Question

A machine part has the shape of a solid uniform sphere of mass 225 g and diameter 3.30 cm . It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point.

How long will it take to decrease its rotational speed by 28.0 rad/s ?
Express your answer in seconds.

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Kinematics

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