Question
Question: A system absorbs 50 kJ heat and does 20 kJ of work. What is the net change in the internal energy of...
A system absorbs 50 kJ heat and does 20 kJ of work. What is the net change in the internal energy of the system?
A
Increase by 30 kJ
B
Decrease by 30 kJ
C
Increase by 70 kJ
D
Decrease by 70 Kj
Answer
Increase by 30 kJ
Explanation
Solution
: ΔU=dq+(−W)=50+(−20)=30kJ