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A gas is compressed at a constant pressure of 50N m^-2 from a volume 10m³ to a volume of 4m³. 100J of heat is added to the gas then its internal energy is

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Increases by 400J

Increases by 200J

Decreases by 400J

Decreases by 200J

answer is A.

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Detailed Solution

dW=50(4-6)=-300J

$dQ = 100 J$

dU=dQ-dW=400J

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