The steel shaft is formed by attaching a hollow shaft to a solid shaft. Determine the maximum torque T that can be applied to the ends of the shaft with- out exceeding a shear stress of 70 MPa or an angle of twist of 2.5 in the 3.5-m length. Use G = 83 GPa for steel. 100 mm 2 m 70 mm FIG. P3.8 70 mm 1.5 m