The density of a submarine cruising beneath the ocean surface has the same density as
A)a crab.
B)iron.
C)a floating submarine.
D)ocean water.
E)none of the above

Question

Quizplus · Accepted Answer

For the submarine to remain submerged, it must displace an amount of water equal to its own weight. Since it is not floating to the surface nor sinking to the bottom, this means that the density of the submarine is equal to the density of the water it is displacing which is ocean water. Therefore, the correct answer is D.

The Density of a Submarine Cruising Beneath the Ocean Surface