Suppose that the shaft of an engine must withstand a maximum alternating torque of 2,500 lbf-in. What

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Suppose that the shaft of an engine must withstand a maximum alternating torque of 2,500 lbf-in. What minimum diameter, d, should the machined shaft be if it has a profile keyway and is cold rolled SAE 1050 steel? Take N = 2 with 99% reliability. Endless life