Submarines float or sink by increasing or decreasing the air in their ballast tanks. These tanks have valves that allow them to fill with water, increasing the overall weight of the submarine and causing it to sink. The valves fill the ballast with compressed air to surface.Know More
The ballast tanks are located between the inner and outer hull of the submarine. Increasing or decreasing the air in these tanks affects the vessel's buoyancy. Increasing the air in the tank gives the submarine positive buoyancy and makes it less dense, so it rises to the surface. Increasing the water in the ballast tank makes it more dense, giving it a negative buoyancy and causes it to sink. In an emergency, the ballast tanks have the ability to fill rapidly with air, causing the vessel to surface quickly.
The submarine has two additional water tanks, one at the front and one at the rear. These trim tanks help to keep the vessel level during operation. As supplies and fuel are used, the operators change the amount of water in these tanks continually to maintain the trim. The planes of the submarine are horizontal rudders that help the vessel to change its level in the water while it is moving. Rudders control the movement of the unit to the left or right.Learn more about Motion & Mechanics
Ships float because they displace enough water for the buoyancy force to be greater than the force of gravity acting on the ship. The displaced water attempts to return to its original position, now occupied by the ship, which pushes the ship up. This effect is known as buoyancy force. The strength of the force of gravity pulling down on the ship is affected by its weight. Whichever of these forces is stronger determines if the ship floats or sinks.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 >
Any body in water floats or sinks depending on the buoyant forces that push it up and the gravity that pulls it down. If the body is heavier than the water it displaces, it sinks. If the water the body displaces is heavier, then the body floats.Full Answer >
Ice cubes float in water because ice has a lower density than water. This lower density means that ice weighs less than water in its liquid form.Full Answer >