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A system absorbs 50 kJ heat and does 20 ...

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

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaU=q+(-w)=50+(-20)=30kJ`
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