Problem

For the following problem, unless noted otherwise use a modulus of rigidity G of 12,000,00...

For the following problem, unless noted otherwise use a modulus of rigidity G of 12,000,000 psi (83 000 MPa) for steel and 4,000,000 psi (28 000 MPa) for aluminum.

A solid steel shaft is to resist a torque of 9000 lb-in. The angle of twist is not to exceed 0.12° per foot of length, and the allowable shear stress is 8000 psi. Calculate the required diameter of the shaft and select an appropriate diameter to use.

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