A converging diverging frictionless nozzle is connected to a large air reservoir by means of a 20mlong pipe of diameter 0.025 m. The inlet, throat, and exit diameters of the nozzle are, respectively, 0.025 m, 0.0125 m, and 0.025 m. If the air is expanded to the ambient pressure of 100 kPa and f = 0.02 in the pipe, determine the stagnation pressure in the reservoir.

In the previous problem, if the nozzle and pipe were interchanged, then determine the stagnation pressure in the reservoir.