6) A mole of monatomic gas initially at 0.83 atm and in thermal contact with the surroundings at 294 K undergoes a reversible isothermal expansion to a new pressure of 0.7 atm. Then it is put in contact with a cold reservoir at 273K, and cooled to 273 K, while the volume is held constant (isochoric cooling). Then it is reversibly and isothermally compressed at 273 K to its original volume, at which point it is placed in contact with the surroundings at 294 and heated at constant volume until the temperature returns to 294 K. Calculate AU ,Q, and W for each of the four stages, and the ratio of the net work for a cycle to the heat absorbed from the hot reservoir. How does the efficiency compare to the efficiency of a Carnot engine operating between the same two temperatures?

6) A mole of monatomic gas initially at 0.83 atm and in thermal contact with the surroundings at 294 K undergoes a reversible isothermal expansion to a new pressure of 0.7 atm. Then it is put in contact with a cold reservoir at 273K, and cooled to 273 K, while the volume is held constant (isochoric cooling). Then it is reversibly and isothermally compressed at 273 K to its original volume, at which point it is placed in contact with the surroundings at 294 and heated at constant volume until the temperature returns to 294 K. Calculate AU ,Q, and W for each of the four stages, and the ratio of the net work for a cycle to the heat absorbed from the hot reservoir. How does the efficiency compare to the efficiency of a Carnot engine operating between the same two temperatures?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

6) A mole of monatomic gas initially at 0.83 atm and in thermal contact with the surroundings at 294 K
undergoes a reversible isothermal expansion to a new pressure of 0.7 atm. Then it is put in contact with
a cold reservoir at 273K, and cooled to 273 K, while the volume is held constant (isochoric cooling). Then
it is reversibly and isothermally compressed at 273 K to its original volume, at which point it is placed in
contact with the surroundings at 294 and heated at constant volume until the temperature returns to
294 K. Calculate AU ,Q, and W for each of the four stages, and the ratio of the net work for a cycle to
the heat absorbed from the hot reservoir. How does the efficiency compare to the efficiency of a Carnot
engine operating between the same two temperatures?

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