Leaning Tower of Pisa
Given the fact that the Leaning Tower of Pisa is increasing its lean
1/20 every year how long will it take before it topples over?
It will topple when the center of mass gets to the edge of its base.
If we knew the location of the center of mass (about half way up)
and could determine how much further it needed to twist, we could
make an estimate, but we would be assuming that the increase would
be the same each year. It will be much more in the last few years.
samuel p bowen
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Update: June 2012