A steel (G = 80 GPa) tube with an inside diameter of 100 mm and an outside diameter of 125 mm is encased in a Monel (G = 65 GPa) tube with an inside diameter of 125 mm and an outside diameter of 180 mm. The tubes are connected at the ends to form a composite shaft. The shaft is subjected to a torque of 12 kN m. Determine The maximum shearing stress in each material. The angle of twist in a 2 m length.