MCQ
A system does $200\,J$ of work and at the same time absorbs $150 \,\mathrm{~J}$ of heat. The magnitude of the change in internal energy is $.....\,J.$ (Nearest integer)
- ✓$50$
- B$55$
- C$60$
- D$40$
✓
Answer
Correct option: A.
$50$
a
$w=-200\, J, q=+150: \Delta U=q+w$
$w=-200\, J, q=+150: \Delta U=q+w$
$\Delta U=150-200=-50\, \mathrm{~J}$
$\text { magnitude }=50 \,\mathrm{~J}=|\Delta \mathrm{U}|$
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