# Q5S - Physics 53 Summer 2010 Quiz 5 Solutions Check the...

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Quiz 5 Solutions Check the best answer. 1. A student sits on a stool that can rotate freely about a vertical axis. She holds a bicycle wheel with its axle vertical, spinning rapidly with its angular momentum L vertically upward. Nothing is moving except the wheel. She Fips the axle 180° so it is vertical again but with the wheel spinning the other way. The angular momentum about the vertical axis of everything in the system except the wheel is: Zero. L . L . 2 L . [The total angular momentum must add to L ] Check T or ± depending on whether the statement is true or false. 2. If a body has only two forces acting on it, of equal magnitude and opposite direction but not along the same line, linear momentum is conserved but angular momentum is not conserved about any point. T ± [The total external torque is not zero about any point.] Physics 53 Summer 2010 1

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3. Two children are sitting at opposite ends of a thin plank of length d and mass M , which is mounted on a frictionless vertical pivot at its center so it can rotate
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## This note was uploaded on 10/19/2011 for the course PHYSICS 53L taught by Professor Mueller during the Spring '07 term at Duke.

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Q5S - Physics 53 Summer 2010 Quiz 5 Solutions Check the...

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