# Tether ball problem (Forces)

1. Oct 23, 2009

### Charanjit

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

A tether ball leans against the post to which it is attached. The string is attached to the ball such that a line along the string passes through the center of the ball. The string to which the ball is attached has length 1.50 m and the ball's radius is 0.108 m and has a mass of 0.275 kg . Neglect any friction between the ball and the pole.

2. Relevant equations

F=ma
A=v^2/r
F=mv^2/r

3. The attempt at a solution

Have a free body diagram, but have no clue where to start.

2. Oct 23, 2009

### Bill Foster

What is the question?

3. Oct 23, 2009

### Charanjit

Woops, sorry.

First question: What is the tension in the rope?
Second: What is the force the pole exerts on the ball?

4. Oct 24, 2009

### Bill Foster

Start by labeling the forces on the free body diagram.

5. Oct 24, 2009

### Charanjit

Ok I got the first question figured out, need help with the second one.

6. Oct 24, 2009

### Charanjit

I had help and worked out the second part which asks what is the force that the pole exterts on the ball, and I got 0.194. But my online system doesn't accept, maybe its wrong. Can someone confirm?

7. Oct 24, 2009

### Bill Foster

Work it out here.

8. Oct 25, 2009

### Charanjit

Nevermind, had my instructor explain it.