Problem 4B.1) 7th edition

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Katie Frei 1L
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Joined: Fri Sep 28, 2018 12:27 am

Problem 4B.1) 7th edition

Postby Katie Frei 1L » Wed Feb 06, 2019 4:16 pm

In problem 4B.1 of the 7th edition of the textbook, it says that a piston compresses the gas, doing 340 kJ of work. Does this mean that the value of work is positive rather than negative?

Amy Lefley 1J
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: Problem 4B.1) 7th edition

Postby Amy Lefley 1J » Wed Feb 06, 2019 11:03 pm

Yes, the work is positive because work is being done on the system and not by the system, so the system gains energy.

gwynlu1L
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Problem 4B.1) 7th edition

Postby gwynlu1L » Fri Feb 08, 2019 3:15 am

typically, compression will have a positive work value since work is being done on the system to compress it. Expansion will typically have a negative work value bc the system has to put in energy in order to work against the surroundings and push the piston up.


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