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Homework Help: Drag on an air plane

  1. May 8, 2012 #1
    What wing area should a plane weighing 2000lbs have to enable it to land at a speed of 35mph?
    Max CL= 1.50

    Formula for lift

    lb= CL*ρ*A*v^2/2

    when i set up the problem i get this

    2000= 1.50*ρ*A*(35)^2/2 and i realize im trying to solve for A (area) but what does the ρ stand for? I read its stands for the density of the fluid
  2. jcsd
  3. May 8, 2012 #2
    The rho is density of air at the landing strip. Watch your units!
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