Are "weightless rooms"( where gravity is nonexistent) on earth possible as seen on Tom & Jerry and Bugs Bunny?
There is no way at present to shield gravity. A weightless room can
be made for a short time by accelerating the room. For example, if
you were to step into an elevator, and the elevator fell down
the shaft (assuming no braking, air resistance, etc..), you
and everything else in the elevator would be weightless (until you
reached the bottom). This can also be accomplished in an airplane
for a short time by flying in a particular arc. The general truth
here is that gravity effects us exactly like acceleration. You
need only accelerate to change your apparent gravity.
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Update: June 2012