Homework Help: physics

Posted by Anonymous on Thursday, October 25, 2012 at 2:49pm.

The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 55600 N. The lift force generated by the rotating blade makes an angle of 21.0° with respect to the vertical.

(a) What is the magnitude of the lift force?
N

(b) Determine the magnitude of the air resistance that opposes the motion.

physics - Jennifer, Thursday, October 25, 2012 at 3:45pm
The lift force L has an x and y component Lx and Ly:

Lx = Lsin21
Ly = Lcos21

In the y direction,

Lcos21 - 55600 = 0

Solve for L

In the x direction

Lsin21 - Fair = 0

where F air is the force of air resistance

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