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**1. Homework Statement**

An airplane is flying at an elevation of 12500 m. The window on an airplane is a square of length 0.115 m on each side. What is the net force on the window?

**2. Homework Equations**

P = Po + pgh

p = 1.26 kg/m^3

Pair = 101.3 kPa

**3. The Attempt at a Solution**

I thought about using the elevation in the first equation, but I remembered that it applied to the displaced air so I used the height of the window. I had the force from the air pressure on the top of the window and the force from the air pressure on the bottom of the window.

P = 101300 Pa + (1.26 kg/m^3)(9.8 m/s^2)(-0.115 m)

F = P * A

F = 101299 Pa * (0.115 m)^2

F = 1340 N downwards