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A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W, the rate at which the internal energy of the system increases is

Asked in JEE Main 6th April 1st Shift 2023 · First Law and Sign Convention

Answer: (2) 800 W

Step-by-step solution

First law as a rate equation: (dQ)/(dt)=(dU)/(dt)+(dW)/(dt).

(dU)/(dt)=1000-200=800 W.

Why the other options are wrong

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