The solid homogeneous cylinder is released from rest

on the ramp. If $=40,{}_s=0\mathrm{.}30,$ and ${}_k=0\mathrm{.}20,$ de$-$

termine the acceleration of the mass center $G$ and the

friction force exerted by the ramp on the cylinder.

Ans: $F=7\mathrm{.}57N,a=4\mathrm{.}20\frac{m}{s^2}$