In a thermodynamic process, the internal energy of a system in a container with adiabatic walls decreases by 800 J. Which statement is correct?
A. The system lost 800 J by heat transfer to its surroundings.
B. The system gained 800 J by heat transfer from its surroundings.
C. The system performed 800 J of work on its surroundings.
D. The surroundings performed 800 J of work on the system.
E. The 800 J of work done by the system was equal to the 800 J of heat transferred to the system from its surroundings.
Answer: C
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