Posted by **mani** on Tuesday, October 12, 2010 at 8:07pm.

an aeroplane is flying in a horizontal circle with airspeed of 480 km/h. The wings of the plane are tilted at 40 degrees to the horizontal. What is the radius of the circle and how long does it take the plane to complete one full circle?

- physics-newton's laws -
**bobpursley**, Tuesday, October 12, 2010 at 8:12pm
change km/hr to m/s

Look at a vector diagram. mg is down, lift is perpendicular to the tilt angle.

You need to realize the vertical part of lift is equal to mg (so mg=Lift*sin40

That give you lift. Now, the portion of Lift keeping the plane accelerating inward is lift*cos40.

So set lift*cos40=mv^2/r, and mass divides out, so you can calulate r.

period is the final easy part:

time=2PIr/velocity

- physics-newton's laws -
**mani**, Wednesday, October 13, 2010 at 12:05am
thank you so much :)

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