Week 18 Physics IDEAl Solution and Quiz 13 Correction

The IDEAl solution for the week is based on, but different from, the back page of Quiz 13. Attached are the original quiz and the IDEAl solution assignment; your IDEAl solution answer can serve as corrections for the back page of the quiz, so you need not do both.

I do want to emphasize on the IDEAl solutions that you need to justify your formulas, if even briefly. You are being asked to calculate twelve values (Q, W and change in S for each of the 4 processes of a Carnot cycle); many are zero and the rest use formulas you can find in the text. You should be able to justify in a few words why each is applicable. For instance, if a process were isochoric you should know right away that W=0. Write something like, “W=0 because there is no volume change, and W=-integral (p dV)” Or if a process were isobaric, you should write, “W=-p(V_2-V1) (isobaric process)” rather than simply writing the formula alone. This is what I mean by justifying your use of a formula – by identifying in a few words the relevant physics of the situation. You have a bunch of formulas for work; you need to make it clear why you chose the one you did!

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