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

Question

For a submarine, identify when it will have the greatest buoyant force acting on it. Assume that neither the volume of the submarine nor the density of the water change. Choose all that apply.


When it is in dry dock and no part of it is submerged in water.
When it is empty and fully submerged at a depth of 18 m.
When it is full of cargo and floating on the surface.
When it is full of cargo and fully submerged at a depth of 18 m.
When it is empty, fully submerged, and resting on the bottom at a depth of 36 m.
When it is empty and floating on the surface.
When it is full of cargo,fully submerged,and resting on the bottom at a depth of 36 m.

Explanation / Answer

 

The buoyant force is equal to the weight of the fluid displaced, where fluid displaced is equal to the volume of the part of the object that is submerged in water.

From this definition, you can see that the buoyant force is independent of the mass, but dependent on how much of the submarine is submerged below water. Therefore, answers 2, 4, 5, and 7 are correct.

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