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Homework Help: Circular Motion Plane Loop

  1. Apr 2, 2008 #1
    1. The problem statement, all variables and given/known data
    someone is flying a plane and he is being chased and at the bottom of the loop his guages say he is traveling at 180km/h he is sitting on a bathroom scale which says he weighs 4 times what he normally does, what is the radius of the loop in meters?

    2. Relevant equations
    Fc=Fn ?

    3. The attempt at a solution
    well 180km/h is 50m/s and since he is 4 times as heavy the acceleration due to gravity will be 4 times greater? so i used the formula and it comes out as 63.71 m which seems unbelievable so i figured id ask, probably somthing stupid im doing wrong

  2. jcsd
  3. Apr 2, 2008 #2


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  4. Apr 2, 2008 #3
    thanks i think its right :)
  5. Apr 2, 2008 #4
    Aren't the forces on the body at the bottom of the loop [itex]\vec{F_{cf}}+\vec{W}=4\vec{W}[/itex]? Then we get different acceleration.
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