# Circular motion of two wires and a ball

1. Feb 25, 2005

### flyguyd

circular motion!!!

two wires are tied to a 200g ball. the ball revolves in a horizontal circle at a constant speed of 7.5 m/s. what is the tension in each wire.

|
|'
| '
| '
| 'O
| '
| '
|'
|

2. Feb 25, 2005

### Staff: Mentor

The top wire must support the ball, so there will be a vertical vector force in opposition to gravity.

The ball is rotation, so calculate the horizontal component $\ifrac{mv^2}{r}$. Each wire then provides half of the centripetal force, assuming they are of equal length.

The tension in each wire found by the vector sum of horizontal and vertical components.