A 4 200 mm 3 B C D 375 mm 4 rad/s E 75 125 mm mm
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A horizontal shaft of diameter 48 mm consists of a gear of mass 24 kg. The horizontal shaft is simply supported at both ends on bearings. The distance between the bearings is 2 m. The shaft rotates at 4800 RPM. The shaft has some manufacturing defect and the center of mass of the rotor deviates from the geometric center of the rotor by 0.22 mm. Determine the amplitude of the steady-state vibration. E = 200 GN/m². a. -0.000232 b. 0.000963 c. 0.000519 d. 0.000139
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2. An automobile weighing 3,000 lb is slowed down uniformly from 40 to 10 mph in a distance of 100 ft by a brake on the drive shaft. Rear wheels are 28-in diameter. Drive-shaft diameter is 1 in., ratio of differential is 40:11. Calculate the extreme fiber stress in drive shaft, neglecting tire, bearing and gear losses. A. 15,000 psi B. 21,900 psi C. 25,000 psi D. 29,400 psi 3. A flywheel has a diameter of 1.5 m, and mass of 800 kg. What torque in N-m, is needed to produce an angular acceleration of 100 revolutions per minute, per second? A. 225 B. 974 C. 1158 D. 2356
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