N e. 14 N Feedback The correct answer is: 7 N Comments Make comment or override mark

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Question 6 Correct Mark 1.00 out of 1.00

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An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is: Select one: a. 0.5I2/L. b. 0.5L2/I. Correct c. 0.5I2/m. d. 0.5L2/m. Feedback The correct answer is: 0.5L2/I. Comments Make comment or override mark

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Question 7 Correct Mark 1.00 out of 1.00

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13.3 Standing Sound Waves What is the lowest frequency that will resonate in an organ pipe 1.00 m in length, closed at one end? The speed of sound in air is 340 m/s. Select one: a. 680 Hz b. 42.5 Hz c. 85.0 Hz Correct d. 170 Hz Feedback The correct answer is: 85.0 Hz Comments Make comment or override mark

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Question 8 Correct Mark 1.00 out of 1.00

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If the distance between a point sound source and a dB detector is increased by a factor of 5, what will be the reduction in intensity level? Select one: a. 0.04 dB b. 0.20 dB c. 26 dB d. 14 dB Correct e. 5 dB Feedback The correct answer is: 14 dB Comments Make comment or override mark

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Question 9 Correct Mark 1.00 out of 1.00

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If two adjacent frequencies of an organ pipe closed at one end are 515 Hz and 625 Hz, what is the length of the organ pipe? (vsound = 340 m/s) Select one: a. 0.8 m b. 1.2 m c. 1.5 m Correct

d. 1.0 m e. 3.1 m Feedback The correct answer is: 1.5 m Comments Make comment or override mark

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Question 10 Correct Mark 1.00 out of 1.00

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A buzzer with frequency f0 is thrown straight upwards. On the buzzer's trip down, what is the frequency behavior heard by an observer below? Select one: a. The frequency is a constant one greater than f0. b. The frequency heard is still f0. c. The frequency is an increasing one greater than f0. Correct d. The frequency is a decreasing one less than f0. Feedback The correct answer is: The frequency is an increasing one greater than f0. Comments Make comment or override mark

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Question 11 Correct Mark 1.00 out of 1.00

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11.2 Examples of Simple Harmonic Motion An object moving in simple harmonic motion has an amplitude of 0.020 m and a maximum acceleration of 20 m/s2. What is the frequency of the system? Select one: a. 32 Hz b. 5.0 Hz Correct c. 0.40 Hz d. 10.1 Hz Feedback The correct answer is: 5.0 Hz Comments Make comment or override mark

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Question 12 Correct Mark 1.00 out of 1.00

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A 3.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, −4.0) m. What is the moment of inertia of this system of masses about the x axis? Select one: a. 81 kg·m2 b. 225 kg·m2 c. 27 kg·m2 d. 144 kg·m2 Correct e. 36 kg·m2 Feedback The correct answer is: 144 kg·m2 Comments Make comment or override mark

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Question 13 Correct Mark 1.00 out of 1.00

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When an object is moving in simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero? Select one: a. the total mechanical energy b. the kinetic energy c. the magnitude of the acceleration

Correct d. the magnitude of the velocity Feedback The correct answer is: the magnitude of the acceleration Comments Make comment or override mark

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Question 14 Correct Mark 1.00 out of 1.00

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The kinetic energy of the bob on a simple pendulum swinging in simple harmonic motion has its maximum value when the displacement from equilibrium is at what point in its swing? Select one: a. zero displacement Correct b. equal the amplitude c. 1/4 the amplitude d. 1/2 the amplitude Feedback The correct answer is: zero displacement Comments Make comment or override mark

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Question 15 Correct Mark 1.00 out of 1.00

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13.5 Reflection and Scattering of Sound 13.6 The Doppler Effect A bat, flying at 3.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s) Select one: a. 51.5 kHz b. 51.2 kHz c. 50.9 kHz Correct d. 40.8 kHz Feedback The correct answer is: 50.9 kHz Comments Make comment or override mark

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Question 16 Correct Mark 1.00 out of 1.00

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Transverse waves travel with a speed of 100 m/s along a taut copper wire that has a diameter of 1.67 mm. What is the tension in the wire? (The density of copper is 8.93 g/cm3.) Select one: a. 195 N Correct b. 782 N c. 62 N d. 391 N e. 98 N Feedback The correct answer is: 195 N Comments Make comment or override mark

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Question 17 Correct Mark 1.00 out of 1.00

