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 93%. air enters the turbine at 1360 k and the same pressure as at the exit of the compressor. the turbine isentropic efficiency is 95%, 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.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.