11. Why an iron needle sinks in water, but an iron
ship floats in water?
Answers
The iron ship is constructed in such a way that it is mostly hollow from within Hence the average density of the ship is less than that of water (i.e. less than 1 g/cm3 ) whereas iron needle being compact and its density is 7.6 g/cm3 which is more than 1 g/cm3 (density of water) Hence the needle sinks in water.
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Answer:
The density of iron is more than the density of water, so the weight of iron is more than weight of water displaced by it and nail sinks.
While the shape of an iron ship is made in such a way that it displaces more weight of water than its own weight.
Secondly, the ship is hollow and the empty space contains air which makes the average density of the ship less than that of water and hence it floats on water.
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