Midterm Q5


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Rachel Brown 3A
Posts: 52
Joined: Fri Sep 29, 2017 7:06 am

Midterm Q5

Postby Rachel Brown 3A » Fri Mar 16, 2018 1:00 pm

On the solutions for the midterm, it says that after solving for work = -158, delta u = +158. Why is this the case? Even though work=delta u if q=0

Jonathan Tangonan 1E
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: Midterm Q5

Postby Jonathan Tangonan 1E » Fri Mar 16, 2018 2:42 pm

It is +158J because it returns back to the original internal energy. Delta U in step 1 is -158J so in order to return to its original internal energy in step 2 it must be +158J.

Michael Downs 1L
Posts: 29
Joined: Thu Jul 13, 2017 3:00 am

Re: Midterm Q5

Postby Michael Downs 1L » Fri Mar 16, 2018 10:00 pm

work=-delta U

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