Question: An apparatus that is used for determining friction factors with air flow through a pipe consists of a reservoir connected to a convergent-divergent nozzle, which in turn is connected to the pipe. The nozzle has a throat diameter of 0.6 cm, and the diameter of the pipe, which is well insulated, is 0.9 cm. In one experiment, the pressure and temperature in the reservoir are 1.7 MPa and 40°C, respectively, and the pressure at a distance of 0.15 m from the inlet to the pipe is 340 kPa. Calculate the average friction factor in the pipe. Assume that the flow in the nozzle is isentropic.