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The mechanism shown in the figure is in equilibrium for an applied load of P = 20 kN. Specifications for the mechanism limit the shear stress in the steel [G= 81 GPa] shaft BC to 53 MPa,the shear stress in bolt A to 91 MPa, and the vertical deflection of joint D to a maximum value of35 mm. Assume that the bearings allow the shaft to rotate freely. Using L= 1,300 mm, a = 125 mm,and b = 240 mm, calculate (a) the minimum diameter required for shaft BC. (b) the minimum diameter required for bolt A.

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