(a) If the expansion is quasi-static, find Q, AU, and W for the process. (b) In another process the same system expands according to the same pressure- volume relationship as in part (a), and from the same initial state to the same final state as in part (a), but the heat transfer in this case is 30 kJ. Find the work transfer for this process. (c) Explain the difference in work transfer in parts (a) and (b).

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Example 4.4
equation:
The internal energy of a certain substance is given by the following
u = 3.56 pv + 84
3
where u is given in kJ/kg, p is in kPa, and v is in m'/kg.
A system composed of 3 kg of this substance expands from an initial pressure of
500 kPa and a volume of 0.22 m to a final pressure 100 kPa in a process in which
pressure and volume are related by pv = constant.
(a) If the expansion is quasi-static, find Q, AU, and W for the process.
(b) In another process the same system expands according to the same pressure-
volume relationship as in part (a), and from the same initial state to the same
final state as in part (a), but the heat transfer in this case is 30 kJ. Find the
work transfer for this process.
(c) Explain the difference in work transfer in parts (a) and (b).
Transcribed Image Text:Example 4.4 equation: The internal energy of a certain substance is given by the following u = 3.56 pv + 84 3 where u is given in kJ/kg, p is in kPa, and v is in m'/kg. A system composed of 3 kg of this substance expands from an initial pressure of 500 kPa and a volume of 0.22 m to a final pressure 100 kPa in a process in which pressure and volume are related by pv = constant. (a) If the expansion is quasi-static, find Q, AU, and W for the process. (b) In another process the same system expands according to the same pressure- volume relationship as in part (a), and from the same initial state to the same final state as in part (a), but the heat transfer in this case is 30 kJ. Find the work transfer for this process. (c) Explain the difference in work transfer in parts (a) and (b).
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