8.13


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Samira 2B
Posts: 38
Joined: Fri Sep 29, 2017 7:05 am

8.13

Postby Samira 2B » Mon Jan 15, 2018 5:47 pm

For this problem, why is the heat added (947 kJ) negative? I thought when you add heat to a system it is supposed to be positive?

Nishma Chakraborty 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: 8.13

Postby Nishma Chakraborty 1J » Mon Jan 15, 2018 6:18 pm

Hey!

So, I think it's -947 kJ because the cylinder itself isn't absorbing the heat (then it would be +947 kJ), but rather the cooling system around it is absorbing the heat. Basically, the cylinder is giving off the heat (thus -947 kJ) that the cooling system absorbs. The wording is tricky!

Hope this helps! :)

204918982
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: 8.13

Postby 204918982 » Fri Jan 19, 2018 2:06 pm

The cylinder itself is losing energy so the heat is negative


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