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Figure P 3.24 shows an object whose mass is 50 lb attached to a rope wound around a pulley. The radius of the pulley is 3 in. If the mass falls at a constant velocity of 3 ft/s, determine the power transmitted to the pulley, in horsepower, and the rotational speed of the pulley, in RPM. The acceleration of gravity is g 32.0 ft/s2 .
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Order Paper NowAn electric motor draws a current of 10 amp with a voltage of 110 V. The output shaft develops a torque of 10.2 and a rotational speed of 1000 RPM. For operation at steady state, determine
(a) the electric power required by the motor and the power developed by the output shaft, each in kW.
(b) the net power input to the motor, in kW.
(c) the amount of energy transferred to the motor by electrical work and the amount of energy transferred out of the motor by the shaft, in during 2 h of operation.
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