The A-36 steel circular tube is subjected to a torque of l0 kN • m. Determine the shear st...

The A-36 steel circular tube is subjected to a torque of l0 kN • m. Determine the shear stress at the mean radius p = 60 mm and compute the angle of twist of the tube if it is 4 m long and fixed at its far end. Solve the problem using Eqs. 5-7 and 5-15 and by using Eqs. 5-18 and 5-20.