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Wolfgang S. Rupprecht wrote:
Swirling the atmosphere to the west (effect of exhaust gas) and thus slowing
the Earth down?
Mike.
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Sam Wormley wrote:
> On 3/10/10 2:17 PM, Mike Coon wrote:
>> Wolfgang S. Rupprecht wrote:
>>> Or the effect of NASA launching most of the rockets towards the
>>> east...
>>> east...
>> Swirling the atmosphere to the west (effect of exhaust gas) and thus
>> slowing the Earth down?
>> Mike.
>> slowing the Earth down?
>> Mike.
> Yup, Momentum, Angular Momentum and Energy are all conserved in
> closed systems.
> closed systems.
Erm, where's the closed system? There aren't many real ones about. though
it's a good abstract idea. And what's it got to do with burning rocket fuel
to get mechanical energy and momentum?
Mike.
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J. J. Lodder wrote:
> Invoking angular momentum conservation
> saves a lot of argument.
> saves a lot of argument.
But is still tricky. When a spacecraft fires its jets to rotate it rather
loses the "angular momentum" of the gas that shoots off into space...
Mike.
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Sam Wormley wrote:
> When you take into account the spacecraft AND the expelled gas, the
> conservation laws hold for the spacecraft-gas system. It cannot be
> any other way.
> conservation laws hold for the spacecraft-gas system. It cannot be
> any other way.
Correct. The trickiness is not in the physics but in remembering to have the
right definition of "system".
Mike.
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> east...