2. A rigid tank initially contains 2.75 L of air at 125 kPa and 27°C. An electrical resistance heater inside the tank is turned on, and electrical work is done on the air in the amount of 1.588 kJ. The final pressure of the air is measured to be 225 kPa. Assuming the surroundings to be 23°C and using the constant specific heats (cold-air-standard-assumptions), determine (a) the entropy change of air and (b) the entropy generation during this process.

2. A rigid tank initially contains 2.75 L of air at 125 kPa and 27°C. An electrical resistance heater inside the tank is turned on, and electrical work is done on the air in the amount of 1.588 kJ. The final pressure of the air is measured to be 225 kPa. Assuming the surroundings to be 23°C and using the constant specific heats (cold-air-standard-assumptions), determine (a) the entropy change of air and (b) the entropy generation during this process.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Concept explainers

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.

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pleas my questions. please

2. A rigid tank initially contains 2.75 L of air at 125 kPa and 27°C. An electrical resistance heater inside the tank is turned
on, and electrical work is done on the air in the amount of 1.588 kJ. The final pressure of the air is measured to be 225
kPa. Assuming the surroundings to be 23°C and using the constant specific heats (cold-air-standard-assumptions),
determine (a) the entropy change of air and (b) the entropy generation during this process.
(20P) [PÇ-1: % 60; PÇ-2: %40]

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