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## Homework Statement

3 cylinders of mass m and radius 0.5[m]. what is the minimum coefficient of friction between them.

## Homework Equations

Friction: f=μN

## The Attempt at a Solution

f, the friction force, balances the torque of the weight:

$$mg\cos30^0\cdot0.5\sin30^0=\mu\cdot mg\cos30^0\cdot 0.5(1+\sin60^0)\rightarrow \mu=0.26$$

It should be 1/3