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Apr 13, 2017 at 12:39 history edited CommunityBot
replaced http://physics.stackexchange.com/ with https://physics.stackexchange.com/
Aug 12, 2015 at 22:45 comment added Floris Rather belatedly I have attempted to bring some mathematics to the problem. See if my recent answer gives some new insights.
Aug 11, 2015 at 0:58 comment added Selene Routley @Floris Yes, of course, a two piece system of rigid rod and ball would be much easier to analyse. Brain asleep this morning!
Aug 11, 2015 at 0:52 comment added Floris I will have to think about this. I believe the string is itself rigid so the bob is rotating even when the string is pointing straight down. But it's an unstable equilibrium, which should not be too hard to prove. Not the stuff of cell phones though.
Aug 11, 2015 at 0:42 history edited Selene Routley CC BY-SA 3.0
added 7 characters in body
Aug 11, 2015 at 0:35 history answered Selene Routley CC BY-SA 3.0