A new jet engine is being tested in a wind tunnel, as illustrated in the following figure. Air, with standard properties at an altitude of 6000 m, enters the engine at a velocity of 275 m/s through a circular intake port of radius 0.5 m. Fuel enters the engine at a mass flowrate of 2.5 kg/s. If the exhaust gas leaves the engine with an average velocity of 300 m/s through an exit port of radius 0.4 m, calculate the density of the exhaust gas. How would your solution to this problem change if the engine were attached to the wing of an airplane flying through still air at a velocity of 900 km/h?
