The cross-section of an aeroplane elevator is shown below. If the elevator is 2 m long constructed from aluminium alloy with G = 30 GN/m, calculate the total angle of twist of the section and the magnitude of the shear stress in each part for an applied torque of 40 Nm. [Answer given as: 0.0169, 3.43, 2.58, 1.15 x 105 N/m] 600 mm += 1 mm 1=1.5 mm * = 2 mm 75 mm rod