The diagram shows a cycle undergone by a portion of helium gas. Find the efficiency of that cycle.
We received a large number of solutions to our November Challenge Born to turn. We are pleased to recognize the following contributors:
Guidelines for contributors
Many thanks to all contributors and we hope to hear from many more of you in the future!
Note: as always, we would very much appreciate reader-contributed original Challenges.
Boris Korsunsky, Column Editor
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