As illustrated in Figure $1,$ a double long$-$shoe external brake operates a drum with a diameter of $200mm.$ The coefficient of friction from the brake lining is $0,3,$ and the face width of the shoe is $50$ mm $.$ If the actuating force is $600N,150rpm$

$4\mathrm{.}1$ Determines the braking torque and heat generation on the braking shoes.

$[11]$

$4\mathrm{.}2$ Maximum pressure on each braking shoe.

$4$

Figure $1$ : Double long$-$shoe external drum brake.