For a submarine, identify when it will have the least buoyant force acting on it

Question

For a submarine, identify when it will have the least buoyant force acting on it. Assume that neither the volume of the submarine nor the density if the water change. Choose all the values. When it is full of cargo and fully submerged at a depth of 10 m. When it is empty, fully submerged, and resting on the bottom at a depth of 20 m. When it is dry dock and no part of it is submerged in water. When it is full of cargo and floating on the surface. When it is full submerged, and resting on the bottom at a depth of 20 m. when it is empty and fully submerged at a depth of 10 m. When it is empty and floating on the surface.

Explanation / Answer

Buoyant force = volume of water displaced by submarine x denssity of water x g

where least volume of water is displaced where buoyant force will be minimum.

and when submarine floating then

buoyant force = weigt force of submarine.

so when submarine is floating, it will displace least water.

and when weight of submarine is less in floating that means buoyant force will be less .

in case it is out water then there is no buoyant force in it ( out of question)

Ans. when it is smpty and floating on water .

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