Air enters a compressor operating at steady state with a pressure of 14.7lbf/in^2 and a volumetric flow rate of 8 ft^3/s. the air velocity in the exit pipe is 225 ft/s and the exit pressure is 150 lbf/in^2. If each unit mass of air passing from inlet to exit undergoes a process described pv^1.3=constant, determine the diameter of the exit pipe, in inches.