Question

If 400 kJ work is done by the system and 150 kJ
heat is given to system then what will be effect on
internal energy?
(1) Increases by 250 kJ. (2) Decreases by 250 kJ
(3) Increases by 600 kJ (4) Decreases by 600 kJ​

Answer 1

Let U be the total internal energy

When 400kJ work is done, internal energy becomes (U-400)kJ

When 150kJ heat is given, internal energy becomes U-400+150=U-250

Hence the internal energy decreases by 250

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Answer 2

Explanation:

the internal energy is decreased by 250kj