The internal energy change in a system that has absorbed $2 \mathrm{k}$ cal of heat and done $500…

The internal energy change in a system that has absorbed $2 \mathrm{k}$ cal of heat and done $500 \mathrm{~J}$ of work is :
  1. $7900 \mathrm{~J}$
  2. $8900 \mathrm{~J}$
  3. $6400 \mathrm{~J}$
  4. $5400 \mathrm{~J}$

Solution

$\mathrm{dU}=\mathrm{Q}-\mathrm{W}=8400-500=7900 \mathrm{~J}$ /

Asked in: NEET 2009 (Mains)

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