Question 9 (5 points) During Takeoff, an aircraft is flying at Vtakeoff=140 ft/s. Once reaching altitude, the cruise speed is Vcruise = 760 ft/s. If the turbojet exhaust velocity in both instances is = Vexhaust 900 ft/s, determine how much greater the propulsive efficiency of the engine is when operated at cruise. (Hint: See Example 4.10) 91.6% 32.3% 26.9% 64.7% Question 10 (5 points) Considering the following turbojet components, in which is work done by the air? Work is done by the air in the Turbine. Work is done by the air in the Compressor. Work is done by the air in the Nozzle. Work is done by the air in the Combustor.