Darren New nous apporta ses lumieres en ce 2008/01/01 19:13:
> You are sitting in a canoe, in a swimming pool, holding a cannon ball in 
> your lap. You throw the cannonball overboard, and it sinks to the 
> bottom. Does the level of water in the pool go up, go down, or stay the 
> same?
> 
> (I've asked this of probably a dozen or more scuba dive instructors, and 
> only one has gotten it right. The reasoning behind the correct answer is 
> obvious once you hear it. I don't remember if I got it right when I 
> heard it.)
> 
The level will go down.
When in your hand, you displace a volume of water that have the mass of the 
cannonball. When you drop it, the displace a volume of water egual to it's own 
volume. The cannonball have a higher density than the water as it sink.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you wonder if ground fog or 
athmosphere will look better for your company's market share pie chart.
Christoph Rieder

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