Yes, they does.
No.
They rise to the surface when air is pumped IN. They sink when air is let out
They use ballast tanks to contain sea water or air to control their depth
Submarines change their depth by use of ballast tanks. To dive, they open their tanks so that they become filled with water. They also angle their dive planes. To surface, they pump the water out of their tanks and fill them with pressurised air.
Submarines stay afloat by using a combination of buoyancy and ballast control. When they want to surface, they use compressed air to force water out of ballast tanks, making the submarine lighter and allowing it to float. To dive, submarines take in water into these tanks, increasing their weight and causing them to sink. By adjusting the amount of water in the ballast tanks, submarines can maintain their desired depth in the water.
Submarines are designed with enough ballast and control systems to allow them to submerge and surface as needed.Surface ships are designed only with enough ballast and control systems to keep them on the surface. While they can sink just as well as submarines can, their ability to re-surface without a salvage operation is non-existent.
Submarines can go downward because they flood their buoyancy tanks with water. This reduces the buoyancy of the sub, allowing it to go down. To rise again, the water is pumped out of these tanks.
a submarine has a water tank. when the tank is filled then submarine sink in the water. and when the tank is empty then submarine float in water. use the formula density= mass / volume as mass increases(when the tank is full of water), the density of the submarine increases and it submerge into the water and vice versa.
Buoyancy is useful for objects or substances that are floating or submerged in a fluid. It allows boats and submarines to float or stay afloat in water, and also helps hot air balloons and blimps to rise and stay airborne. Understanding buoyancy is important for designing structures that need to float or be submerged in fluids.
1. Ballistic submarines 2. Attack submarines
Boats, Subs, Submarines, Home.
Yes, North Korea has submarines