A thin-walled steel tube having an elliptical cross-section with constant thickness t (see figure) is subjected to

Question:

A thin-walled steel tube having an elliptical cross-section with constant thickness t (see figure) is subjected to a torque T =18 kip-in. Determine the shear stress and the rate of twist (in degrees per inch) if G =12 X 10⁶ psi, t = 0.2 in, a = 3 in., and b = 2 in.