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Question

# A heat engine undergoes a process in which its internal energy decreases by 400 J and it gives out 150 J of heat. During the process:

A

it does 250 J of work and its temperature falls

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B

it does 550 J of work and its temperature rises

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C

it does 250 J of work and its temperature rises

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D

it does 550 J of work and its temperature falls

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Solution

## The correct option is A it does 250 J of work and its temperature falls The internal energy of the system will decrease when the system does work and/or gives off heat. Since the heat given out is 150 J and the reduction in internal energy is 400 J, the work done by the engine is 400 -150 = 250 J. When the internal energy is reduced, the system is cooled.

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