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July 31, 2014

Homework Help: physics

Posted by physics on Tuesday, August 11, 2009 at 10:35am.

ok a person is holding onto a piece of string

at the end of the string is a ball

the person whrils it around in a circle

i've been asked what's the mininum value of at the top of the circle (this is swung around in a verticle circle) what is the mininum value the velocity could be to keep it moving in a circle

ok i found it my only question is why is the speed at the bottom given as twice the mininum speed at the top

then from there it says solv efor the force of tension at the bottom which i know how to do once i know why i can multiply the minninum speed at the top by two

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