The converging–diverging nozzle shown in Fig. P3.22 expands and accelerates dry air to supersonic speeds at the exit, where p2=8 kPa and T2=240 K. At the throat, p1=284 kPa, T1=665 K, and V1=517 m/s. (D1=1 cm, D2=2.5 cm.) For steady compressible flow of an ideal gas, estimate (a) the mass flow in kg/h, (b) the velocity V2, and (c) the Mach number Ma2.