- #1

- 7

- 0

## Main Question or Discussion Point

Hello All, I am interpreting a diagram from the following question.

(I didnt have a chance to take thermo and I learned it by myself so I might have some problems)

http://www.physicsgrad.com/pgre/9677-15

I understand that I can just do ΔW and I get the right answer,

but upon doing it with the specific heats, I am a little confused.

The isobaric process (B->C) specifically:

I looked at this solution:

http://grephysics.net/ans/9677/15

Why, in the calculation of U, is there C_v present?

I thought the pressure was constant, and the volume changes,

then why is U = C_v(ΔT)??

Any advise appreciated.

(I didnt have a chance to take thermo and I learned it by myself so I might have some problems)

http://www.physicsgrad.com/pgre/9677-15

I understand that I can just do ΔW and I get the right answer,

but upon doing it with the specific heats, I am a little confused.

The isobaric process (B->C) specifically:

I looked at this solution:

http://grephysics.net/ans/9677/15

Why, in the calculation of U, is there C_v present?

I thought the pressure was constant, and the volume changes,

then why is U = C_v(ΔT)??

Any advise appreciated.