The torque developed in a car engine is 130 N-m. The clutch used is of a single-plate type having two active surfaces. The maximum axial pressure (max) is not to exceed 125 KN/m?. The external diameter of the friction plate is 1.25 times the internal diameter. Determine the dimensions (r and r2) of the friction plate and the axial force (W) exerted by the springs. The coefficient of friction is 0.3. Take service factors into account.
Also, find the minimum pressure.