Question

A coin is placed 16.58 cm from the axis of a turntable of variable speed. The...

A coin is placed 16.58 cm from the axis of a turntable of variable speed. The coefficient of static friction between the coin and the turntable is 0.17. The speed of the turntable is slowly
increased. At what speed (in rpm) does the coin start to slip?

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Homework Answers

Answer #1

The maximum force due to static friction is

And the force due to the centrifugal force is

At the critical condition when the coin starts to slip the two forces are equal. i.e

Putting the values in SI units

Converting it to RPM we get

So, the final answer is 30.27 RPM.

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