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|    rec.arts.sf.science    |    Real and speculative aspects of SF scien    |    45,986 messages    |
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|    Message 45,671 of 45,986    |
|    eripe to Bob Jenkins    |
|    Re: earth space elevator, moon, tilt    |
|    17 Sep 19 18:22:03    |
      From: eripe.dk@gmail.com              On Tuesday, September 17, 2019 at 10:12:38 PM UTC+7, Bob Jenkins wrote:       > On Monday, September 16, 2019 at 5:03:11 PM UTC-7, eripe wrote:       >        > > The force from the moon is tiny compared to the self correcting force to       the rotating plane. If the station is 1° off that plane it will be pulled       back by a force of sin(1)= 1,7% of its mass.        > > The moon can only make it wobble a widdle.       >        > What assures that the rotating plane of the elevator remains the plane of       the equator?              Short answer: The moment of inertia.              Another way of thinking about it is that the plane is where the system has the       lowest amount of mechanical energy (kinetic + potential), so that's where it       wants to be.       That said, if a oscillation (wobble) begins, you have to watch it and have       means to dampen it out. Without resistance to movement in space it will       oscillate forever, and if the cause is in sync with the natural frequency of       the system it will continue to        grow.              The amount of force you mentioned first is however so small that you should be       able to counter it by opening a window for a few seconds.              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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