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Physics 1 Problem Solutions 111

Physics 1 Problem Solutions 111 - Chapt 12 Rotational...

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Unformatted text preview: Chapt. 12 Rotational Dynamics 107 012 qmult 00570 2 1 2 moderate memory: conservation of ang. momentum Extra keywords: new place 11. You are Katherina Witt (or Dorothy Hamill, Karen Magnussen, or even Barbara Ann Scott) at the Winter Olympics. After executing a flawless quad followed by a physically impossible horizontal leap, you torque yourself (using heal? toe?) into a spin. You now decide to speed up your spin (increase your ω ). Remembering that without a net external torque, angular momentum ( L = Iω ) is conserved and assuming that the ice friction torque on your blades is negligible, you do what? HINT: The more spread out from the axis a fixed amount of mass is, the greater the rotational inertia. a) PULL your arms in to INCREASE your rotational inertia. b) PULL your arms in to DECREASE your rotational inertia. c) FLING your arms out to DECREASE your rotational inertia. d) FLING your arms out to INCREASE your rotational inertia....
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