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  4. A system absorbs reversibly 600 J of heat and preforms 250 J of work. The increase in the internal energy of system is

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Q. A system absorbs reversibly $ 600\,\,J $ of heat and preforms $ 250\,\,J $ of work. The increase in the internal energy of system is

Rajasthan PMTRajasthan PMT 2011

Solution:

According to first law of thermodynamics $ \Delta U=q+W $ As heat is absorbed by the system, $ q=+q $ and work is done by the system, $ w=-W $ $ \therefore $ $ \Delta U=q-W $ $ =600-250 $ $ =350\,\,J $