The copper pipe has an outer diameter of 3 in. and an inner diameter of 2.5 in. If it is tightly secured to the wall at C and a uniformly distributed torque is applied to it as shown, determine the shear stress at points A and B. These points lie on the pipe€™s outer surface. Sketch the shear stress on volume elements located at A and B.

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150 Ib-ft/ft 1 ft 2 ft 2 ft