Helium balon sonda

[Daniel Valuch]

hmmm bolo by zaujimave vidiet matematicky dokaz (pokial by som ho vedel 
pochopit).
b.


On 4/18/2012 12:14, Snail Instruments wrote:
>
>> Je to typicky pripad kedy treba presne pocitat blizke pole a nesmie sa
>> aproximovat bodovym zdrojom.
>
> http://en.wikipedia.org/wiki/Gravity_of_Earth
>
> Veticka v druhe tretine clanku:
> "Note that this formula only works because of the mathematical fact that
> the gravity of a uniform spherical body, as measured on or above its
> surface, is the same as if all its mass were concentrated at a point at
> its centre. This is what allows us to use the Earth's radius for r."
>
> Rekneme, ze z matematickeho hlediska jsme meli vic stesti nez rozumu :-)
>
> J. Hanzal
>