Physics (AS & A Level) · Oct / Nov 2017 · Paper 13 · Question 17
9702The first law of thermodynamics
A horizontal cylinder of cross-sectional area A is fitted with a frictionless piston and contains air at pressure P. It is immersed in hot water and the length of the air column increases from x to y. The pressure P is constant. Which equation represents the work done by the trapped air during this process?
- APAy
- B–PAy
- CPA(y – x)
- D–PA(y – x)
As printed in the paper
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Correct answer: C. PA(y – x)
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