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First Law of Thermodynamics

A system does...

Question

A system does $200 J$ of work and at the same time absorbs 150 $J$ of heat. The magnitude of the change in internal energy in $J$ is (Nearest integer)

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Solution

$Δ U = q + w$ (according first law of thermodynamics)
$Δ U = 150 - 200 Δ U = - 50 J$
Magnitude is 50

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