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A cooking pan whose inner diameter is 20 cm is filled with water and covered with a 4-kg lid.
A convergent nozzle has a minimum area of 1 ft2 and receives air at 25 lbf/in 2, 1800 R flowing with 330 ft/s. What is the back pressure that will produce
A convergent nozzle has minimum area of 0.1 m2 and receives air at 175 kPa, 1000 K flowing with 100 m/s.
A convergent nozzle with exit diameter of 1 in. has an air inlet flow of 68 F, 14.7 lbf/in 2 (stagnation conditions)
A convergent-divergent nozzle has a throat area of 100 mm2 and an exit area of 175 mm2. The inlet flow is helium at a total pressure of 1 MPa
A cylinder contains ethylene, C2H4, at 1.536 MPa, -13°C. It is now compressed in a reversible isobaric (constant P) process to saturated liquid.
A crane lifts a bucket of cement with a total mass of 450 kg vertically up with a constant velocity of 2 m/s. Find the rate of work needed to do that.
A counter flowing heat exchanger cools air at 600 K, 400 kPa to 320 K using a supply of water at 20?C, 200 kPa.
A cooler in an air conditioner brings 0.5 kg/s air at 35oC to 5oC, both at 101 kPa and it then mix the output with a flow of 0.25 kg/s air at 20oC
A cylinder contains ethylene, C2H4, at 222.6 lbf/in 2, 8 F. It is now compressed in a reversible isobaric (constant P) process to saturated liquid.
A cylinder containing R-134a at 50 F, 20 lbf/in 2, has an initial volume of 1 ft3. A piston compresses the R-134a in a reversible, isothermal process
A cylinder containing ammonia is fitted with a piston restrained by an external force that is proportional to cylinder volume squared
A cylinder containing 1 kg of ammonia has an externally loaded piston. Initially the ammonia is at 2 MPa, 180°C and is now cooled to saturated vapor
A cutting tool uses a nozzle that generates a high speed jet of liquid water. Assume an exit velocity of 1000 m/s of 20oC liquid water with a jet diameter
A compressor in a commercial refrigerator receives R-22 at -25oC, x = 1. The exit is at 800 kPa, 40oC. Neglect kinetic energies and find the specific work.
A compressor brings R-134a from 150 kPa, -10oC to 1200 kPa, 50oC. It is water cooled with a heat loss estimated as 40 kW and the shaft work input
The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure sub-cooled by 5°C. If the compressor consumes 3.3 kW of power
A constant pressure piston cylinder contains 0.2 kg water as saturated vapor at 400 kPa. It is now cooled so the water occupies half the original volume.
A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa from 300°C to saturated liquid at 10 kPa. The cooling is done by lake water at 20°C
A condenser (cooler) receives 0.05 kg/s R-22 at 800 kPa, 40oC and cools it to 15oC. There is a small pressure drop so the exit state is saturated liquid
A computer in a closed room of volume 5000 ft3 dissipates energy at a rate of 10 hp. The room has 100 lbm of wood, 50 lbm of steel and air
A container equipped with a resistance heater and a mixer is initially filled with 3.6 kg of saturated water vapor at 120°C
A constant-volume tank contains a mixture of 1 kmol H2 and 1 kmol O2 at 25°C and 1 atm. The contents are ignited. Determine the final temperature
A constant-volume tank contains a mixture of 120 g of methane (CH4) gas and 600 g of O2 at 25°C and 200 kPa. The contents of the tank are now ignited
A constant-volume tank contains 5 kg of air at 100 kPa and 327°C. The air is cooled to the surroundings temperature of 27°C