Q1. (30P) A steel shaft with an outside diameter of 30 mm is supported in bearings at its ends. Two pulleys are keyed to the shaft, and the pulleys carry belt tensions as shown. The yield strength of the steel is Sy=440 MPa. Determine the factors of safety predicted at points H and K by the maximum-shear stress theory and by the maximum-distortion-energy theory. Ignore the shear stresses caused by the shear forces. (Note: Draw FBD, V and M diagrams and show all your calculations). 1400 N 4200 N 90 y mm 160 mm 160 mm 160 mm H1 160 mm к 1100 N 135 mm 300 N