Solve the below problem:
Q: Air, at stagnation conditions of 450 K and 250 kPa, flows through a nozzle. At section 1, where the area = 15 cm2, there is a normal shock wave. If the mass flow is 0.4 kg/s, estimate
(a) The Mach number; and
(b) The stagnation pressure just downstream of the shock.