A single block brake as shown in Figure 16.8 (b) has a diameter of brake drum 1.2 m. It can withstand 250 Nm torque at 500 rpm and coefficient of friction between block and drum is 0.3. Determine the...

A single block brake as shown in Figure 16.8 (b) has a diameter of brake drum 1.2 m. It can withstand 250 Nm torque at 500 rpm and coefficient of friction between block and drum is 0.3. Determine the force required to apply when the drum rotates in (a) clockwise direction and (b) anticlockwise direction. The angle of contact is 2θ = 30° and x = 140 mm, a = 30 mm, l = 1000 mm.