Why does the iron ball sink, whereas ship made of iron floats on water?
443459
Buoyancy is responsible for floating everything on the water surface. Buoyant force is proportional to the surface area of the object. For ship is is too much and for ball it is too less.
156880
if iron comes into contact with moisture and air, it starts to rust.The surface of iron is painted because it prevents iron from coming into contact with air and moisture.
372889
Every body that is in a fluid, or it is floating on the surface, or is sunk to the bottom loses an equal ammount of weight as the weight of the displaced fluid by the volume of the body.\n\nThe force that makes body's float or makes them lighter in a fluid (for ex. water) is called Archimed's force or Archimed's principle.\nIf this force is grater then the weight of the body (G=m*g) then the body floats on the surface.\n\nArchimed's force is greater if the density of the fluid is bigger. Oil has the density of 900 g/cm3 and water has the density of 1000 g/cm3. Because the reason why the objects are floating in oil and in water is of same nature, floating on oil is similar to floating on water.\nBut water has a bigger push force then oil.
722868
B) FALL. The reason is that while the stone is in the boat (or otherwise floating or being supported by a floating object), it is displacing water equal to its WEIGHT, but when fully immersed, it displaces water equal to its VOLUME. This is less water (since if a volume of water equal to the volume of the stone weighed as much or more than the stone, then the stone's density would be less than that of water, which it isn't), and therefore the total water level in the lake will go DOWN.\n\nTo the other answerers: shame on you for not thinking through the problem carefully enough.
521447
This is same question as "a small stone is dropped from sky". here instead of air there is water, but logic is same. Water resistance plays a major role. Before hitting the floor the pebble achieves the terminal velocity, then moves with constant speed towards the ocean floor. Weight of the stone does not play a role, but shape of the stone does for terminal velocity value. A spherical stone is less resistant that any other shape. [I am assuming it rotates randomly while travelling down, so not considering submarine shape:)].\n\nHow long is still an unanswered question, due to missing data.
1091717
if the objects not close to any celestial body, it just 'floats'. like a bottle in the ocean.
433856
Perhaps you can picture it this way.  Take your 2,000 ton ship and melt it down and use it to make a very large solid steel cube.  Mearsure the cube and obtain an equal cube of water (say frozen into ice?).  Place the two cubes on opposite ends of a giant seasaw.  The steel cube weighs more than an equal volume of water and goes down (sinks!).\n\nTake a second identical steel cube and build a typical ship.  While still in drydock, fill the inside of the ship with water up to the intended water line (based on an identical ship?).  Drain the water out and use it to make another really giant ice cube.  This ice cube will now be much larger than the cube of steel.  Now place the steel cube and the ice cube on the seasaw.  The weight of the water goes down and the steel cube goes up (floats).  The weight (volume) of the water inside the drydocked ship is equal to the weight of water displaced by the ship (shoved aside by the floating ship) and acts upwards on the bottom of the ship with the same force it had on the seasaw.  It is more than enough to make the ship float unless the ship is loaded up until water flows over the side of the ship and floods it.  Hope that helps a little.
702149
salt water is heavier than fresh water. If the water is salty enough, the egg will float. Otherwise, it will sink.
80665
well as they said, the ball falls faster  than the feather, not becuase its heavier, not that gravity is more on it. its because of the simple reason, air risistence. in vacum, where there is no air , itll take the same time for both to reach ground.
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.
620475
from what ive heard titanic sink because the maker of it boasted that due to its magnificients make, even God cant sink it. Thou shall not test God.\n\n\nWhen the Titanic struck the iceberg, six of its 16 watertight compartments were damaged. The ship started taking on water in the bow through openings about 20 feet below the water line. \nAs the liner nosed down, water flooded compartments one after another and the ship's stern began rising out of the water. \n As the stern rose ever higher, the stress amidships was more than the vessel could bear. It broke apart just forward of the third funnel. The bow began to sink. \nWith the bow gone, the stern temporarily settled back to nearly level. The stern then rapidly flooded and rose out of the water, pivoting on the surface. It held that vertical position about a minute and then slowly slipped beneath the surface. \nThe bow section sank gently and plowed into the mud. The stern's impact was more traumatic: when it hit bottom, it buried itself some 50 feet, crumpling the steel hull.
149451
Objects float because the density of the object is less than the density of the liquid. If you increase the density of water by dissolving something, such as sugar or salt, in it and create a situation where the density of the water exceeds the density of the egg, the egg will float.
487982
I'd say physics rather than chemistry.  When you squeeze a bottle full of water containing a gas-filled "diver", the water is not compressed.  Only the gas in the diver compresses causing the diver to displace less water.  The cartesian diver is carefully made to be just barely buoyant, so when compressed its reduced displacement causes it to sink.
863380
On structures made of steel which are in constant contact with sea water (ships, oil rigs and piers) the most effective protection used is from 'sacrificial protection'. Blocks of magnesium are bolted to the structure at regular intervals and the sea water attacks the magnesium in preference to the steel. (This is because magnesium is much more reactive than iron) It is a quick method and cost effective if you imagine the labour (an amount of paint) needed to protect a large ship.
255989
A stationary body submerged in a liquid is effected by two forces, gravity and buoyancy. Gravity acts at the center of mass and it is always directed straight down. On a rigid body, the center of gravity can be considered stationary in reference to the body. Buoyancy, on the other hand, acts at the center of buoyancy, and the center of buoyancy moves as the body tilts and rolls. The size of the gravity force is;\n\nFg = Mass * Gravity\nThe size of the buoyancy force is proportional to the volume of liquid that it displaces, the force of gravity and the density of the liquid.\n\nFb = (Volume * LiquidDensity) * gravity\nWhen an object is stable in the liquid, the gravity force and the buoyancy force cancel each other out. This means that the boat is displacing an amount of liquid that weight as much as the boat does itself.\n\nFg = Fb
640568
The density of mercury is greater than the steel ball. Obviously the density of alcohol is less than both the ball and the mercury.
656289
ice floats in water because its 10% less dense than water, \n\nbut not all ice has to be ontop of water, so no not all the world's ice floating