A 2-1/2-in.-diameter shaft is made of steel with σult = 120,000 psi, σyp = 90,000 psi, and (σe = 44,000 psi, machined surface. The shaft rotates and carries a steady 20,000 in. lb. Assume Tr = 0.1 Taυ. Let K = Kt = 1.7. Find the factor of safety for this shaft.
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