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A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30°C and 100 kPa total pressures.
A tank contains argon at 600°C and 200 kPa gage the argon is cooled in a process by heat transfer to the surroundings such that the argon
A tank whose volume is unknown is divided into two parts by a partition. One side of the tank contains 0.01 m3 of refrigerant-134a that is a saturated liquid
A tank has two rooms separated by a membrane. Room A has 1 kg air and volume 0.5 m3, room B has 0.75 m3 air with density 0.8 kg/m3.
A tiny steel cube is suspended in water by a string. If the lengths of the sides of the cube are very small, how would you compare the magnitudes
A thirsty woman opens the refrigerator and picks up a cool canned drink at 40°F. Do you think the can will sweat as she enjoys the drink in a room at 80°F
A thermoelectric generator receives heat from a source at 340°F and rejects the waste heat to the environment at 90°F. What is the maximum thermal efficiency
A thermoelectric cooler has a COP of 0.15 and removes heat from a refrigerated space at a rate of 20 Btu/min.
A student living in a 4-m X 6-m X 6-m dormitory room turns on her 150-W fan before she leaves the room on a summer day, hoping that the room will be cooler
A turbojet is flying with a velocity of 900 ft/s at an altitude of 20,000 ft, where the ambient conditions are 7 psia and 10°F
A turbojet aircraft is flying with a velocity of 320 m/s at an altitude of 9150 m, where the ambient conditions are 32 kPa and -32°C.
A turbojet aircraft flies with a velocity of 900 km/h at an altitude where the air temperature and pressure are -35°C and 40 kPa.
A steel tank contains 6 kg of propane (liquid + vapor) at 20°C with a volume of 0.015 m3. The tank is now slowly heated
A steel tank of cross sectional area 3 m2 and 16 m tall weighs 10 000 kg and it is open at the top. We want to float it in the ocean so it sticks 10 m straight
A supply line of ammonia at 0°C, 450 kPa is used to fill a 0.05-m3 container initially storing ammonia at 20°C, 100 kPa.
A superheater brings 2.5 kg/s saturated water vapor at 2 MPa to 450oC. The energy is provided by hot air at 1200 K flowing outside the steam tube
A subsonic airplane is flying at a 3000-m altitude where the atmospheric conditions are 70.109 kPa and 268.65 K.
A submarine maintains 101 kPa inside it and it dives 240 m down in the ocean having an average density of 1030 kg/m3. What is the pressure difference
A stream of refrigerant-134a at 1 MPa and 12°C is mixed with another stream at 1 MPa and 60°C. If the mass flow rate of the cold stream is twice
A system undergoes a process between two fixed states first in a reversible manner and then in an irreversible manner
A system consists of nitrogen (N2) in a piston-cylinder assembly, initially at p1 = 20 lbf/in2.and occupying a volume of 2.5ft3.
A supply of steam at 14.7 lbf/in. 2, 320 F is needed in a hospital for cleaning purposes at a rate of 30 lbm/s, a supply of steam at 20 lbf/in.2
A supply of steam at 100 kPa, 150°C is needed in a hospital for cleaning purposes at a rate of 15 kg/s
A supply of 5 kg/s ammonia at 500 kPa, 20°C is needed. Two sources are available one is saturated liquid at 20°C and the other is at 500 kPa, 140°C.
Steam enters both stages of the turbine at 500°C. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed 10 percent