, 12.11.2019 04:31, SmartKitty

# Amachine part has the shape of a solid uniform sphere of mass 250 g and a diameter of 4.30 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. part (a): find its angular acceleration. let the direction the sphere is spinning be the positive sense of rotation. part (b): how long will it take to decrease its rotational speed by 21.0 rad/s?

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