A system absorbs \( 20 \mathrm{~kJ} \) heat and does \( 10 \mathrm{...

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A system absorbs \( 20 \mathrm{~kJ} \) heat and does \( 10 \mathrm{~kJ} \) of
\( \mathrm{P} \) work. The internal energy of the system

W
(1) Increases by \( 10 \mathrm{~kJ} \)
(2) Decreases by \( 10 \mathrm{~kJ} \)
(3) Increases by \( 30 \mathrm{~kJ} \)
(4) Decreases by \( 30 \mathrm{~kJ} \)
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