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Olin [163]
3 years ago
8

What is the change in internal energy if 20 J of heat is released from a system and the system does 50 J of work on the surround

ings?
a. -70 j
b. 30 j
c. -30 j
d. 70 j
Physics
2 answers:
viva [34]3 years ago
8 0

OPTION - A

Change in energy given by :-

dQ = du + dw

dQ = -20 - (-50)

dQ = -70

siniylev [52]3 years ago
7 0
Answer is A.

Both energy changes describe energy be lost from the system (in different forms - as heat or as work). The negative sign indicates loss.
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Working...

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Explanation:

The only thing I found in my notes for this question was this although it isn't in your choices, I just hope this helps you and hope you get it right!

7 0
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