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A system rejects 1500 J of heat to its surroundings and also performs 2200 J of work on its surroundings. What is the change in the internal energy of the system?

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$- 3700 J$

$+ 3700 J$

$+ 700 J$

$- 700 J$

answer is C.

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Detailed Solution

$d Q = d U + d W$
$- 1500 = d U + 2200$
$d U = - 3700 J$

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