At 08:49 PM 12/4/01 -0500, Sean H. Breheny wrote:
>Hi Jinx,
>
>That would probably produce an interesting kind of precession, but
>"levitation", in the sense of being able to hold something up against
>gravity without applying an external force to it, is definitely not
>possible (under our current understanding of physics).

I'm intrugued as to how you are supposed to set this rotating, without
applying some force.
If such an antigravity force is produced (how does it know what vector to
take?) then presumably left on it's own, it would counter rotate, and relax
to a neutral position.

Is the force expended to turn it somehow less than the "anti-gravity"
force? Most likely not.

I think in the end, this will prove to be another byzantine illustration of
the second law, and you could get more upward force just by pushing upward.


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