An ice skater spins with her arms extended and then pulls her arms in and spins faster. Which statement is correct?
a) Her kinetic energy of rotation doe s not change because, by conservation of angular momentum, the fraction by which her angular velocity increases is the same as the fraction by which her rotational inertia decreases.
b) Her kinetic energy of rotation increases because of the work she does to pull her arms in.
c) Her kinetic energy of rotation decreases because of the decrease in her rotational inertia; she loses energy because she gradually gets tired.
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