8.7


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veneziaramirez 3I
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Joined: Fri Sep 29, 2017 7:07 am

8.7

Postby veneziaramirez 3I » Sun Jan 14, 2018 11:47 pm

Why is 982 delta U? Wouldn’t it be 982J- 492J? Aren’t work and delta U the same thing as according to 8.3 c?

Sophie Krylova 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:06 am

Re: 8.7

Postby Sophie Krylova 2J » Mon Jan 15, 2018 9:27 am

I haven't looked at the problem specifically, but dU is not just work. dU = w + q (q is heat)

Nancy Dinh 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

Re: 8.7

Postby Nancy Dinh 2J » Mon Jan 15, 2018 1:08 pm

veneziaramirez 3I wrote:Why is 982 delta U? Wouldn’t it be 982J- 492J? Aren’t work and delta U the same thing as according to 8.3 c?


The internal energy of a system is delta U, so delta U is given at 982 J. The equation is delta U = w + q, where heat is given at +492 J, so 982J - 492J will give you how much work is done.

Delta U and work are only equal when q=0 where no heat is absorbed or released. In Exercise 8.3, there is no change in temperature.


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