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A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.26 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 23 m/s in a time of 0.4 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration? Select one:

a. 33.2 N·m b. 3.3 N·m c. 221.2 N·m d. 22.4 N·m e. 2.2 N·m Correct Feedback The correct answer is: 2.2 N·m Comments Make comment or override mark

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Question 18 Correct Mark 1.00 out of 1.00

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A piece of aluminum has density 2.70 g/cm3 and mass 778 g. The aluminum is submerged in a container of oil of density 0.650 g/cm3. A spring balance is attached with string to the piece of aluminum. What reading will the balance register in grams (g) for the submerged metal? Select one: a. 591 g Correct b. 965 g c. 187 g d. 2 454 g e. 1 025 g Feedback

The correct answer is: 591 g Comments Make comment or override mark

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Question 19 Correct Mark 1.00 out of 1.00

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A mass of 0.4 kg, attached to a spring with a spring constant of 60 N/m, is set into simple harmonic motion. What is the magnitude of the acceleration of the mass when at its maximum displacement of 0.2 m from the equilibrium position? Select one: a. 15 m/s2 b. 30 m/s2 Correct c. 60 m/s2 d. 7.5 m/s2 e. zero Feedback The correct answer is: 30 m/s2 Comments Make comment or override mark

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Question 20 Correct Mark 1.00 out of 1.00

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An avalanche of ice and snow of mass 1,900 kg slides a vertical distance of 170 m down a mountainside. If the temperature of the ice, snow, mountain and surrounding air are all at 0°C, what is the change in entropy of the universe? Select one: a. 5,797 J/K b. 11,595 J/K Correct c. 3865 J/K d. 1,183 J/K e. 23,190 J/K Feedback The correct answer is: 11,595 J/K Comments Make comment or override mark

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Question 21 Correct

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13.1 Sound Is a Longitudinal Wave How far away is a lightning strike if you hear the thunderclap 2.00 s after you see the lightning bolt strike? (vsound = 340 m/s, vlight = 3 × 108 m/s) Select one: a. 1020 m b. 680 m Correct c. 113 m d. 340 m Feedback The correct answer is: 680 m Comments Make comment or override mark

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Question 22 Correct Mark 1.00 out of 1.00

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The wave-related quantity algebraically equivalent to 1/f is: Select one: a. A b. ω c. T

Correct d. λ Feedback The correct answer is: T Comments Make comment or override mark

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Question 23 Correct Mark 1.00 out of 1.00

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A windowpane is half a centimeter thick and has an area of 0.7 m2. The temperature difference between the inside and outside surfaces of the pane is 15 °C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s⋅m⋅°C.) Select one: a. 3,600 J/s b. 2,100 J/s c. 1,180 J/s d. 1,400 J/s e. 1,800 J/s Correct Feedback The correct answer is: 1,800 J/s Comments Make comment or override mark

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Question 24 Correct Mark 1.00 out of 1.00

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The tungsten filament of a light bulb has an operating temperature of about 2,070 K. If the emitting area of the filament is 0.9 cm2, and its emissivity is 0.68, what is the power output of the light bulb? (σ = 5.67 × 10−8 W/m2⋅K4) Select one: a. 637 W b. 56 W c. 94 W d. 59 W e. 64 W Correct Feedback The correct answer is: 64 W Comments Make comment or override mark

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Question 25 Correct Mark 1.00 out of 1.00

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If a nonzero torque is applied to an object, that object will experience: Select one: a. an increasing moment of inertia. b. a constant angular speed. c. a constant moment of inertia. d. an angular acceleration. Correct Feedback The correct answer is: an angular acceleration. Comments Make comment or override mark

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Question 26 Correct Mark 1.00 out of 1.00

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13.2 Amplitude and Intensity of a Sound Wave A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10−12 W/m2) Select one: a. 95.0 dB b. 78.3 dB

c. 88.0 dB Correct d. 92.8 dB Feedback The correct answer is: 88.0 dB Comments Make comment or override mark

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Question 27 Correct Mark 1.00 out of 1.00

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A mass on a spring vibrates in simple harmonic motion at a frequency of 4.5 Hz and an amplitude of 8.6 cm. If the mass of the object is 0.3 kg, what is the spring constant? Select one: a. 8 N/m b. 516 N/m c. 799 N/m d. 28 N/m e. 240 N/m Correct Feedback The correct answer is: 240 N/m Comments Make comment or override mark

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Question 28 Correct Mark 1.00 out of 1.00

