Question: A constant torque (3 mathrm{~kW}) motor drives a punching machine. The mass of the moving parts including the flywheel is (130 mathrm{~kg}) at (750 mathrm{~mm})

A constant torque $3 \mathrm{~kW}$ motor drives a punching machine. The mass of the moving parts including the flywheel is $130 \mathrm{~kg}$ at $750 \mathrm{~mm}$ radius. One punching operation absorbs $1 \mathrm{~kg}$ of energy and takes $1 \mathrm{~s}$. Speed of the flywheel is $240 \mathrm{rpm}$ before punching: Determine

(a) the number of punches per hour and

(b) reduction in speed after the punching operation.

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