A sample of an ideal gas is taken through a cycle a shown in figure. It absorbs $$60J$$ of energy during the process AB, no heat during BC, rejects $$70J$$ during CA. $$40J$$ of work is done on the gas during BC. Internal energy of gas at A is $$1500J$$, the internal energy at C would be

Question

Infinity Learn · Accepted Answer

Δ$$WAB=0$$ as $$V=$$ constant ∴Δ$$QAB=$$Δ$$UAB=60J$$     (Given) $$UA=1500J$$∴$$UB=(1500+60)J=1560J$$Δ$$WBC=$$−Δ$$UBC=$$−$$40J$$  (Given) ∴Δ$$UBC=40J$$∴$$UC=(1550+40)J=1590J$$

A sample of an ideal gas is taken through a cycle a shown in figure. It absorbs 60J of energy during the process AB, no heat during BC, rejects 70J during CA. 40J of work is done on the gas during BC. Internal energy of gas at A is 1500J, the internal energy at C would be

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