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Since Galileo Galilei and Newton, the assumption is valid that inert and heavy mass are equivalent. This is, however, questioned by new physical theories such as the String theory.
Now, the equivalence principle is put to test with so far unachieved accuracy within the scope of the "Microscope" space project - a German-French cooperation. PTB has developed the manufacturing and measuring methods for the test masses which are required for the acceleration experiments in a near-Earth orbit, and has manufactured the first test pieces.
Podkletnov's Force Beam During experimentation with colleague Giovanni Modanese, Podkletnov found that by stimulating a rotating superconductor with a high-voltage electrical arc, a beam of force was created that is currently unexplained by contemporary physics. The "mystery-force" appears to have a repulsive effect on nearby materials, and appears to be a focused beam of force, although the exact nature of the force that causes the repulsion is still under scrutiny.
Here, however, we encounter a conceptual difficulty. Suppose to place on the trajectory
of the beam a very massive pendulum (say, 103 Kg). If the effect is gravitational, then
the acceleration of a test mass should not depend on its mass. However, it is clear that in
order to give this mass the same oscillation amplitude of the small masses employed in the
experiment, a huge energy amount is necessary, which cannot be provided by the device.
Therefore the effect would seem to violate the equivalence principle. Considering the backreaction
is probably necessary, namely the fact that the test mass exerts a reaction on the
source of the impulse. This reaction is negligible as long as we use small test masses.
Originally posted by adrenochrome
i've been to the americanantigravity site before, but your link isn't working for that page...
i'm curious to see what kind of result they get! when do we get this puppy goin'?!