A potter's wheel having a radius 0.49 m and a moment of inertia of 12.6 kg · m2 is rotating freely at 47 rev/min. The potter can stop the wheel in 4.0 s by pressing a wet rag against the rim and exerting a radially inward force of 71 N. Find the effective coefficient of kinetic friction between the wheel and the wet rag.

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