A) 18J
B) 9J
C) 4.5J
D) 36J
Correct Answer: A
Solution :
| [a] Given \[\Delta Q=-20J,\] \[\Delta W=-8J\]and \[{{U}_{1}}=30J\] |
| \[\Delta Q=\Delta U+\Delta W\]Þ \[\Delta U=(\Delta Q-\Delta W)\] |
| Þ \[({{U}_{f}}-{{U}_{i}})\]= \[({{U}_{f}}-30)=-20-(-8)\] Þ\[{{U}_{f}}=18J\] |
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