Question: Air flows down an adiabatic constant area circular pipe that has a diameter of 1.5 cm. At the inlet to the pipe, the Mach number is 0.16. Determine the pipe lengths that would give exit Mach numbers of 0.56 and 1. Assume that the friction factor, f, is 0.004. If the stagnation conditions at the inlet to the pipe are maintained at the same values, find the percentage change in the flow rate through the pipe for the two cases considered if the length of the pipe is increased by 1 m.