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Change in internal energy

Posted: Wed Jan 30, 2019 4:12 pm
by Ryan Danis 1J
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)

Re: Change in internal energy

Posted: Wed Jan 30, 2019 6:11 pm
by Aria Soeprono 2F
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.

Re: Change in internal energy

Posted: Thu Jan 31, 2019 12:39 pm
by Ryan Danis 1J
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!

Re: Change in internal energy

Posted: Thu Jan 31, 2019 2:42 pm
by Mya Majewski 1L
Have we even went over internal energy in class yet (Delta U)?