A system is provided with \( 200 \mathrm{cal} \) of heat and the work done by the system on the ...

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A system is provided with \( 200 \mathrm{cal} \) of heat and the work done by the system on the surroundings is \( 40 \mathrm{~J} \). Then, its internal energy
(a) increases by \( 600 \mathrm{~J} \)
(b) decreases by \( 800 \mathrm{~J} \)
(c) increases by \( 800 \mathrm{~J} \)
(d) decreases by \( 50 \mathrm{~J} \)
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