A thin-walled aluminum tube of rectangular cross section (see figure) has a centerline dimensions b = 6.0 in. and h = 4.0 in. The wall thickness t is constant and equal to 0.25 in.
(a) Determine the shear stress in the tube due to a torque T = 15 k-in.
(b) Determine the angle of twist (in degrees) if the length L of the tube is 50 in. and the shear modulus G is 4.0 ( 106 psi.

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Probs. 3.10-3 and 3.10-4