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Air at 7°C enters a turbojet engine at a rate of 16 kg/s and at a velocity of 300 m/s (relative to the engine). Air is heated in the combustion chamber at a rate 15,000 kJ/s and it leaves the engine at 427°C. Determine the thrust produced by this turbojet engine. (Hint: Choose the entire engine as your control volume.)
consider a 15-cell stack hydrogen fuel cell operating steadily in series with 200 cm2 active area per electrode with a
the carpenter builds the square frame abcd and then braces it with member ef as shown in order to prevent racking
natural gas consists of a mixture of several gases. one example is 84 percent methane 14.8 percent ethane .70 percent
A compressor is employed to compress gas flowing steadily through it. The gas enters the compressor at a temperature of 16°C, a pressure of 100 kPa, and with an enthalpy of 391.2 kJ/kg. The gas leaves the compressor at a temperature of 245°C, a press..
A constant-area duct is fed by a converging-only nozzle. The nozzle receives air from a large chamber at p1=600 KPa and T1=550 K. The duct has a friction length of 5.3, and it is choked at the exit. What is the pressure at the end of the duct? If 80 ..
a 25-hp 240-v 77.8-a shunt motor has an armature resstence of 0.083 ohms and a field-circuit resistance of 125 ohms.
air enters the compressor of an air-standard brayton cycle at 100kpa 300k with a volumetric flow rate of 5m3s. the
consider a regenerative rankine cycle with a 600c and 4-mpa throttle a 5-kpa condenser and an open feedwater heater at
a piston-cylinder device contains steam initially at 1 mpa 450degc and 2.5 m3. steam is allowed to cool at constant
At what equivalence ratio for octane-air mixtures does the carbon to oxygen ratio of the system equal one? Why is this of interest?
air flows steadily through a constant-area duct. at section 1 the air is at 400 kpa abs 325k and 150 ms. as a result of
1. what are some applications of the bernoulli equation?2. what is the first law of thermodynamics?3. what are specific
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