
Concept explainers
(a)
The work done by the gas if it follows a constant pressure path
(a)

Answer to Problem 21P
The work done by the gas is
Explanation of Solution
Write the expression for work done at constant pressure
Here,
Write the expression for work done at constant temperature
Here,
Write the expression for work done for a combined constant pressure and temperature process.
Write the ideal gas equation to obtain an expression for
Substitute equation (IV) in (III).
Conclusion:
Substitute
Therefore, the work done by the gas is
(b)
The total change in internal energy during entire process and total heat flow into the gas.
(b)

Answer to Problem 21P
The total change in internal energy during entire process
Explanation of Solution
Write the expression for the internal energy change at constant temperature.
Write the expression for the internal energy change at constant pressure.
Here,
Write the expression for
Substitute equation (VIII) in (VII).
Write the expression for the first law of thermodynamics.
Conclusion:
Substitute
Substitute
Therefore, the total change in internal energy during entire process
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Chapter 15 Solutions
Physics
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