7-179* A 4-in.-diameter shaft is subjected to a torque of 30 kip in., an axial tensile load of 50 kip, and a vertical load of 5 kip, as shown in Fig. P7-179. Determine the principal stresses and the maximum shearing stress at point A on the surface of the shaft. The transverse section through 4 is 24 in. from the right end of the shaft. Figure P7-179 30 kip-in. E 5 kip 50 kip