# Circular motion: ring on string

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1. Jan 12, 2017

### Faiq

1. The problem statement, all variables and given/known data

2. Relevant equations
F = mw^2r

3. The attempt at a solution
For part a, I cant get the constant of half with the tan a
I am getting tan a = w^2l/g

2. Jan 12, 2017

### BvU

Post your work. What force do you use to compensate $mg$ ?

3. Jan 12, 2017

### Staff: Mentor

Show how you got that.

4. Jan 12, 2017

### Delta²

Think carefully what is the total force acting in the y-axis on the ring. Its not $T\cos{a}-mg$ as you probably think. It is rather $T(1+\cos{a})-mg$ (why??)

5. Jan 14, 2017

### Faiq

I did it thanks guys