A system absorbs \( 100 \mathrm{~kJ} \) heat in the process P shown...

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A system absorbs \( 100 \mathrm{~kJ} \) heat in the process
P shown in the figure. What is \( \Delta \mathrm{U} \) for the system?

W
(1) \( -50 \mathrm{~kJ} \)
(2) \( +50 \mathrm{~kJ} \)
(3) \( +150 \mathrm{~kJ} \)
(4) \( -150 \mathrm{~kJ} \)
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