The 8-lb disk B is attached to the shaft of a motor mounted on plate A, which can rotate freely about the vertical shaft C. The motor-plate-shaft unit has a moment of inertia of 0.14 lb ?? ft ?? s2 with respect to the axis of the shaft. If the motor is started when the system is at rest, determine the angular velocities of the disk and of the plate after the motor has attained its normal operating speed of 360 rpm.

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A 9 in. 4.5 in C B 4.5 in. Motor