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First Law of Thermodynamics

A gas taken i...

Question

A gas taken in a cylinder fitted with an easily movable piston, is heated using a burner. The heat energy given to the gas is 10J. In this case, 5J of work was done on the system. What is the change in internal energy?

A

-5 J

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B

5 J

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C

10 J

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D

15 J

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Solution

The correct option is D 15 J
$Δ U = Q + W$
=10+5=15 J

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