Explain why an iron needle sinks in water but a ship of iron floats on water?
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Answer:
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/cm
3
) wheres iron needle being compact and its density is 7.6g/cm
3
which is more than 1 g/cm
3
(density of water) Hence the needle sinks in water.
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1
Explanation:
As the density of an iron nail is more than that of water, the nail sinks in water. The volume of water displaced is much greater than the volume of the iron ship. Hence, according to Archimedes' principle, the upthrust is more than the weight of the ship. That is why the iron ship floats in water.
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