A) 140 J
B) 70 J
C) 40 J
D) none of these
Correct Answer: B
Solution :
Key Idea: Energy is conserved acccording to first law of thermodynamics. From first law of thermodynamics, if an amount of heat Q is given to a system, a part of it will be used in increasing the internal energy \[(\Delta U)\] of the system and rest in doing work (W) by the system. \[Q=\Delta U+W\] \[\Rightarrow \] \[-W=\Delta U-Q\] Given, \[\Delta U=40\,J,\,Q=110\,J\] \[\therefore \] \[W=-(40-110)=+70\,J\]You need to login to perform this action.
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