A piece of machinery is in the form of a uniform solid sphere with a mass of 225 g and a diameter of 3.00 cm, and it rotates around a frictionless axis passing through its center; however, at a point on its equator it rubs against a metal, producing a frictional force of 0.0200 N at that point. a) Calculate its angular acceleration. b) How long will it take to decrease its rotational speed by 22.5 rad / s?

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