physics
posted by Sasha .
a .45kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. if the cord will break when the tension in it exceeds 75 N, what is the maximum speed the ball can have?

75=mv^2/r
solve for v. 
The answer is actually 14.72 m/s :)
(the square root of 1.3*75/.45 = 14.72)