| Author: Bharat | Member Level: Bronze | Revenue Score:  |
This explanation is not proper and misguiding. Big ships sail on water. They also observe gravitational force but never sink in water.
Nail sinks in water because It's volume is lesser then its mass or we can say that its specific gravity is higher then water due to its small volume. Ships has higher volume due to its shape which is mostly filled by air space and so its specific gravity become very very low than water and sail on water. If we fill all space with heavy material like Iron, then It will sink in water.
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| Author: arjun | Member Level: Bronze | Revenue Score: |
Archimedes' principle states that
Weight of liquid displaced = Buoyant force
The weight of the water displaced by the ship is equal to its weight, so it floats. Whereas the weight of the water displaced by the iron nail is less than its weight so the iron nail sinks.
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| Author: arjun | Member Level: Bronze | Revenue Score: |
According to Archimedes principle and we can note that the amount of water displaced by a needle is lesser than the amount of water moved out by the needle (that is displacement of the needle). So the needle is no longer stay on the surface of the water and sink into the water. As it sink into the water means below the water it can not be float again because of it density (mass per volume) is heavier than the density of the water.
But in the case of iron ship, if the shape of the iron is just a flat and it can be sink like a needle. But making the Iron by forming a shape causing her displacement (it displaces on the water) more than weight of water she move out (immersed in) the ship can stay on the water.
Yes, as we say if the displaces by ship is equal to the water that she move out is equal then the ship is afloat (at the certain draft).
For the ship which design to afloat on the water until extra particular amount of cargo is loaded on the ship (dead weight ton). She can remain afloat until that amount of weight is reached (that is displaces by ship is equal or more than the displaced water. but if she has lesser amount she subject to sink.)
These are the basic and other factors to be taken into account as per their structural design by NA.
That is my idea but please overwrite mine if your answer is good enough.
Toe Wai Win (Singapore Maritime Academy) COC 1&2
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