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Question: A stone has a mass of 6.0 x 10-3 kg & is wedged into the tread of an automobile tyre, as the drawing shows. The coefficient of static friction between the stone & each side of the tread channel is 0.90. When the tyre surface is rotating at 13 m/s, the stone flies out of the tread. The magnitude FN of the normal force that each side of the tread channel exerts on the stone is 1.8 N. Suppose that only static friction supplies the centripetal force, & find the radius r of the tyre.

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