Air enters the diffuser of a turbojet engine at 18 kpa, 216 k, with a volumetric flow rate of 230 m3/s and a velocity of 265 m/s. the compressor pressure ratio is 15, and its isentropic efficiency is 91%. air enters the turbine at 1360 k and the same pressure as at the exit of the compressor. the turbine isentropic efficiency is 93%, and the nozzle isentropic efficiency is 97%. the pressure at the nozzle exit is 18 kpa. on the basis of an air-standard analysis, calculate the thrust magnitude, in kn.