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## Homework Statement

A coin is placed 18cm from the axis of a rotating turntable of variable speeds. If the coefficient of friction is 0.68, what is the maximum r.p.m that the coin can handle before sliding off?

## Homework Equations

This is basically what I need..

I know there's mv^2/r

But which equation do I need for RPM questions?

## The Attempt at a Solution

None at the moment, not sure of the equation I'm supposed to use :S