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posted by  baznguy on 7/29/2008 3:30:25 PM  |  status: Live  

please help!!1 I can't find a way to work this

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Question Details:
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 51200 N. The lift force vector L 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?
wrong check mark N

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

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posted by Steve (retired) on 7/29/2008 3:36:15 PM  |  status: Live
Asker's Rating: Helpful   
baznguy's comment:
"thanks"
Response Details:
vertical forces are balanced so
 
   L cosθ = mg    or
 
   L = mg / cosθ  =  51200 / cos21  =   54842.6237 newtons
 
   and the horiz forces are balanced so
 
    R  = L sinθ  =  54842.6237 sin21  =   19653.8386 Newtons
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