Le 08/03/2011 16:48, Alain a écrit :
> Gravity is highest at the exterior equator and null at the interior
> equator.

I would question that second part for a demonstration.

Null at the center, ok.
Highest on the exterior equator, ok.
But null at the interior equator, it might depend on major & minor radius.


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Le 2011/03/08 11:13, Le_Forgeron a écrit :
> Le 08/03/2011 16:48, Alain a écrit :
>> Gravity is highest at the exterior equator and null at the interior
>> equator.
>
> I would question that second part for a demonstration.
>
> Null at the center, ok.
> Highest on the exterior equator, ok.
> But null at the interior equator, it might depend on major&  minor radius.
>
>

At the interior equator, and anywhere on the disk it define, the gravity 
is null. The mass under you is closer, but the mass over you is larger.

But, you will not notice that as the planet is spining on itself: the 
centrifugal force will keep you on the ground. It will also somewat 
offset the gravity bias.



Alain

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On 3/10/2011 10:59 AM, Alain wrote:
> At the interior equator, and anywhere on the disk it define, the gravity
> is null. The mass under you is closer, but the mass over you is larger.

And just how did you determine that these two factors exactly cancel out 
at the interior equator?

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Alain <aze### [at] qwertyorg> wrote:
> At the interior equator, and anywhere on the disk it define, the gravity 
> is null. The mass under you is closer, but the mass over you is larger.

  Can you actually prove that?

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