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Homework Statement
http://www.youtube.com/watch?v=W1TMZASCR-I&feature=related
Why does this happen?
Homework Equations
The Attempt at a Solution
I think it's because of the conservation of angular momentum moving the cans, but I'm still confused as to why the angles between the metronomes must be approximately equal after a short amount of time. I understand that it has to do with coupling effects and that they transfer energy in between the metronomes, but I'm having difficulty finding what coupling actually means.