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Re: Centrifugal force



At 7:59 PM -0700 4/30/98, Leigh Palmer wrote:
Think about Donald's hovering rocket ship (a nice improvement on
Einstein's elevator). I don't have the quote around, so I'll make
up my own. A rocket ship hovers one meter above its launch pad.
In the laboratory within an astronaut performs physical experiments
(with all manner of apparatus, lasers etc.). At one instant in time
God picks up Her fungo bat and decides to improve the situation in
the universe by removing the Earth with the speed of light to the
most remote place possible. The feat is accomplished in a direction
which is horizontal at the pad. The astronaut feels, perhaps, a
slight bump as the solar system is cleansed, but he continues with
his experiments and notices no difference whatever in the results
he obtains with those obtained in the same experiments before. The
rocket ship lab is and always was the same sort of frame of
reference, clearly not an inertial one.

Leigh

GREAT thought experiment!!!! Thanx all!

Next question. Let's ignore the 'slight bump' but keep in mind that the
rocket DOES have a finite size. If our experiments are accurate enough can
we not measure that two falling objects in the rocket will move closer to
each other because of the non-uniformity of a 'real' gravitational field,
than they would when the acceleration is 'caused' by the rocket blast?

I'm familiar with the word 'local' used to describe the principle of
equivalence and GR, but is there a fundemental arguement that forbids our
experimentally distinguishing between the divergent gravitational field and
the uniform acceleration of the rocket??

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