2. Helium enters a converging-diverging nozzle at 60 m/s, 310 °C, and 300 kPa, and it leaves the nozzle at a supersonic velocity. Determine the velocity of helium at the throat and the mass flow rate when the throat diameter is 3 cm. (hint: Watch"Chapter 11-CO2 Converging-diverging.mp4")

Fig: 1