Trabajo N3

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Problema 11.Un cubo de aluminio de 15 cm de lado esta suspendido de un resorte. La mitad del cubo esta sumergido en aceite de densidad relativa 0.80 y la otra mitad en agua. Determinar la fuerza de tracciΓ³n en el resorte si el peso especΓ­fico del aluminio es de 2640 𝐾𝑔/π‘š^3. Sol: Datos:

1.- D.C.L.

πΏπ‘œπ‘›π‘”. (𝑙) = 0.15 π‘š. π·π‘…πœƒ = 0.80 π›Ύπœƒ = 800

𝐾𝑔 ⁄ 3 π‘š

𝛾𝐴𝑙 = 2640

𝐾𝑔⁄ π‘š3

𝛾𝐻2𝑂 = 1000

𝐾𝑔⁄ π‘š3

𝐹𝑏1 = πΉπ‘’π‘’π‘Ÿπ‘§π‘Ž 𝑑𝑒 πΈπ‘šπ‘π‘’π‘—π‘’ 𝑑𝑒𝑙 π‘Žπ‘π‘–π‘‘π‘’ 𝐹𝑏2 = πΉπ‘’π‘’π‘Ÿπ‘§π‘Ž 𝑑𝑒 πΈπ‘šπ‘π‘’π‘—π‘’ 𝑑𝑒𝑙 𝐻2𝑂

2.- βˆ‘ 𝑭𝒗 = 𝟎 : 0 = 𝑇 + 𝐹𝑏1 + 𝐹𝑏2 βˆ’ π‘Š 𝑇 = π‘Š βˆ’ 𝐹𝑏1 βˆ’ 𝐹𝑏2 𝑇 = 𝛾𝐴𝑙 βˆ— βˆ€π΄π‘™ βˆ’ π›Ύπœƒ βˆ— βˆ€π΄π‘™π‘†π‘’π‘šπ‘’π‘Ÿπ‘”π‘–π‘‘π‘œ βˆ’ 𝛾𝐻2𝑂 βˆ— βˆ€π΄π‘™π‘†π‘’π‘šπ‘’π‘Ÿπ‘”π‘–π‘‘π‘œ T= 2640

Kg⁄ Kg Kg *0.153 m3 - 800 ⁄ 3 *0.152 *0.075 m3 -1000 ⁄ 3 *0.152 *0.075 m3 m3 m m

𝑻 = πŸ“. πŸ–πŸ•πŸπŸ“ π‘²π’ˆ.

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