Question: A moving piston forces air from a well-insulated 15-cm-diameter pipe through a convergent nozzle fitted to the end of the pipe. The nozzle has an exit diameter of 4 mm and the air is discharged to the atmosphere. If the force on the piston is 3700 N and the air temperature is 30°C, estimate the velocity on the nozzle exit plane, the piston velocity, and the mass flow rate at which the air is discharged from the nozzle.