Warm-Up Exercise 9

Due 10:00 am, Wed, Jan. 25

Physics 123, Winter Semester, 2012

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Did you carefully complete the reading assignment?
yes no

Molar specific heats is yet another example of how the "microscopic thinking" of a physicist leads to a simple relationship for macroscopic quantities. It's important to practice thinking like this. (It's an acquired skill---it didn't come naturally for me)

Even if you answered yes to the previous question, the derivation of molar specific heats for an ideal gas was probably still rather murky. Please go back and carefully re-read that discussion. Explicitly right down questions that you have as you go. If you can't answer them by the end of your re-reading, let me know below and we'll discuss in class as much as we have time for.
Yes, I carefully re-read No, I didn't

On the P-V diagram, two processes are shown. For each one discuss whether Q, W, and ΔE_int are positive, negative, or zero.

Near the end of section 21.3 (page 608 in the 8th edition of our text), the book talks about "taking the total differential." What does that mean? (Doing this is another acquired skill that is good to practice.)

Explain why some modes (vibrational or rotational) do not contribute to the specific heat except at higher temperatures.

Was there anything that you didn't understand in the reading assignment? If so, explain.


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