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## Homework Statement

A small ball with a mass of 3.0kg revolves uniformly in a circle on a frictionless horizontal surface. The ball is attached to a string of 1.40m to a pin set at center of circle. The object makes 2rev/sec.

a)find the centripetal accel

b)find the tension exerted on the string

## Homework Equations

ac=v^2/r

Fc= ma=m(4pi^2r/T^2)

T= .5

## The Attempt at a Solution

if its uniform wouldn't the Fc=FT(force of tension)

T would =.5 because 2 rev/1 sec?

I am not sure how to find centripetal accel because i do not know how to find the velocity unless i am missing something..

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