Airplane Wings & Atmospheric Pressure

[LoveKnowledge]

1. I got the correct answer but I am confused about the reasoning and want to understand the concept..

"Rank from most to least, the amount of lift on the following airplane wings: a. Area 1000 m^2 with atmospheric pressure difference of 2.0 N/m^2, b. Area 800 m^2 with atmospheric pressure difference of 2.4 N/m^2, c. Area 600 m^2 with atmospheric pressure difference of 3.8 N/m^2



2. N/A



3. C, A, B

 

[LoveKnowledge]

I have a similar one that is related to this question (and I already have the answer) but I am confused to the concept of it and want to understand it..

"Consider an airplane with a total wing surface of 100^2 m. At a certain speed the difference in air pressure below and above the wings is 4% of atmospheric pressure. Show that the lift on the airplane is 400,000 N."

A: Pressure = F/A, F=PA=(0.04)(〖10〗^5 N/(m^2)) (100 m^2) = 4 x 10^5 N = 400,000 N for lift of airplane

Confused in understanding the reason of this...(math and equations are not my strong suit)