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## Homework Statement

Consider the figure below, a ball of mass m=0.100 kg tied by a string of 0.100 m travels in a circular motion with 2 revolutions per second. Find the angle θ that keeps the ball stationary.

Given: m = 0.100 kg, v = 2 rev/sec L = 0.100 m (radius?)

[PLAIN]http://img192.imageshack.us/img192/9518/unledrht.jpg [Broken]

## Homework Equations

F

_{C}= [itex]\frac{mv^{2}}{r}[/itex]

## The Attempt at a Solution

Let T be the tension force.

y: Tcosθ - mg = 0

x: Tsinθ = mv

^{2}/r

The problem is I am not sure if the setup above is right, and should I take the length of the string as the radius? or rsinθ?

Hope you guys can help me, thank you very much, I will be extremely appreciated!!

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