A Child Standing on the Edge of a Freely Spinning

question 49

Multiple Choice

A child standing on the edge of a freely spinning merry-go-round moves quickly to the center. Which one of the following statements is necessarily true concerning this event and why?

• A)The angular speed of the system decreases because the moment of inertia of the system has increased.
• B)The angular speed of the system increases because the moment of inertia of the system has increased.
• C)The angular speed of the system decreases because the moment of inertia of the system has decreased.
• D)The angular speed of the system increases because the moment of inertia of the system has decreased.
• E)The angular speed of the system remains the same because the net torque on the merry-go-round is zero N . m.

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