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the horizontal door of a submarine at the depth of 500m has an area of...

the horizontal door of a submarine at the depth of 500m has an area of 0.4^2 calculate the force exerted by the sea water on the door at this depth. (relative density if sea water=1.03)(atmospheric pressure =1.0×10^5Nm^_2) (density of pure water =1000kgm^_3 )(g=10m/m^2)?
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