Positive and Negative Signs 8.21

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Ammarah 2H
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

Positive and Negative Signs 8.21

Postby Ammarah 2H » Wed Jan 24, 2018 12:29 pm

For questions like 8.21 on the homework, how do we know which side will be positive and which will be negative? Is the one with the lower initial temperature always the negative one?

SantanaRodriguezDis1G
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am

Re: Positive and Negative Signs 8.21

Postby SantanaRodriguezDis1G » Wed Jan 24, 2018 3:13 pm

it doesn't matter which side has the negative. either way it would turn out to be the same answer

Brigitte Phung 1F
Posts: 50
Joined: Thu Jul 27, 2017 3:00 am
Been upvoted: 1 time

Re: Positive and Negative Signs 8.21

Postby Brigitte Phung 1F » Wed Jan 24, 2018 4:27 pm

I think it would also help to look at it in terms of the objects themselves. q is positive when heat has been absorbed by the system, whereas q is negative when heat has flowed from the system. Hope this helps!

Meredith Steinberg 2E
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Positive and Negative Signs 8.21

Postby Meredith Steinberg 2E » Wed Jan 24, 2018 4:55 pm

It ends up not mattering which side gets the negative. What's important to know (as seen in the solutions manual) is that
heat lost=-(heat gained).


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