Determine the force $\backslash ($ P $\backslash )$ that must be applied to the handle of the lever so that the wheel is on the verge of turning if $\backslash (\backslash$mathrm$\{$M$\}=300\backslash$mathrm$\{$~N$\}-\backslash$mathrm$\{$m$\}\backslash ).$ The coefficient of static friction $\backslash (\backslash$left$(\backslash$mu$\_\{$s$\}\backslash$right$)\backslash )$ between the belt and the wheel is $0\mathrm{.}3.$

Hint: Draw a free body diagram of member ACD. Use the belt friction equation to relate the forces at A and D$.$

Figure $30.$ Wheel and brake assembly