# Uniform circular motion

1. Sep 28, 2007

### splac6996

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. Sep 28, 2007

### Staff: Mentor

There seems to be some information missing, particularly the constraints.

3. Sep 28, 2007

### splac6996

Your are traveling in a circle and the upward lift force is equal to the downward weight force.

$$\Sigma$$F=Ncos($$\theta$$)=V^2/r in the x direction
$$\Sigma$$F=Nsin($$\theta$$)-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.