The rotor of an electric motor has a mass of 25 kg and a, Ask an Expert

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The rotor of an electric motor has a mass of 25 kg and a radius of gyration of 180 mm. It is observed that 4.2 min is required for the rotor to coast to rest from an angular velocity of 3600 rpm. Determine the average magnitude of the couple due to kinetic friction in the bearings of the motor.

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