### Imagine a container placed in a tub of water, as …

02:36
Oklahoma State University

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Problem 7

You may have noticed that when you compress the air in a bicycle pump, the body of the pump gets warmer. (a) Assuming the pump and the air in it comprise the system, what is the sign of w when you compress the air? (b) What is the sign of $q$ for this process? (c) Based on your answers to parts (a) and (b), can you determine the sign of $\Delta E$ for compressing the air in the pump? If not, what would you expect for the sign of $\Delta E ?$ What is your reasoning? [Section 5.2$]$

a) The sign is positive.
b) The sign is negative.
c) the sign of $\Delta \mathrm{E}$ is positive.

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## Video Transcript

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