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>> Earth is rotating. If the Earth rotated at the right speed then there
>> would
>> essentially be no downwards force (at least on the equator) and
>> everything
>> would float.
>
> Question: Wouldn't it be more accurate to say that everything in
> contact with the Earth's surface would float?
No, even things in the air would appear to float because everything is going
at the right speed to essentially "orbit" the Earth (ok a few m/s difference
between 6400km and 6400.001km from the centre, but...).
Just like if you fire a rocket horizontally at the right speed (with no
drag, eg on the moon) it will stay at exactly that height and orbit the
moon. Spinning the Earth fast enough would essentially make everything
orbit the Earth around the equator, the force of gravity would be exactly
right to keep everything floating at that speed.
But also the air would be floating now, so who knows what would happen to
the atmosphere!
Oh and you might get a headache from the very fast day/night cycles ;-)
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