Here's a puzzle for you.

[Scotty]

oh and water at 30F is definitely denser as ice is frozen water

Were that the case, it would have been the iceberg that sank, not the Titanic. Ice floats in water because it has a lower density than water... It is more solid, but has a lower density

[Jon_W]

[quote author=Jon_W link=1320603421/6#6 date=1320653664]Here is a headache inducing one:

If you drop two identicle dimension spheres, with the same surface finish and dropped from the same height. One shhere is of a heavy material (say iron) the other of a light material (say wood).

Experement has shown that the wooden one will hit the ground first.

Why??

I'm struggling.

The full force formula applied to all 3 pairs of bodies gives a net acceleration of the Earth (in 1/r^2) biased towards the heavy ball. The force between the balls give a component to each of them in the direction of Earth (in 1/r^4), biased to the light ball.

Without more detailed analysis (and detail on the setup) seems to me the 1/r^2 would trump the 1/r^4 and the heavy ball would touch down first![/quote]

You and every other scientist. The pheonmonon was forst recorded by the ancient greeks and has remained a mystery ever since.

Here's another.

http://en.wikipedia.org/wiki/Riemann_hypothesis

The Reimann Hypothesis. Simple question, prove whether it is true or False.

The Prize: At least $1m, Probably the Nobel Prize for Mathematics plus many more accolades.

[Col]

OK hands up all those who understood The Reimann Hypothesis :-? :-? :P

[Jon_W]

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