Thermodynamics Question 266
Question: There are two processes ABC and DBF. In which of the process is the amount of work done by the gas greater?
Options:
A) ABC
B) DEF
C) Equal in both processes
D) It cannot be predicted
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ W _{ABC}=\frac{\pi r^{2}}{2}=\frac{\pi {{(6)}^{2}}}{2}=18\pi $
$ W _{DEF}=\frac{\pi \times 3^{2}}{2}+\frac{\pi \times 3^{2}}{4}+( 15-12 )\times 18 $
$ =6.75\pi +54 $
$ W _{DEF}>W _{ABC} $
