A single plate clutch with both sides effective has an outside diameter of400 mm and an inside diameter of 80 mm. The clutch is designed totransmit 20 kW at 720

rev/min when new. In this condition the coefficientof friction between the clutch contact surfaces can be assumed to be 0.6.The axial thrust on the clutch faces is provided by eight identical springsplaced in parallel, each with a spring stiffness of 16 kN/m. Maximum wearon the clutch plates is limited to 0.6 mm on each contact surface. Calculate EACH of the following: the total spring load (W) required when the clutch is new; the minimum coefficient of friction of the worn clutch plates if 80% ofthe original maximum power can be transmitted.(8