Practice-Quiz8

Practice-Quiz8 - a) After you drop the weights, does your...

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Physics 7B Practice Quiz 8 First two letters of last name: DL Section Number ____________ Name (last, first) ____________________________ Student 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. Imagine you are sitting on the spinning stool, holding two heavy weights in your hands with your arms straight out. You are rotating at a rate of 1 rev/sec. At a certain moment you drop the weights.
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Unformatted text preview: a) After you drop the weights, does your rotational speed increase, decrease, or stay the same? Explain briefly. b) Is angular momentum conserved in this process? Explain briefly. 2. Imagine a wheel rolling without slipping down an inclined track, and a frictionless block sliding down the same track. Both start from rest at the top of the track. Which one reaches the bottom more quickly? Explain your reasoning. constant acceleration, 1D: x(t) = x + v t + at 2 v(t) = v + at a = dv/dt constant acceleration, 1D: x(t) = x + v t + at 2 v(t) = v + at a = dv/dt...
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Practice-Quiz8 - a) After you drop the weights, does your...

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