Apunching operation, performed by a cranked punch, requires 300j of work which is consumed during 30° of crankshaft movement. the torque pattern is rising steadily (from onm of torque) for 10°, constant for 10° and then falling steadily (back to 0nm of torque) for a further 10° of crankshaft movement. the remaining 330° of crankshaft movement involves no work. the shaft on which the flywheel is fitted rotates at a mean speed of 200rpm, and is permitted to vary ±5% in this application referred to determine the necessary moment of inertia the flywheel must have given that the other parts of the machine contribute 1.5 kg. m^2 the flywheel shaft