1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Angular velocity

  1. Mar 12, 2006 #1
    A merry-go-round is accelerated from rest by a child at a steady acceleration of 0.2 rad.s-2.

    1)How long does it take for the merry go round to reach an angular velocity of 1.4 rad.s-1?
    2)How many revolutions does the merry go round (and the child) make in this time?

    I belive I worked out the first one, where a=w/t. so t=w/a (t=1.4/0.2). Am I correct?.

    However I can't understand the second part..is there an equation to find the number of revs?
  2. jcsd
  3. Mar 12, 2006 #2
    The first question, I think you're right.
    For the second one, find the angle [itex]\theta=\frac{1}{2}at^2[/itex]
    The revolutions are [itex]N=\frac{\theta}{2\pi}[/itex]
  4. Mar 12, 2006 #3
    is it ok to use w=[itex]\theta/t to find the angle?
  5. Mar 12, 2006 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    No because this will only give you an average angular frequencey. As there is acceleration you need to use the equations phuncv87 posted.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Angular velocity
  1. Angular velocity (Replies: 2)

  2. Angular Velocity (Replies: 9)