- #1

Elatric

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## Homework Statement

A boy ties a rock to a 0.95 m string and swings it in a horizontal circle directly over his head so that it completes one revolution every 0.75 s. What is the tension in the string?

So we know r and we can calculate V, but that's all I can deduce

## Homework Equations

Fc=(mv^2)/r

V=(2*pi*r)/t

## The Attempt at a Solution

2*pi*.95/.75= 7.9587 m/s

That's how far I got. I know the masses cancel with ma=mv^2/r but then I end up finding the acceleration. Help?