The device serves as a compact torsional spring. It is made of A-36 steel and consists of a solid inner shaft CB which is surrounded by and attached to a tube AB using a rigid ring at B. The ring at A can also be assumed rigid and is fixed from rotating. If a torque of T = 2 kip in. is applied to the shaft, determine the angle of twist at the end C and the maximum shear stress in the tube and shaft.

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0.5 in. T 12 in. 12 in. B 0.75 in. 1 in.