The composite shaft consists of a mid-section that includes the 1-in.-diameter solid shaft and a tube that is welded to the rigid flanges at A and B. Neglect the thickness of the flanges and determine the angle of twist of end C of the shaft relative to end D. The shaft is subjected to a torque of 800 lb ˆ™ ft. The material is A-36 steel.

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800 lb-ft 1 in. 3 in. 0,25 in. 800 Ib-ft 0.5 ft. -0.75 ft 0.5 ft.