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{"ops":[{"insert":"9. During flight, the air speed of a turbojet engine is 250 m\/s. Ambient air\r\ntemperature is \u2013 14\u00b0C. Gas temperature at outlet of nozzle is 610\u00b0C. Corresponding enthalpy\r\nvalues for air and gas are respectively 250 and 900 kJ\/kg. Fuel air ratio is 0.0180. Chemical\r\nenergy of fuel is 45 MJ\/kg. Owing to incomplete combustion 6% of chemical energy is not released\r\nin the reaction. Heat loss from the engine is 21 kJ\/kg of air.\r\nCalculate the velocity of the exhaust jet.\n"}]}
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