What is change in internal energy system does $140 \mathrm{KJ}$ of work on surrounding and $40 \mathrm{~kJ}$…

What is change in internal energy system does $140 \mathrm{KJ}$ of work on surrounding and $40 \mathrm{~kJ}$ of heat is added to system?
  1. $-200 \mathrm{~kJ}$
  2. $-180 \mathrm{~kJ}$
  3. $-100 \mathrm{~kJ}$
  4. $-280 \mathrm{~kJ}$

Solution

$\begin{aligned} & \Delta \mathrm{E}=\delta \mathrm{W}+\delta \mathrm{Q} \\ & =-140+40=-100 \mathrm{KJ}\end{aligned}$

Asked in: MHT CET 2022 (07 Aug Shift 2)

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