1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Pressure on wing of plane

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data
    An airplane has a mass of 1.60 x 10^4kg and each wing has an area of 40.0m^2.
    During level flight, the pressure on the lower wing surface is 7.00x10^4Pa. Determine
    the pressure on the upper wing surface?


    2. Relevant equations
    Newtons third law


    3. The attempt at a solution
    As I read through about airplane and wing I see that the force on the wing
    has an equal and opposite reaction force. Also the curvature of the wing is a factor.
    This problem states no curvature? The wings are assumed parellel to plane.
    Is this simply 7.00x10^4 for the top? from the information given or am I missing
    something
    Thanks,
    Kevin
     
  2. jcsd
  3. Dec 3, 2008 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    You are reading too much into the question.
    All it is asking is how much force is needed to lift the plane's mass.
    Given the wing area how much pressure difference is needed to supply this force.
     
  4. Dec 3, 2008 #3
    Thanks,
    hmmm. Don't know what to do with the mass
    F = PA so that is to be (7.00x10^4)(40.0m^2) x 2 = 5.6x10^6N
    I might need a clue from there.
    Thanks,
    Kevin
     
  5. Dec 3, 2008 #4

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Force down = weight = mg
    Force up = pressure difference * area

    It want's the total pressure so you need to subtract the pressure difference from the absolute pressure on the bottom
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?