Question

A submarine has tanks built into it, to enable it to dive beneath the surface or float on the surface of the water.
Which of the following correctly explains how this happens?

1 When the tanks are empty, the density of the submarine increases and it floats on the surface.
2 When water fills the tanks, the density of the submarine increases and it sinks beneath the surface.
3 When the tanks are empty, the density of the submarine decreases and it sinks beneath the surface.
4 When water fills the tanks, the density of the submarine decreases and it floats on the surface.

Answer 1

Answer:

2 explains it correctly

Answer 2

Answer;

SINKING:

the submarine is provided with water tanks. When the submarine is to dive, water is filled in water tanks and it is made heavier and the average density of submarine becomes greater than the density of seawater and it sinks.

FLOATING:

To make the submarine rise to the surface of water,THE water tanks are emptied an average density.

ANSWER:

so the answer is the number 2