Question

What happens to the buoyant force of a submerged submarine when water is taken into its tanks and it dives?

It remains unchanged.

It increases.

It balances the weight.

It decreases.

Answer 1

A submarine has flotation tanks that are filled with air and sea water. There is just enough water in the flotation tanks to allow the submarine to maintain a consistent depth in the ocean. This means that the overall weight of the submarine—the weight of the vessel plus the additional weight of the water in its tanks—is equal to the buoyant force pushing upward on the submarine.

To dive deeper into the ocean, the submarine increases its weight by drawing more sea water into its flotation tanks, replacing the lighter air with the heavier water. The submarine dives when its overall weight is greater than the buoyant force.

So I’d say D. It decreases

Step-by-step explanation:

Answer 2

A submarine or a ship can float because the weight of water that it displaces is equal to the weight of the ship. ... To control its buoyancy, the submarine has ballast tanks and auxiliary, or trim tanks, that can be alternately filled with water or air (see animation below).

Answers:

It would seem that it would be B..... you'd have to decrease the buoyant force by removing the air from the dive tanks and filling them with water. And in a way it's C - by allowing water into the dive tanks, you are balancing the weight of the sub with the water around it.