# Angular velocity and bicycle wheel

1. Nov 16, 2007

### JoeSouthern

I am a little stuck with angular velocity and I do not know where to start on this one question.

A bicycle wheel has a diameter 60 cm. Determine its angular velocity in radians per seconds, when the bicycle travels at 20km/h

Very much appreciated.

2. Nov 16, 2007

### Dick

You have to start. The speed of the bicycle determines the linear velocity of the rim relative to the center. Now find a relation between that and angular velocity.

3. Nov 17, 2007

### HallsofIvy

Staff Emeritus
Can you find the circumference of the wheel? If the wheel turns x times, how far does the bicycle go?

4. Nov 17, 2007

### katchum

If I would drive 5 meters with my bicycle, then you could imagine that you will make the same path on the circumference of the wheel. Imagine your tires being stretched out flat on the road.