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**Unformatted text preview: **ConcepTest ConcepTest 11.1 11.1 Figure Skater Figure Skater 1) the same 1) the same 2) larger because she 2) larger because she ’s rotating s rotating faster faster 3) smaller because her rotational 3) smaller because her rotational inertia is smaller inertia is smaller A figure skater spins with her arms extended. When she pulls in her arms, she reduces her rotational inertia and spins faster so that her angular momentum is conserved. Compared to her initial rotational kinetic energy, her rotational kinetic energy after she pulls in her arms must be ConcepTest ConcepTest 11.1 11.1 Figure Skater Figure Skater 1) the same 1) the same 2) larger because she 2) larger because she ’s rotating s rotating faster faster 3) smaller because her rotational 3) smaller because her rotational inertia is smaller inertia is smaller A figure skater spins with her arms extended. When she pulls in her arms, she reduces her rotational inertia and spins faster so that her angular momentum is conserved. Compared to her initial rotational kinetic energy, her rotational kinetic energy after she pulls in her arms must be KE rot =1/2 I ω 2 = 1/2 L ω (used L = I ω ). Since L is conserved, larger ω means larger KE rot . The “extra” energy comes from the work she does on her arms....

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