Helium expands in a nozzle from \(0.8 \mathrm{MPa}, 500 \mathrm{~K}\), and negligible velocity to \(0.1 \mathrm{MPa}\). Calculate the throat and exit areas for a mass flow rate of \(0.34 \mathrm{~kg} / \mathrm{s}\), assuming the nozzle is isentropic. Why must this nozzle be convergingdiverging? Answers: \(5.96 \mathrm{~cm}^{2}, 8.97 \mathrm{~cm}^{2}\)