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# A cylinder contains one liter of air at room temperature ISBN: 9780201380279 40

## Solution for problem 32P Chapter 3

An Introduction to Thermal Physics | 1st Edition

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Problem 32P

A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (105 N/m2). At one end of the cylinder is a massless piston, whose surface area is 0.01 m2. Suppose that you push the piston in very suddenly, exerting a force of 2000 N. The piston moves only one millimeter, beforeit is stopped by an immovable barrier of some sort.

(a) How much work have you done on this system?

(b) How much heat has been added to the gas?

(c) Assuming that all the energy added goes into the gas (not the piston or cylinder walls), by how much does the internal energy of the gas increase?

(d) Use the thermodynamic identity to calculate the change in the entropy of the gas (once it has again reached equilibrium).

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##### ISBN: 9780201380279

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