The design of the gear-and-shaft system shown requires that steel shafts of the same diameter be used for both AB and CD. It is further required that Tmax 70 MPa and that the angle op through which end D of shaft CD rotates not exceed 3.0. Knowing that G= 77 GPa, determine the required diameter of the shafts. A 200 mm C 75 mm 650 N-m D B 110 mm 400 mm d = mm