Resultant force on aircraft door

AI Thread Summary
To calculate the resultant force on an aircraft door, the pressure difference between the cabin and the outside atmosphere must be considered. The cabin pressure is 100kPa while the outside pressure is 28kPa, creating a pressure difference of 72kPa. This pressure difference, when applied to the door's area of 2m², results in a force of 144,000N acting outward. Although the door remains stationary due to reaction forces from the hinges, the net force on the door is not zero; it is the balance of the internal and external forces that keeps it in place. Understanding these forces is crucial for analyzing aircraft door mechanics.
Andy21
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Homework Statement


The air pressure at the altitude an aircraft is flying at is 28kPa. If the pressure inside the cabin is maintained at 100kPa, what is the resultant force on a door of area 2m^2 in the side of the aircraft?

Homework Equations





The Attempt at a Solution



I am not sure whether the answer is 0N because the door must be stationary and therefore no resultant force must be acting on it or do you have to work out the pressures exerted on the door from outside and inside the aircraft and then subtract the smaller of the forces.
 
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Yes, your looking for the resultant force from the pressure difference over that area. The reason the door doesn't move is because there is reaction forces applied by the hinges..so the true net force on the door is zero.
 
thanks for the help
 

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