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A hollow steel shaft, 6 ft long, has an outer diameter of 3 in. and an inner diameter of 1.5 in. The shaft is

A hollow steel shaft, 6 ft long, has an outer diameter of 3 in. and an inner diameter of 1.5 in. The shaft is transmitting 200 hp at 120 rev/min. Determine (a) the maximum shear stress in the shaft; and (b) the angle of twist of the shaft in degrees. Use G = 12 x 106 psi for steel.

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