問題詳情

7. A gas sample is heated in a cylinder, using 375KJ of heat. At the same time a piston compresses the gas, using 645KJ of work. What is the change in internal energy of the gas during this process?
(A)1020KJ
(B)270KJ
(C)1.72KJ
(D)500KJ
(E)30KJ

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