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Homework Help: Help finding the radius

  1. Oct 4, 2004 #1
    A jet pilot takes his aircraft in a vertical loop

    (a) If the jet is moving at a speed of 1400 km/h at the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0 g's.

    I am having some trouble here. I converted the speed to be 389 m/s. I thought i would use the equation F=m(v^2/r) Then F would equal the normal force minus mg. But this does not seem to work out since we do not know the mass. I am a little confused. So any help would be great. Thanks
  2. jcsd
  3. Oct 4, 2004 #2
    F = ma.. Fcent = m*Acent
  4. Oct 4, 2004 #3
    i dont understand what you are saying
  5. Oct 4, 2004 #4
    I'm saying the question is asking for centripetal acceleration which is given by v^2/r. You don't need to sum the forces just the accelerations.
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