# Angular velocity help

1. Aug 8, 2010

### Sheen91

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

[PLAIN]http://img707.imageshack.us/img707/2066/question3.jpg [Broken]

2. Relevant equations

v = r' $$\hat{r}$$ + r*θ' (^θ)

3. The attempt at a solution

I was sure I knew how to do this question but made a mistake somewhere, because my answer is not right. So here is my working out.

l r' l = 11mm/s
Θ' = ?
r = 78mm

Looking at the question above.

[PLAIN]http://img20.imageshack.us/img20/8729/lolbo.jpg [Broken]

Last edited by a moderator: May 4, 2017
2. Aug 9, 2010

### ehild

Re: Velocity

The angular velocity is usually given in radian/s. Check the answer in your book. Otherwise your result looks OK.

ehild

3. Aug 11, 2010

### Sheen91

Re: Velocity

There are two answer rads/s and degs/s, both are not the same as my answer.

I definitely did something wrong.

4. Aug 11, 2010

### ehild

Re: Velocity

The sign can be wrong. The velocity shown makes the angle θ smaller.

ehild