200 N 0 300 Nm 45 mm 44 mm 1.2 m 40 mm I m 0.9 m PROBLEM 3.35 The electric motor exerts a 500 N-m-torque on the aluminum shaft ABCD when it is rotating at a constant speed. Knowing that G = 27 GPa and that the torques exerted on pulleys B and C are as shown, determine the angle of twist between (a) B and C, (b) B and D.