• A shaft is made of three parts, as shown in the accompanying figure. Parts AB and CD are made of the same material with a modulus of rigidity of G = 9.8 * 103 ksi, and each has a diameter of 1.5 in. Segment BC is made of a material with a modulus of rigidity of G = 11.2 * 103 ksi and has a diameter of 1 in. The shaft is fixed at both ends. A torque of 2400 lb # in is applied at C. Using three elements, determine the angle of twist at B and C and the torsional reactions at the boundaries