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Thread: Instability or a Body Rotating About a Minor Axis In Space - Cool Video

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    Instability or a Body Rotating About a Minor Axis In Space - Cool Video

    Freedom Takes "I Won't". - Eric Frank Russell

    Trump has been President for 155 days and Ruth Bader Ginzberg hasn't had the decency to die. What's up with that?

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    interesting . . .

    I had to watch with sound off. Does he explain the theory behind this?
    Originally Posted by sooda
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    Quote Originally Posted by Rickity Plumber View Post
    interesting . . .

    I had to watch with sound off. Does he explain the theory behind this?
    No, but it's about energy transfers between two different slightly unstable modes of rotation about a minor axis of inertia.

    The major axis of inertia would be parallel to the axis of the bigger cylinder, but offset by some fraction due to the mass of the stem sticking out. If it had been spun through that axis, it would have been more or less happy and

    But this object is rotating about the lesser axis through the stem and it wobbles slightly, and as the wobble gets farther away from the principal axis, it gets more unstable and then it slips into the other mode.

    The math is both complicated....and something I haven't reviewed since 1990.
    Freedom Takes "I Won't". - Eric Frank Russell

    Trump has been President for 155 days and Ruth Bader Ginzberg hasn't had the decency to die. What's up with that?

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    Conservative Libertarian (04-19-2017),Rickity Plumber (04-19-2017)

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    Freedom Takes "I Won't". - Eric Frank Russell

    Trump has been President for 155 days and Ruth Bader Ginzberg hasn't had the decency to die. What's up with that?

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