# Mini-Golf Windmill

1. Oct 22, 2012

### pmd28

1. The problem statement, all variables and given/known data
A golf ball passing through a windmill at a miniature golf course. The windmill has 6 blades and rotates at an angular speed of 1.65 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball (diameter 4.50x10-2 m) has just reached the edge of one of the rotating blades (see the drawing). Ignoring the thickness of the blades, find the minimum linear speed with which the ball moves along the ground, such that the ball will not be hit by the next blade.

2. Relevant equations
ω=θ/t
v=m/s

3. The attempt at a solution
I don't know how to start this. I drew out a picture and I still can't see how I can relate the equations.

2. Oct 22, 2012

### Angry Citizen

What must the ball do in the problem in order to satisfy the condition specified?

3. Oct 22, 2012

### pmd28

Go through the hole.

4. Oct 22, 2012

### Angry Citizen

Bit more specific.

5. Oct 22, 2012

### pmd28

Go through the hole without getting hit by the windmill?

6. Oct 22, 2012

### pmd28

Oh, pfft. The golf ball has to go through the hole without getting hit by the windmill with it's slowest possible velocity.