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A riveting machine is driven by a constant torque 4 kW motor. Each riveting operation takes 1 second and requires 900 N-m of energy. A flywheel of mass 130 kg and radius of gyration 0.5 m is fitted to the riveting machine. If the speed of the flywheel is 420 rpm before riveting, find

         1 The fall in the speed of the flywheel after riveting.

         2 The number of rivets fitted per hour.

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(i) Fall in speed of the flywheel is

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