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Rotational motion?

  1. Nov 25, 2007 #1
    rotational motion??

    1. The problem statement, all variables and given/known data
    A rider rides a motorcycle over a spherical hill with a radius of 12 meters. Show that the max speed cannot exceed 24mph or 10.8 m/s is he is to remain on the surface of the hill


    2. Relevant equations



    3. The attempt at a solution
    I am not sure which equation to use!
     
  2. jcsd
  3. Nov 25, 2007 #2

    rl.bhat

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    What are the forces acting on him when he is on the top of the hill?
     
  4. Nov 25, 2007 #3

    rock.freak667

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    What force keeps him touching the hill?
     
  5. Nov 26, 2007 #4
    the force keeping him on the hill is gravity so would I use g=1/2 dt2?
     
  6. Nov 26, 2007 #5

    rl.bhat

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    If he is to remain on the surface of the hill, his weight must be equal to the centrifugal force acting on him due to his circular motion. Therefore mg = mv^2/r. Find the value of v.
     
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