5-3. A shaft is made of an aluminum alloy having an allowable shear stress of Tallow = 100 MPa. If the diameter of the shaft is 100 mm, determine the maximum torque T that can be transmitted. What would be the maximum torque T' if a 75-mm-diameter hole were bored through the shaft? Sketch the shear-stress distribution along a radial line in each case. T' T