A submarine sinks as it fills its' ballast tanks with water. Then it uses pressurized air to empty them and float again.
a ship floats on the water and a submarine can go underwater and on top of the water
Yes, when a submarine boat pumps water out of its flotation (not floatation) tanks, the submarine should rise.
because of density
This displacement of water creates an upward force called the buoyant force and acts opposite to gravity, which would pull the ship down. Unlike a ship, a submarine can control its buoyancy, thus allowing it to sink and surface at will.
Take some toast weigh it down and stab something through it that floats. Itwill get soggy underwater and release the floating object
The first successful submarine was built in 1620 by Cornelius Jacobszoon Drebbel, a Dutchman in the service of James I of England - it may have been based on Bourne's design. It was propelled by oars and is thought to have incorporated floats with tubes to allow air down to the rowers.
The submarine will float when its weight is equal to the upthrust acting on it. This is because the upthrust force pushing the submarine upwards is equal to the weight of the water displaced by the submarine, resulting in a state of equilibrium where the submarine neither sinks nor floats.
A submarine can submerge by filling ballast and trimmer tanks with sea water. The additional weight will take the submarine down. To resurface, the submarine will blow the sea water out of the tanks using compressed air. The air in the tanks make the submarine buoyant, so it rises and floats on the surface. Though a stationary submarine can submerge in this way, it usually submerges going forward and using diving plane (fins) to steepen the dive, so getting under the surface faster.
They are actually called "planes" on a submarine and allow it to maneuver underwater. Horizontal "planes" allow the submarine to go up/down, vertical "planes" allow the submarine to go left/right.
Just type in down ,up,up,up,r2,L2, L2
That is a ballast tank used to alter the angle of the submarine up or down