A punching press is driven by a constant torque electric motor. The press is provided with a flywheel that rotates at maximum speed of 225 rpm. The radius of gyration of the flywheel is 0.5 m. The press punches 720 holes per hour; each punching operation takes two seconds and requires 15 kNm of energy. If speed of the same is not to fall below 200 rpm, (a) find the power of the motor and [10 Marks] (b) the minimum mass of the flywheel
