- #1

monnapomona

- 39

- 0

## Homework Statement

The modern Boeing 747 passenger jet airplane cruises at a speed up to 920 km/hr, at an altitude of 11,500 m. The cabin pressure is maintained equivalent to the atmospheric pressure at an altitude of 2,000 m. This is called the "cabin altitude".

I couldn't find information on the area of the passenger windows in the 747, so let's assume they're about 0.085 m2.

If the airplane were stationary at its cruising altitude, what would be the force on the window?

Air density = 1.29 kg/m^3

## Homework Equations

ΔF = ΔP*A

## The Attempt at a Solution

Needed to find the pressure difference so I tried using this formula to find pressures at the given altitudes:

P2 = P1 + ρgh

But it gave me an unrealistic value at height 11000 m (since pressure decreases with increasing height). I'm not really sure which formula to use to find the pressure at the given altitudes. :s