Practice-Quiz7

Practice-Quiz7 - (Draw a good diagram.) 2 (1.5 pts) On a...

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Physics 7B Practice Quiz 7 Grade: DL Section: Name: _______________________ ID: _______________________ I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature No books or notes. Calculators OK. Show all your work below. Answers alone do not receive credit! 1. (1.5 pts) A tire swing hangs from the branch of a tree. The rope is tied at a distance of 3 m from where the branch connects to the main trunk of the tree. If the mass of the tire, rope and child is 60 kg, then what is the torque around the point where the branch connects to the tree?
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Unformatted text preview: (Draw a good diagram.) 2 (1.5 pts) On a very windy day one of the coast redwoods in the Arboretum experiences a lateral force of 6500 N distributed over its entire height of 20 m. What is the torque around the base of the tree? If the wind blows from the north, in what direction is the torque? 3. (1.5 pts) Each arm of a see-saw has a length of 2 m. You and your friend sit on opposite ends. Your friend has a mass of 55 kg, and you have a mass of 60 kg. What is the net torque around the center of the see-saw? momentum: p = m v impulse = change in momentum = F t 2...
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This note was uploaded on 01/05/2011 for the course PHY 7B PHY7B taught by Professor Cebra during the Spring '10 term at UC Davis.

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Practice-Quiz7 - (Draw a good diagram.) 2 (1.5 pts) On a...

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