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Physics Question on Thermodynamics

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 internal energy of the system increase is

A

500 W

B

600 W

C

800 W

D

1200 W

Answer

800 W

Explanation

Solution

From 1st law of thermodynamics,
š‘‘š‘„ = š‘‘š‘ˆ +š‘‘š‘Š
Also, we can write this as, š‘‘š‘„/š‘‘š‘” = š‘‘š‘ˆ/š‘‘š‘” + š‘‘š‘Š/š‘‘š‘”
āŸ¹ 1000š‘Š = š‘‘š‘ˆ š‘‘š‘” + 200š‘Š
āŸ¹ š‘‘š‘ˆ š‘‘š‘” = 800W