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.
Select the diameter for a hollow steel shaft that is to transmit 36 hp at 1200 rpm. The allowable shear stress is 9000 psi, and the inside diameter of the shaft is to be three-fourths of the outside diameter.
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