# Constant angular acceleration of a rotating wheel

1. Apr 19, 2010

### jscherf92

A rotating wheel requires 4.7 s to rotate
through 33.5 rev. Its angular speed at the
end of the 4.7 s interval is 45.5 rad/s.
What is its constant angular acceleration?
Assume the angular acceleration has the same
sign as the angular velocity.

wf^2-wo^2=2a(Of-Oo)

Ive got a page of failed equations on my paper, and i need a push in the right direction.

2. Apr 20, 2010

### tiny-tim

Hi jscherf92!

The question doesn't give you the initial angular velocity, so I don't think we can assume it's zero.

So use a standard constant acceleration formula with s t a and v (angular version)