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