Angular acceleration of wheel

  • Thread starter balletgirl
  • Start date
  • #1
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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?
 

Answers and Replies

  • #2
284
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The formula you used is fine, but more accurately:
[tex]\alpha = \frac{{\Delta}\omega}{{\Delta}t}[/tex]
this gives average angular acceleration over the given time interval.

You need to specify units in your answer (and you'll find you want to convert it to more logical units)
 

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