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Air enters a nozzle steadily and adiabatically at 280 kPa and 350 K with a velocity of 50 m/s and exits at 85 kPa and

Air enters a nozzle steadily and adiabatically at 280 kPa and 350 K with a velocity of 50 m/s and exits at 85 kPa and 300 K. Assume constant specific heat with temperature for air.

a) Calculate the entropy change for this process in kJ/kg.K. b) Determine the isentropic efficiency of the nozzle.

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