1. Methane (CH4) at 20°C flows through a pipe at a speed of 400 m/s. For methane, R = 518.3 J/(kg · K), γ = 1.32. Is the flow subsonic, sonic, or supersonic?
2. Find the stagnation pressure and temperature of air flowing at 100 f t/s if the temperature in the freestream is 60°F and the pressure is atmospheric.