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Given the following question: enter image description here

could someone explain how A is correct and D is wrong? I'm a little confused. Since its a closed cycle shouldnt there be no energy lost?

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A and D are ambiguous. Your interpretation, that "energy lost or gained" means overall change in internal energy, does indeed lead to A being wrong and D being right. I suppose that another interpretation might be that the gas loses energy in the form of heat, equal to the work done on it over the cycle, leading to A being right and D being wrong. Not your fault.

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  • $\begingroup$ Oh, ok! That explains it :) $\endgroup$
    – Melanie
    Apr 22, 2018 at 22:23

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