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The internal energy change in a system that has absorbed $2 \mathrm{k}$ cal of heat and done $500 \mathrm{~J}$ of work is :
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$7900 \mathrm{~J}$
$\mathrm{dU}=\mathrm{Q}-\mathrm{W}=8400-500=7900 \mathrm{~J}$
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