Re: Force and motion...
From: Old Man (nomail_at_nomail.net)
Date: 01/17/05
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Date: Mon, 17 Jan 2005 17:30:15 -0600
"Externet" <externet@inorbit.com> wrote in message
news:1105982923.290570.248130@z14g2000cwz.googlegroups.com...
> Hi. Thanks for replying.
> You expect a "how much?" ... Let's change it to how long?
> A comparatively small force applied to the moon, if sustained long
> enough, will then change its orbit.
> Actually, ANY propulsion force even a small one, will cause an
> proportionally small change of orbit.
> Will it?
> To continue, step by step...
An orbit is uniquely defined by its total energy, E, and its
orbital angular momentum vector, L.
Whilst conserving orbital angular momentum, the orbit's
energy can be altered via a radial impulse.
Whilst conserving energy, the orbit's angular momentum
can be altered with torque and radial impulses combined,
such that, at a given point, orbital speed is maintained
under a change in orbital velocity direction.
[Old Man]
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