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...the length of the meniscus on the outside of the toroid is longer
than the length of the meniscus on the inside. But the height of the
meniscus is the same everywhere, to a more-than-sufficient
approximation. So there's more total force on the outside.
....
It appears that some energy (force times distance) was imparted to the tube
when it rotated, but this energy did not come from the water in any obvious
way, because the water is in the same state before and after the rotation.
That's impossible. The foregoing analysis must be wrong (or at best
incomplete). So what is really going on here?....
Acknowledgement: I got this from Richard Feynman, and I believe it was
original with him.