Thermodynamics Question 234
Question: If the amount of heat given to a system is 35 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is
Options:
A) -50 J
B) 20 J
C) 30 J
D) 50 J
Show Answer
Answer:
Correct Answer: D
Solution:
[d] According to first law of thermodynamics $ \Delta Q=\Delta U+\Delta W $
$ \Delta U=\Delta Q-\Delta W $
$ \Delta Q=35J,\Delta W=-15J $
$ \Delta U=35J-( -15J )=50J $
