Quote:
Originally posted by jaguar
I think the second(?) law or thermodymanics would kick in around there...
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The second law of thermodynamics states that the entropy of a closed system always increases.
Actually, no thermodynamics law directly dictates that perpetual motion isn't possible.
If you try to build a thermodynamic cycle that is ideal, i.e. is the most efficient, you get what is called a Carnot cycle. Everything that is more efficient than that is banned from existence.
My gedanken experiment with two coffee cups and two engines is such a case. :p