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Rotational Motion About a Fixed Axis , NEED HELp :\

  1. Mar 21, 2008 #1
    1. The problem statement, all variables and given/known data

    A wheel of diameter of .68m roll without slipping. A point at the top of the wheel moves witha tangential speed of 5.4m/s. Whaat speed is the axle of the wheel moving? What is the angular speed of the wheel?

    How would i approach to do this problem, what equations would i need to use ?
     
  2. jcsd
  3. Mar 21, 2008 #2
    ok for speed of axle i took .5 * 5.4 to get 2.7m/s

    and for angular speed of wheel i took 5.4mn/s * .34m to get 15.9 rad/s

    am i correct ?
     
  4. Mar 21, 2008 #3

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi keylostman!

    Are you the same person as th3plan?

    Why have you posted the same problem twice?

    Your speed is right, but your angular speed is not.

    Angular speed = speed/radius, where speed means speed relative to the centre.

    You can either take the centre to be the axle - so the radius is .34, but you have to subtract the axle speed - or you can take the centre to be the (stationary) point of contact - so the radius is .68.
     
  5. Mar 21, 2008 #4
    so i take 5.4-2.7 ti get 2.7 m/s and multiply by .34m the radius to get .918 rad/s ?
     
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