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A system gives out 150 J as heat while 400 J of work is done on it. What is ΔU?
A+550 J
B+250 J
C-550 J
D-250 J
Answer & Solution
Correct answer: B. +250 J
With q = -150 J and w = +400 J, ΔU = q + w = +250 J.
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