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## Homework Statement

A 70cm diameter wheels accelerates uniformly from 160 rpm to 280 rpm in 4.00s.

Determine:

a) it's angular acceleration, and

b) the radial and tangential components of the linear acceleration of a point on the edge of the wheel 2.00s after it has started accelerating

a=?

w2= 280rpm

w1= 160rpm

t = 4.0s

d= .7m

## Homework Equations

a = w2-w1 / t

## The Attempt at a Solution

I used that equation for part a, with a= 280rpm - 160rpm /4.0s

and got a= 30 , but I don't feel that is right. Is there a better equation I could have used?