A steel-made cylinder and an aluminum-made hollow tube are seamlessly connect to a fixed support and a rigid disk as shown below. You shall assume that the initial stresses are negligible. Calculate the maximum torque to be applied to the disk if the allowable stresses are 121 MPa in the steel-made cylinder and 69 MPa in the aluminum tube. You may use shear moduli for steel and aluminum 78 GPa and 26 GPa, respectively. 76 mm 8 mm 50 mm 500 mm