Change in internal energy


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Ryan Danis 1J
Posts: 66
Joined: Fri Sep 28, 2018 12:18 am

Change in internal energy

Postby Ryan Danis 1J » Wed Jan 30, 2019 4:12 pm

How do I calculate the change in internal energy of a system if the amount of heat transferred is not given? (7th edition 4A.3 part c)

Aria Soeprono 2F
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Re: Change in internal energy

Postby Aria Soeprono 2F » Wed Jan 30, 2019 6:11 pm

The internal energy of a system does not necessarily mean heat, it can also be referring to work, because U= heat + work. Therefore, in 4A. 3 (c), delta U is equal to the amount of work done, which is 28 J.

Ryan Danis 1J
Posts: 66
Joined: Fri Sep 28, 2018 12:18 am

Re: Change in internal energy

Postby Ryan Danis 1J » Thu Jan 31, 2019 12:39 pm

So the answer is 28J! The back of the book said the answer was 8J so it must be a typo, no wonder I was so confused. Thanks for your explanation!

Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

Re: Change in internal energy

Postby Mya Majewski 1L » Thu Jan 31, 2019 2:42 pm

Have we even went over internal energy in class yet (Delta U)?


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