Q: 1 kg of oxygen is heated from 20 to 120°C
1 kg of oxygen is heated from 20 to 120°C. Determine the amount of heat transfer required when this is done during a (a) constant-volume process and (b) isobaric process.
See AnswerQ: A 10-ft3 tank contains oxygen initially at 14.7
A 10-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the su...
See AnswerQ: The basic barometer can be used to measure the height of a
The basic barometer can be used to measure the height of a building. If the barometric readings at the top and at the bottom of a building are 675 and 695 mmHg, respectively, determine the height of t...
See AnswerQ: The volume of 1 kg of helium in a piston–cylinder
The volume of 1 kg of helium in a piston–cylinder device is initially 5 m3. Now helium is compressed to 2 m3 while its pressure is maintained constant at 130 kPa. Determine the initial and final tempe...
See AnswerQ: A 4-m × 5-m × 7-m
A 4-m × 5-m × 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10,000 kJ/h, and a 100-W fan is used to distribute...
See AnswerQ: An insulated rigid tank is divided into two equal parts by a
An insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains 4 kg of an ideal gas at 800 kPa and 50°C, and the other part is evacuated. The partition...
See AnswerQ: An ideal gas contained in a piston–cylinder device under goes
An ideal gas contained in a piston–cylinder device under goes an isothermal compression process which begins with an initial pressure and volume of 100 kPa and 0.6 m3, respectively. During the process...
See AnswerQ: A 4-m × 5-m × 6-m
A 4-m × 5-m × 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 5 to 25°C within 17 min. Assumin...
See AnswerQ: An insulated piston–cylinder device initially contains 0.3 m3
An insulated piston–cylinder device initially contains 0.3 m3 of carbon dioxide at 200 kPa and 27°C. An electric switch is turned on, and a 110-V source supplies current to a resistance heater inside...
See AnswerQ: Argon is compressed in a polytropic process with n = 1.
Argon is compressed in a polytropic process with n = 1.2 from 120 kPa and 10°C to 800 kPa in a piston–cylinder device. Determine the work produced and heat transferred dur...
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