Why do some iron objects such as ship float when placed in water while other iron objects such as nails sink?

1. They are composed of different types of iron


2. The same reason that makes planes fly in the sky


3. Iron ships have large air pockets inside them, making them less dense than water and thus able to floatWhy do some iron objects such as ship float when placed in water while other iron objects such as nails sink?
Because they displace a greater amount of water than they weigh.





So basically the answer is #3, due to their shapeWhy do some iron objects such as ship float when placed in water while other iron objects such as nails sink?
c
2
ummm... did you just ask and answer your own question???





yes you did!!!
4. a ships design lets the iron displace more weight of water than the weight of the iron. you could take a nail and reshape the metal in it until you reached the point of boyancy, then again if you rehaped the amount of iron in a ship by making it narrower it would sink.
i would think c but i am probably wrong.
Anything that weighs less than the water it displaces will float
http://en.wikipedia.org/wiki/Buoyancy
Because according 2 Archimedes' principle a substance when partially or fully immersed in a liquid it displaces the same amount of water which exerts an upthrust to the substance.In case of a nail volume is less so,upthrust is also less but volume of ship is more so,upthrust is also more.and according to printciple of floation abody will float if its upthrust is more than its weight.


thus on case of ship upthrust is more than weight but in case of nail upthrust is less than its weight.
I hate it when people try to be stupid. I'm sure you do it well with out trying.





A) There is no replacement for displacement