air flows at 500 m/s, a static pressure of 50 kpa, and a stagnation temperature of 320 k in a 10 cm diameter duct. the duct converges to a diameter of 9 cm, where the flow exhausts to an ambient pressure of 100 kpa. find: (a) the mach number, velocity, static pressure, and stagnation pressure at the exit; (b) the mass flow rate through the system.