A circular tube AB is fixed at one end and free at the other. The tube is subjected to concentrated torques as shown in the figure. If the outer radius of the tube is 1.5 in. and the thickness is 3/4 in., calculate the strain energy stored in the tube. Let G = 11,800 ksi.

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A -5 ft- d = 3 in. 10 ft 1000 kip-in. in. 2000 kip-in. B