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Thread: A very stupid question

  1. #1 A very stupid question 
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    I fear thsi is a very stupid question... but i thought i'd post it anyway.

    I beleive I read that if you took a spinning ball, it would be equally as true to say that the ball is still and everything else is spinning around it.

    if this is the case then if you took a ball of say... "sand" and spun it in outer space.. would it fly apart (if you spun it fast enough).

    and more to the point... if the ball of sand was still and you spun the entire universe around it.. would it also fly apart?


    When all you have is a hammer, every problem starts to look like a nail.
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  3. #2  
    Forum Radioactive Isotope mitchellmckain's Avatar
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    No, a spinning ball is not an intertial frame. Certainly no physics less that General relativity could postulate such an equivalence. General relativity postulates an equivalence in the case of one kind of non-inertial frames: the inside of an elevator that is accelerating and the inside of a motionless elevator in a gravitational field with the same gravitational acceleration. I doubt but do not know if a similar equivalence could work with a rotating frame.


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  4. #3  
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    Don't worry BraveBen. There is no such thing as a stupid question here.
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  5. #4  
    Forum Professor Zwolver's Avatar
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    just stupid answers

    sorry, but the question was quite smart. i think that the rotational force of the universe rotating around the ball would be impossible, because we all look from great to small, and that would say that in what way you would see it, it would all be the ball who was spinning.

    the universe can not be compared with something greater, or we just can't imagine or understand it.

    cheers :wink:
    Growing up, i marveled at star-trek's science, and ignored the perfect society. Now, i try to ignore their science, and marvel at the society.

    Imagine, being able to create matter out of thin air, and not coming up with using drones for boarding hostile ships. Or using drones to defend your own ship. Heck, using drones to block energy attacks, counterattack or for surveillance. Unless, of course, they are nano-machines in your blood, which is a billion times more complex..
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