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14.4 Phases of Matter and Phase Changes If a 2100-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J) Select one: a. 2.3 × 105 Correct b. 3.8 × 106 c. 1.1 × 105 d. 3.0 × 104 Feedback The correct answer is: 2.3 × 105 Comments Make comment or override mark

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Question 29

Correct Mark 1.00 out of 1.00

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A uniform rod of length L and mass M is pivoted about one end. Attached to the rod is a mass M at its midpoint and at the end opposite the pivot is another mass M. What is the moment of inertia of this configuration about the pivot? Select one: a. b. c. Incorrect d. Feedback The correct answer is: Comments Comment: Make comment or override mark

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Question 30 Correct Mark 1.00 out of 1.00

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Water comes down the spillway of a dam from an initial vertical height of 170 m. What is the highest possible speed of the water at the end of the spillway? Select one: a. 58 m/s Correct b. 6 m/s c. 18 m/s d. 1 666 m/s e. 3 332 m/s Feedback The correct answer is: 58 m/s Comments Make comment or override mark

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Question 31 Correct Mark 1.00 out of 1.00

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What is the intensity of sound from a band with a sound level of 124 dB? (I0 = 10−12 W/m2) Select one: a. 124 W/m2 b. 1.24 W/m2 c. 12.4 W/m2 d. 25 W/m2 e. 2.5 W/m2 Correct

Feedback The correct answer is: 2.5 W/m2 Comments Make comment or override mark

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Question 32 Correct Mark 1.00 out of 1.00

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9.4 Angular Momentum and Kepler's Second Law of Planetary Motion Consider the use of the terms "rotation" and "revolution". In physics: Select one: a. the words are used interchangeably but "rotation" is the preferred word. b. "rotation" is the correct word, and "revolution" should not be used. c. the words are used interchangeably. d. the words have different meaning. Correct Feedback The correct answer is: the words have different meaning. Comments Make comment or override mark

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Question 33 Correct Mark 1.00 out of 1.00

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A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.70 m long and each ball on the end is 0.10 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods? Select one: a. 0.049 kg·m2 Correct b. 0.070 kg·m2 c. 0.007 kg·m2 d. 0.025 kg·m2 e. 0.012 kg·m2 Feedback The correct answer is: 0.049 kg·m2 Comments Make comment or override mark

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Question 34 Correct

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A hoop with mass, M, and radius, R, rolls along a level surface without slipping with a linear speed, v. What is the ratio of rotational to linear kinetic energy? (For a hoop, I = MR2.) Select one: a. 1/4 b. 1/2 c. 1/1 Correct d. 2/5 Feedback The correct answer is: 1/1 Comments Make comment or override mark

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Question 35 Correct Mark 1.00 out of 1.00

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A non-uniform rod of length L and mass M is pivoted about one end. The moment of inertia of this rod about its pivoted end is . Attached to the rod is a mass M at its midpoint and at the end opposite the pivot is another mass 2M. What is the moment of inertia of this configuration about the pivot? Select one: a. None of the above answers is correct.

b. Correct c. d. Feedback The correct answer is: Comments Make comment or override mark

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Question 36 Correct Mark 1.00 out of 1.00

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During an isobaric process which one of the following does not change? Select one: a. temperature b. internal energy c. pressure Correct d. volume Feedback The correct answer is: pressure Comments Make comment or override mark

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Question 37 Correct Mark 1.00 out of 1.00

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What is the total force on the bottom of a 2.0-m-diameter by 2.0-m-deep round wading pool due to the weight of the air and the weight of the water? (Note the pressure contribution from the atmosphere is 1.0 × 105 N/m2, the density of water is 1 000 kg/m3, and g = 9.8 m/s2.) Select one: a. 3.8 × 105 N Correct b. 2.3 × 105 N c. 5.3 × 106 N d. 15 × 106 N e. 3.8 × 106 N Feedback The correct answer is: 3.8 × 105 N Comments Make comment or override mark

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Question 38

Correct Mark 1.00 out of 1.00

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Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is tripled? Select one: a. 3.0 Correct b. 9.0 c. 0.33 d. 1/9 Feedback The correct answer is: 3.0 Comments Make comment or override mark

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Question 39 Correct Mark 1.00 out of 1.00

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A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the: Select one: a. difference between the weight of the stone and the weight of the displaced water. Correct b. weight of the stone.

