Posted by jessica on Sunday, December 19, 2010 at 10:34pm.
A jet (m = 4.00 105 kg), flying at 139 m/s, banks to make a horizontal circular turn. The radius of the turn is 3810 m. Calculate the necessary lifting force.

physics  drwls, Monday, December 20, 2010 at 1:15am
Regardless of the radius and velocity, the vertical component of the lift force must balance the weight, M g.
L cos A = M g
where L is the lift force. It is perpendicular to the wing, not straight up.
To get the vertical component, you must know the "banking angle", A. You can get this from
L sin A = M V^2/R (Tilting of the plane creates a horizontal lift component to provide the centripetal force)
To get L alone, square both equations and add
L = M*sqrt[g^2 + V^4/R^2]
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