## energy change due to work

Shelbyhamilton 3H
Posts: 37
Joined: Fri Sep 26, 2014 2:02 pm

### energy change due to work

in hw question 7.9, the q is given as 5500 kj. the change in internal energy ends up being 5500kj as well, so therefore we can assume that the energy change due to work is negligible. But I am just wondering if we would need to write 0 for this on an exam, or just say that its negligible?

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

### Re: energy change due to work

When calculated, work is not equal to zero; it's just a really small number compared to the energy gained as heat. Due to significant figures, the change in internal energy ends up being the same value as the energy added as heat, but the system is still doing some work. Therefore I would say the energy change due to work is negligible, not zero.