A simple torsion-bar spring is shown in the figure. The shear stress in the steel [G = 11,500 ksi] shaft is not to exceed 10,000 psi, and the vertical deflection of joint D is not to exceed 0.5 in. when a load P = 3,400 lb is applied. Neglect the bending of the shaft, and assume that the bearing at C allows the shaft to rotate freely. Determine the minimum diameter required for the shaft. Use dimensions of a = 72 in., b = 30 in., and c = 18 in.

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