c. sum of the weight of the stone and the weight of the displaced water. d. weight of the water displaced. Feedback The correct answer is: difference between the weight of the stone and the weight of the displaced water. Comments Make comment or override mark

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Question 40 Correct Mark 1.00 out of 1.00

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A 2.0-mol ideal gas system is maintained at a constant volume of 4.0 L. If 110 J of heat is added, what is the work done on the system? Select one: a. 22 J b. zero Correct c. 3.7 J d. 5.5 J e. −3.7 J Feedback The correct answer is: zero Comments Make comment or override mark

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Question 41 Correct Mark 1.00 out of 1.00

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Area on a P-V diagram has units associated with: Select one: a. energy. Correct b. momentum. c. temperature. d. change in temperature. Feedback The correct answer is: energy. Comments Make comment or override mark

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Question 42 Correct Mark 1.00 out of 1.00

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Material 1 has Young's modulus Y1 and density ρ1, and material 2 has Young's modulus Y2 and density ρ2. If Y1 is 30% more than Y2 and ρ1 is 30% less than ρ2, which material has the higher speed of sound and how much higher is it? Select one: a. Material 2 has a speed of sound more than 80% higher than material 1. b. Material 1 has a speed of sound 30% higher than material 2. c. Material 2 has a speed of sound 30% higher than material 1. d. Material 1 has a speed of sound more than 35% higher than material 2. Correct Feedback The correct answer is: Material 1 has a speed of sound more than 35% higher than material 2. Comments Make comment or override mark

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Question 43 Correct Mark 1.00 out of 1.00

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Which of the first units given below can be units for angular acceleration while the second units can be units for angular velocity? Select one: a. rev/min2, m/s b. deg/hour, rev/minute c. rad/s, rad/s2 d. rad/s2, deg/hour Correct Feedback

The correct answer is: rad/s2, deg/hour Comments Make comment or override mark

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Question 44 Correct Mark 1.00 out of 1.00

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Two vibrating tuning forks, held side by side, will create a beat frequency of what value if the individual frequencies of the two forks are 324 Hz and 308 Hz, respectively? Select one: a. 16 Hz Correct b. 292 Hz c. 308 Hz d. 316.0 Hz e. 632 Hz Feedback The correct answer is: 16 Hz Comments Make comment or override mark

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Question 45 Correct Mark 1.00 out of 1.00

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A 5-m-long organ pipe is open at one end and closed at the other. Its fundamental tone has wavelength: Select one: a. 32.5 m. b. 20 m. Correct c. 5 m. d. 10 m. e. 2.5 m. Feedback The correct answer is: 20 m. Comments Make comment or override mark

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Question 46 Correct Mark 1.00 out of 1.00

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A grindstone spinning at the rate of 20 rev/s has what approximate angular speed? Select one: a. 6.4 rad/s b. 40 rad/s c. 63 rad/s d. 31 rad/s e. 126 rad/s Correct Feedback The correct answer is: 126 rad/s Comments Make comment or override mark

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Question 47 Correct Mark 1.00 out of 1.00

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A bucket of water with total mass 22 kg is attached to a rope, which in turn is wound around a 0.04-m radius cylinder at the top of a well. The bucket is raised to the top of the well and released. The bucket is moving with a speed of 7.0 m/s upon hitting the water surface in the well. What is the angular speed of the cylinder at this instant? Select one: a. 138 rad/s b. 44 rad/s c. 494 rad/s

d. 175 rad/s Correct e. 62 rad/s Feedback The correct answer is: 175 rad/s Comments Make comment or override mark

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Question 48 Correct Mark 1.00 out of 1.00

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The position of a 0.66-kg mass undergoing simple harmonic motion is given by x = (0.160 m) cos (πt/16). What is its position at t = 6.6 s? Select one: a. -0.043 m b. 0.059 m c. 5.893 m d. 0.575 m e. 0.043 m Correct Feedback The correct answer is: 0.043 m Comments Make comment or override mark

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Question 49 Correct Mark 1.00 out of 1.00

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The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6000 K to 6100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity? Select one: a. 6.8% Correct b. 3.4% c. 14% d. 1.6% Feedback The correct answer is: 6.8% Comments Make comment or override mark

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Question 50 Correct Mark 1.00 out of 1.00

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Quintupling the power output from a speaker emitting a single frequency will result in what increase in loudness? Select one: a. 16.1 dB b. 6 dB c. 2 dB d. 1 dB e. 7.0 dB Correct Feedback The correct answer is: 7.0 dB