Asked by Dave

A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water at the door is 1.50 m?
Answered by Damon
It depends on the pressure inside the car. after a few minutes the car will fill with water from holes in the floor etc and only a bubble of air at ambient (water) pressure will remain under the roof (avoid leaky sun roof). At that point the door (or window) will open easily.
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