In a thermodynamic process, a system absorbs 2 kilo calorie of heat and at the same time does 500 J of work. What is the change in internal energy of the system:

In a thermodynamic process, a system absorbs 2 kilo calorie of heat an

1.	In a thermodynamic process, a system absorbs 2 kilo calorie of heat and at the same time does 500 J of work. What is the change in internal energy of the system:
Answer» `-500 J` 500 J 7900 J 8900 J Solution :Since `DQ=dU+dW` `therefore dU =dQ-dW` Here `dQ =2000" CAL. "=2000xx4 CDOT 2=8400 J and dW=500 J` `therefore dU =8400 -500=7900 J` THUS, correct choice is (c ).

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In a thermodynamic process, a system absorbs 2 kilo calorie of heat and at the same time does 500 J of work. What is the change in internal energy of the system:

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