What is change in internal energy when system releases $8 \mathrm{~kJ}$ of heat and performs $660…

What is change in internal energy when system releases $8 \mathrm{~kJ}$ of heat and performs $660 \mathrm{~J}$ of work on the surrounding?
  1. $-7340 \mathrm{~J}$
  2. $-5400 \mathrm{~J}$
  3. $-8660 \mathrm{~J}$
  4. $-1212 \mathrm{~J}$

Solution

$\Delta \mathrm{U}=\mathrm{Q}+\mathrm{W}=-8000 \mathrm{~J}-660 \mathrm{~J}=-8660 \mathrm{~J}$

Asked in: MHT CET 2023 (10 May Shift 1)

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