oh word, i did not even realize what i had posted.

Pretty sure density of ice is always .91 g/cm3. You're right that its about density though. If it was any other frozen solid besides ice the answer would be different.

Answer is the water level stays the same. It displaces its mass in the equivalent volume of water when its floating, and once it melts, the mass it was displacing is its own volume.

since the rock in the boat would put the boat into the water a bit deeper, the volume should stay the same after the rock was thrown out:
the boat will be lighter therefore rise out of the water further. but the rock will still does his part, which should be exactly the same?

it depends on how heavy is the rock.

think of it, for the rock with same volume (size),
a heavier rock would cause the boat to sink more,
a lighter rock would cause the boat to sink less.

however, since the volume of the rock is constant,
the rise in water level would remains constant.

therefore, for a super heavy rock, the water level would fall after it is thrown into the water.
use your brain before you vote



that is only true when the whole item is in water

This post was edited by hk_nobody on Nov 1 2009 05:42pm

In relation to VOLUME, not mass. Two objects with different masses but equal volume will displace the same amount of water when submerged. If the density of an object is lower than the density of water, it will displace the amount of water equal to its weight.
Archimedes found that the crown displaced more water than a piece of gold of the SAME mass, meaning that the crown was less dense than gold, because with equal mass it had more volume.

This thread was answered fairly quick. Not difficult enough of a question.

Well over half the people have gotten it wrong.