And again, choose the best statement below: a. When she pulls in her arms, the work she performs on them turns into increased rotational kinetic energy. b. When she pulls in her arms, her moment of inertia is conserved. c. When she pulls in her arms, her angular momentum decreases so as to conserve energy. c. When she pulls in her arms, her rotational potential energy increases as her arms approach the center. d. When she pulls in her arms, her rotational kinetic energy is conserved and therefore stays the same. e. When she pulls in her arms, her rotational kinetic energy must decrease because of the decrease in her moment of inertia

Question

Humberto Short

Physics

27 October, 04:31

And again, choose the best statement below: a. When she pulls in her arms, the work she performs on them turns into increased rotational kinetic energy. b. When she pulls in her arms, her moment of inertia is conserved. c. When she pulls in her arms, her angular momentum decreases so as to conserve energy. c. When she pulls in her arms, her rotational potential energy increases as her arms approach the center. d. When she pulls in her arms, her rotational kinetic energy is conserved and therefore stays the same. e. When she pulls in her arms, her rotational kinetic energy must decrease because of the decrease in her moment of inertia

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Answers (1)

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Greta Molina · Answer 1

a. When she pulls in her arms, the work she performs on them turns into increased rotational kinetic energy

Explanation:

When she pulls her arms, the moment of inertia decreases due to which the angular velocity increases to conserve angular momentum. Due to increase in angular velocity, her rotational kinetic energy increases. The source of this additional energy is work done by her against the centrifugal force. The work done by her is converted into rotational kinetic energy.