(7) A compound steel [G = 80 GPa] shaft (Figure P6.16) consists of a solid 55-mm- diameter segment (1) and a solid 40-mm-diameter segment (2). The allowable shear stress of the steel is 70 MPa, and the maximum rotation angle at the free end of the compound shaft must be limited to pC 3. Determine the magnitude of the largest torque TC that may be applied at C. (1) 0.8 m 1.2 m Te X