#1
Oct803, 08:55 PM

P: n/a

God, I'm getting so frustrated.
A 0.50kg ball that is tied to the end of a 1.5m light cord is revolved in a horizontal plane with the cord making a 30 degree angle with the vertical. a) what is the ball's speed. Now, I drew my little diagram, solved for the force of tension (got 5.66N). I plug that in for my Centripetal Force in Centripetal Force = mv^2/r, solve for v, and got 4.1 . The book gets like, 2.1. I'm getting so frustrated right now...let me know if you can help. Thanks. 



#2
Oct903, 05:28 AM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,881

Did you forget to take the SQUARE ROOT???



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