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[Phys-l] Why soldiers break step on small bridges, and not so small.



Scientist: Tae Bo workout sent skyscraper shaking – This Just In - CNN.com Blogs


bc


p.s. It is a "real" problem:

Angers Bridge - Wikipedia, the free encyclopedia

p.p.s Anyone seen the film loop of a demonstration of the normal modes of a foot bridge?

This is all I could find -- is the one I remember.


Resonant Bridge Video Clips