A solid steel bar of d₁-25.0 mm is enclosed by a steel tube of outer diameter d=37.5 mm and inner diameter d₂-30.0 mm. Both bar and tube are held rigidly by a support at end A and joined securely to a rigid plate at end B. The composite bar which has a length L-550 mm is twisted by a torque T-400 N-m acting on the end plate. a. Determine the maximum shear stresses on the bar and tube. (20 points) b. Determine the shear stress on the inside surface of the tube. (5 points) c. Determine the angle of rotation in degrees of the end plate. (5 points) Tube Bar End plate