Consider the venturi nozzle of Fig. 6.40c, with D = 5 cm and d = 3 cm. Air stagnation temperature is 300 K, and the upstream velocity V1 = 72 m/s. If the throat pressure is 124 kPa, estimate, with isentropic flow theory,
(a) p1;
(b) Ma2; and
(c) the mass flow.