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A potters wheel-a thick stone disk radius 0.500 m and mass 125 kg-is freely rotating at...

A potters wheel-a thick stone disk radius 0.500 m and mass 125 kg-is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 68.0 N. Find the effective coefficient of kinetic friction between the wheel and rag.
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