Submarines are able to control their depth via ballast tanks that take on or release water to make the submarine more or less buoyant than the water around it, explains How Stuff Works. This causes the submarine to float or sink.Know More
While at the surface, a submarine floats the same way a ship does. The water they displace is equal to the weight of the ship, which creates a buoyant force that counteracts gravity. However, submarines are different from other ships, because other ships have a set buoyancy and submarines can change how buoyant they are.
Submarines have ballast tanks that can be filled with either water or air. While on the surface, the submarine's tanks are filled with air, just as a ship is. When the crew of a submarine wants to sink, they discharge the air in their tanks and fill the tanks with water. Filling the tanks with water creates a negative buoyancy, and this negative buoyancy causes the ship to sink. The submarine crew can control the angle at which they dive by adjusting the angle of the short wings on the top of the submarine, also called hydroplanes. In case of emergency, submarines carry a supply of compressed air that allows them to return to the surface, should the need arise.Learn more about Motion & Mechanics
To make a submarine from a water bottle, make holes on one side of the water bottle and tape heavy coins on either end. Attach a flexible straw at the mouth, and add plastic tubing to operate the submarine. Use clay to attach the straw to the bottle's mouth.Full Answer >
While some foreign equivalents of the penny can float on water, the American penny will not float on water. The American penny is over 97 percent zinc and just over 2 percent copper. Zinc has a density of 7.14 gram per centimeter cubed, compared to water, which has a density of about 1 gram per centimeter cubed.Full Answer >
As depth increases, pressure increases. For example, if a person is diving underwater, the pressure on the diver's body greatly increases the deeper she swims.Full Answer >
The Titanic sank to a depth of approximately 13,000 feet in the north Atlantic on April 15, 1912. The depth was not discovered until a joint French-U.S. expedition found the ship in 1985.Full Answer >