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Uniform circular motion

  1. Sep 28, 2007 #1
    1. The problem statement, all variables and given/known data

    You maintain a speed of 400mph at an altitude of 20,000ft what is the diameter around the airport with a wing span of 250ft.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Sep 28, 2007 #2


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    Staff: Mentor

    Please write the relevant equations.

    There seems to be some information missing, particularly the constraints.
  4. Sep 28, 2007 #3
    Your are traveling in a circle and the upward lift force is equal to the downward weight force.

    [tex]\Sigma[/tex]F=Ncos([tex]\theta[/tex])=V^2/r in the x direction
    [tex]\Sigma[/tex]F=Nsin([tex]\theta[/tex])-mg=0 in the y direction

    I used these two equations to solve for r which is my radius and doubled that for my diameter however my answere is not correct. I must be missing something but I am not sure how the altitude plays a role in the problem or wing span.
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