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An object will float on water if it has less density than the water.
An object will float on water if it has less density than the water.
boyancy in the hull of the ship
The amount of water displaced by its base body is heavier than the weight of the ship.
The boat.
The amount of water displaced by its base body is heavier than the weight of the ship.
Buoyancy is based on average density, not the weight of the ship's hull. As it lowers into the water, the water displaced is lighter than the hull, but much heavier than the airinside the ship's hull. As long as the combined weight of the ship and its cargo is less than the water displaced by the hull, it will float. If, however, water fills the ship instead of air, the ship (as we all know) will sink.
Salt makes the water denser or heavier if you like. the result is that anything including ships will float more easily.
I am pretty sure cruise ships are built in dry docks where they can be flooded to float the ships. This is something i saw on Discovery channel on tv. Once the ship is complete they can flood the dock to float the ship to the ocean.
It is not more dense than water. Density is mass/volume; although made of materials heavier than water its enclosed volume is so high that its density is lower than water.
The ship will float lower. Even though the foam balls are lighter than water they are still heavier than the air they replace in the ship's hold making the ship heavier than an empty one.
A steel marble will sink because it's solid steel and heavier than water all the way through. A steel ship is hollow and the inside is full of air. Just the shell is heavier than water but, on the whole with the air inside, the ship is lighter than the water so it floats. Experiment: Take an old, empty can (with no lid on it) from the kitchen and submerge it water. It will stay submerged. The can itself is heavier than water. Now fish the can out and empty the water out of it, and put a small weight (maybe a small piece of stone or something) to hold the can upright in the water. The can will now float!