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A system takes in 400 J of heat and does 100 J of work. Its internal energy therefore changes by:
A100 J
B400 J
C300 J
D500 J
Answer & Solution
Correct answer: C. 300 J
1. Heat added raises the internal energy by 400 J.
2. Work done by the system removes 100 J from it.
3. 400 minus 100 leaves a rise of 300 J.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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