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A cylindrical metal tube of mean radius r = 5 in., length L = 14 ft, and shear modulus G = 11 x 106

A cylindrical metal tube of mean radius r = 5 in., length L = 14 ft, and shear modulus G = 11 x 106 psi carries the torque T = 320 kip-in. Determine the smallest allowable constant wall thickness t if the shear stress is limited to 12 ksi and the angle of twist is not to exceed 2.

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