Question

A coin with mass 3.1 grams is at rest atop a wooden block of mass 20 grams. The block is on a spinning platform with a 12 centimeter radius.

The coefficients of friction between the platform and the wooden block are μs = 0.75 and μk = 0.64

The coefficient of friction between the wooden block and the coin are μs = 0.52 and μk = 0.45

What is the maximum speed the penny and block can have so that neither of them slide off of the spinning platform? Convert that answer into revolutions per minute to get a rate of rotation.

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