6. A 400 mm diameter brake drum contacts with a single shoe as shown in figure below. The brake drum rotates at a speed of 1200 rpm. The coefficient of friction is 0.25. Determine: i) The normal force on the shoe ii) The required torque to apply the brake iii) The heat generated in the braking system iv) The contact pressure when the cross-sectional area is to be 1200mm 120 mm 250 mm 600mm 400 mm 600 mm F = 1.56kN