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 of the water change. Choose all that apply.


1.When it is full of cargo and fully submerged at a depth of 36 m.
2.When it is empty and floating on the surface.
3.When it is full of cargo and floating on the surface.
4.When it is empty, fully submerged, and resting on the bottom at a depth of 72 m.

5.When it is empty and fully submerged at a depth of 36 m.
6.When it is in dry dock and no part of it is submerged in water.
7.When it is full of cargo, fully submerged, and resting on the bottom at a depth of 72 m.

Explanation / Answer

buoyant force = density of fluid * volume of displaced fluid by object * g

so here density and g is constant.
so buoyant force depend only on Volume of displaced fluid

volume of displaced fluid is minimum when it floats on surface.
so options 2 and 3

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