The 60-mm-diameter shaft is made of 6061-T6 aluminum having an allowable shear stress of τ allow = 80 MPa. Determine the maximum allowable torque T. Also, find the corresponding angle of twist of disk A relative to disk C.The 60-mm-diameter shaft is made of 6061-T6 aluminum having an allowable shear stress of τ allow = 80 MPa. Determine the maximum allowable torque T. Also, find the corresponding angle of twist of disk...