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The angular speed of a star spinning about its axis increases as the star begins to contract to a smaller radius. Which of the following quantities as

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The angular speed of a star spinning about its axis increases as the star begins to contract to a smaller radius. Which of the following quantities associated with the star must decrease as this occurs?
A. Moment of inertia
B. Angular momentum
C. Rotational kinetic energy
D. Net external torque
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Correct Answer - A
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