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HW Q's and need A's quick

  1. Nov 17, 2009 #1
    1. The problem statement, all variables and given/known data An 80KG(bike and rider) are going over the top of a hill shaped in a circle and arch is 60m. If moving at 35m/s at top of hill whats the size of the normal force on bike and rider.



    2. Relevant equations



    3. The attempt at a solution -849N?
     
  2. jcsd
  3. Nov 17, 2009 #2
    well, for one you're gonna have centripetal acceleration so when you apply the kinetic equation (using a normal-tangential coordinate system) you'll be able to get the answer pretty easily. I got N = 2418, which unlike your answer is positive indicating an upward reaction force (assuming you're coordinate system is positive upwards)
     
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