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Question

If 400kJ work is done by the system and 150kJ heat is given to system then what will be affect on internal energy?

A
Increases by 250kJ
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B
Decreases by 250kJ
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C
Decreases by 600kJ
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D
Increases by 600kJ
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Solution

The correct option is B Decreases by 250kJ
U=QW work done by the system is positive
=150400
=250KJ heat is given to the system is positive
U decreases by 250KJ

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