(Answered) A coin is placed 135 cm from the axis of a rotating

Statistics

A coin is placed 13.5 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 30 rpm is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?

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