Which statement below regarding the first law of thermodynamics is most correct?
A. A system can do work externally only if its internal energy decreases.
B. The internal energy of a system that interacts with its environment must change.
C. No matter what other interactions take place, the internal energy must change if a system undergoes a heat transfer.
D. The only changes that can occur in the internal energy of a system are those produced by non-mechanical forces.
E. The internal energy of a system cannot change if the heat transferred to the system is equal to the work done by the system.
Answer: E
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