1-11 A steel shaft is transmitting 55 hp at 1200 rpm. The nature of the load and the type of service of the shaft is such that the allowance shearing stress based on the pure tension is 4000 psi. (MAXIMUM TORSIONAL STRESS AND ANGLE OF TWIST FOR A SOLID SHAFT) a. Calculate the diameter of the shaft to the nearest commercial size of the shafting. b. Calculate the thermal deflection of the shaft in degree for one-foot length of the shaft.