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18–18. The wheel has a mass of 100 kg and a radius of gyration of kO = 0.2 m. A motor supplies a torque
M = (40 u + 900) N # m, where u is in radians, about the drive
shaft at O. Determine the speed of the loading car, which has a mass of 300 kg, after it travels s = 4 m. Initially the car is at rest when s = 0 and u = 0°. Neglect
the mass of the attached cable and the mass of the car’s wheels.
*18–20. If P = 200 N and the 15-kg uniform slender rod starts from rest at u = 0°, determine the rod’s angular velocity at the instant just before u = 45°.
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