What keeps a 16000 tons vessels floating on water?
443139
BOUYANCY & SURFACE TENSION
885671
DENSITY is the key.\n\nRemember, an aircraft carrier will float in water because it is less dense than the water.  To calculate density, divide mass - kilograms (m) by volume - cubic meters (v).\n\nPure water at 25 degrees Centigrade has a density of 998 kg/m^3 so any object with a density lower than this would float.  Higher would sink.\n\nInteresting note:  If you could find a body of water large enough, the planet Saturn would actually float in it since it is less dense.
132092
Sure. They can raise a sunken boat by putting inflatables inside the hull and blow in air. That's just like a big balloon.
226032
There is theory that says perhaps the fresh water aquifers under that area of the ocean rupture into the salt water, making the water less boyant.  That would sink ships loaded with cargo or near their max weight limit.  Yet it does not account for lost planes.  So who knows?
104843
That's an interesting question.  Large ships use a navy anchor with pivoting flukes that can sink into the seabed and hold on.  The bow of the ship is specially designed to house the heavy anchor when hoisted.  An anchor windlass lowers the anchor using heavy chain from the chain locker.  The end of the chain is attached (bitted) to the chain locker.  If the windlass fails (poor brakes?) the last link over the side is the bitted end, giving rise to the old saying "the bitter end" which can whip around killing anyone nearby!  After lowering the anchor to the bottom, additional chain must be played out so that the pull on the anchor will be at a gradual angle and the ship will rotate around the anchor in a wide circle, for example if the tide or winds shift.  Therefore, far more chain is needed than the actual depth.  When the anchor is taken in, the ship pulls nearly directly over the anchor and wave action plus the powerful windlass pull it free.\n\nA second popular anchor for use at moorings is the mushroom anchor that is round and curved like cutting a hole out of a large sphere.  The mushroom anchor therefore looks like the top of many common mushrooms.  This anchor settles under the muck and silt on the harbor bottom and forms a vacuum under the anchor when pulled on.  A rubber suction cup works because the atmosphere is pressing on the cup at about 14.7 PSI reguiring a 14.7 pound fource to break the suction of a one square inch cup.  A mushroom anchor resists being pulled up with a force of 14.7 pounds per square inch of area because of the atmospheric pressure plus the weight of the water above the anchor.  The water exerts a force of one atmosphere for every depth of about 34 feet.  Therefore a mushroom anchor at a depth of 34 feet is like a suction cup at two atmospheres or 29.4 pounds per square inch times the area of the anchor.  Often to pull up a mushroom anchoor from the sea, a barge (or large boat) is placed over the anchor and all slack is taken up at low tide.  As the tide comes in it will raise the boat and anchor unless the boat is too small in which case the boat will be dragged under unless cut free!  The anchor may contain hole in its disk to help break suction and to aid in cleaning it with a hose.
792914
Yep.  If you put a 1000 ton boat in the ocean, the level rises just as if you put 1000 tons of salt water in the ocean.  Don't try to measure it though.
563919
Assuming that the cardboard is water tight:\n\nBuoyancy force = Weight of water displaced\n\n(mass of boat)*g = (desity of water) * 4ft*5ft * height * g\n\n81820g = 1g/cm^3 * 18581 cm^2 * height\n\nheight = 4.4 cm, which is the waterline when the boat weighs 180 pounds.\n\nYeah, it sounds quite unbelievable, but most boats that large with a height of 1 foot can hold over 1100 pounds of weight before completely sinking.
282829
This is similar to asking why gravity doesn't affect boats. It does, but buoyancy keeps them above water. Similarly, if you push a hollow rubber ball down to the bottom of a pail of water and simply release it, it will pop back up to the surface.\nThe helium balloon is just being pushed up by the relatively higher air pressure under it. See the sources for a detailed calculation and a diagram of the pressure situation.
257654
Say the anchor weighs 15 pounds in air and displaces 2 pounds of water.\nBefore the drop, the boat displaces its weight plus the 15 lb weight in air of the anchor. This is the maximum displacement situation, so the water is at maximum height.\nAfter the drop, if the anchor hits bottom, the boat displaces its weight only and the anchor displaces 2 lb of water, the minimum displacement situation, so the water is at minimum height.\nAfter the drop, if the anchor doesn't reach the bottom, the boat displaces its weight plus the 13 lb weight in water of the anchor. The anchor displaces 2 lb water. The total displacement is the same as the maximum displacement situation, so the water is at maximum height.
218971
Any object will float as long as it displaces a volume of liquid that is more massive than itself. Take the aluminum boat and fold it into a block of aluminum and it sinks. But due to the shape of the boat, the mass of the aluminum,plus you, and your fishing gear, is still less than the volume of water pushed aside by the hull of the boat. So, you float.
905607
make a little "boat" that you can add weights to and float it in the different liquids.  Gradually add weight to the boat in each liquid to see how much it can hold before it sinks.  The more weight the boat can hold, the greater the density of the liquid!\n\nThis is basically a poor-man's hydrometer.
65763
Because a ship has surface area, a needle doesn't. Water can flow around it, so it sinks.
743392
it always floats.  take a look at any type of oil spill, the authorities that take care of it float a ring around the spill to stop it from spreading. these rings are called Booms. they are barriers that float on top of the water or are dragged beside or behind vessels and are the most common type of equipment used to control the spreading.  These mechanisms float on the surface and have three main parts:  a 'freeboard' or part that rises above the water surface and contains the oil and prevents if from spilling over, a 'skirt' that rides below the surface and prevents the oil from escaping under the boom, and a chain or cable that connects, strengthens, and stabilizes the boom.  Connected sections of the boom are placed around the oil spill until the pollutant is completely surrounded and eventually contained.
985921
It looks kind of like a boat. See the source.
387596
size and weight of boat would be important to know.
594942
It is said that the SHIP sinks in the water in that area.\nThat's may be due to higher gravity or some other force which is still unknown.
901376
Buoyancy is alot like drag in air, its proportional to surface area. (As in, if you increase the surface area, the force required to overcome the "drag" of water increases).\n\n You have one of two situations: Your boat is stationary, in which case, a barge or square shaped vessel with pontoons balancing it, or a dynamic vessel, with pointed fore and aft sections, once more with pontoons.\n\n Pontoons are what are going to make or break your design, you can increase your potential surface area by adding pontoons on arms, jutting from the sides of your vessel, and reduce your boat's mass at the same time.