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The Other, Other Rope Around The Earth Problem - 2015/08/01
There's a classic problem:
If we consider the centres of mass of the Earth and the ring of steel, we can consider what happens when the ring is off centre. The two centres of mass will surely be attracted, so surely the ring floats back to be centred, doesn't it?
Or does it? We know that we can't always replace objects with a point mass at their centre of mass, and maybe this is one of those cases.
So what does happen?
I've decided no longer to include comments directly via the Disqus (or any other) system. Instead, I'd be more than delighted to get emails from people who wish to make comments or engage in discussion. Comments will then be integrated into the page as and when they are appropriate.
If the number of emails/comments gets too large to handle then I might return to a semi-automated system. That's looking increasingly unlikely.
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