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Einstein relativity is wrong
(Fig.1) The circumference of a rotating rigid disc is Lorentz-contracted or not is paradoxical..
In the upper Fig.1, a rigid disc with the radius R (= so the circumference is 2πR ) is rotating at a velocity of v.
According to unphysical Einstein special relativistic Lorentz length contraction, this circumference of the rotating (= moving ) disc must be contracted to 2πR√1-v2/c2, because all points on the circumference is moving in the tangential direction (= Lorentz length contracted ) in the rotating disc.
But the radius R remains the same (= radius R is Not Lorentz contracted ), because the rotating disc is Not moving in radial or radius direction.
As a result, the circumference must remain 2πR.
↑ The circumference of the rotating rigid disc is contracted or Not contracted, which is clearly contradiction called Ehrenfest paradox showing Einstein relativity is wrong.
↑ The observer is stationary (= Not rotating, so inertial frame ), watching the circumference and radius from the stationary center C (= hole ), which has nothing to do with general relativity related to the accelerating frame (= seen by accelerated observers, this p.3-5 ).
There is No solutions of this Ehrenfest paradox, as this p.1-right-last-paragraph (in 2023) says
"Many attempts have been made to analyze the
paradox especially for the rotating disk but there is No
general consensus in literature on the solution of the
problem"
This p.5-left tried to solve this paradox using the false assumption that the circumference of the rigid disc is elongated by the rotation (by some unrealistic, non-existent force ), which could cancel the Lorentz contraction.
↑ But it is impossible to elongate the rigid disc just by rotating it (= and the acceleration in tangential direction on the disc rotating at the constant velocity is zero, which cannot elongate the circumference ), so still No solutions to this Ehrenfest paradox.
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