Ball on a string (vertical circle)

  • #1

Homework Statement


a 500 g ball moves in a verticle circle on a 1.01 m long string. if the speed at the top is 4.3 m/s, then the speed at the bottom will be 7.62 m/s. what is the tension of the string when the ball is at the top? when is the tension of the string when the ball is at the bottom?


Homework Equations


tension = (Fnet)=mv2/r


The Attempt at a Solution


top:
tension = (Fnet)=(0.5 kg)(4.3)2/(1.01) = 9.15 N

bottom:
tension = (Fnet)=(0.5 kg)(7.62)2/(1.01) = 28.7 N

these answers are wrong, however. and i'm not exactly sure why.
pointers in the right direction would be much appreciated!
 

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