A) 560 J
B) 800 J
C) 600 J
D) 640 J
Correct Answer: A
Solution :
[a] By the graph, \[{{W}_{AB}}=0\]and \[{{W}_{BC}}=8\times {{10}^{4}}[5-2]\times {{10}^{-3}}=240J\] \[\therefore {{W}_{AC}}={{W}_{AB}}+{{W}_{BC}}=0+240=240J\]Now, \[{{Q}_{AC}}={{Q}_{AB}}+{{Q}_{BC}}=600+200=800J\] From the first law of thermodynamics, \[{{Q}_{AC}}=\Delta {{U}_{AC}}+{{W}_{AC}}\] \[\Rightarrow 800=\Delta {{U}_{AC}}+240\]or \[\Delta {{U}_{AC}}=560J\]You need to login to perform this action.
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