The A-36 steel shaft is made from two segments: AC has a diameter of 0.5 in. and CB has a diameter of 1 in. If the shaft is fixed at its ends A and B and subjected to a uniform distributed torque of 60 lb in./in. along segment CB, determine the absolute maximum shear stress in the shaft.

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5 in. A 0.5 in. 20 in. 60 lb-in./in. 1 in. B