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1400 years ago nobody knew about the Equivalence Principle however it was portrayed in the Quran.
In the Quran mass balance on Earth and acceleration are mentioned together. Skeptics claim that whoever wrote the Quran made a mistake; a mass balance will always work on Earth or in zero G, no need for any acceleration. Today scientists confirm that the mass balance only works on Earth or in an accelerating frame, never works in zero G.
1400 years ago people used the mass balance, however nobody knew that it doesn't work in zero-g.
Equivalence principle
In the theory of general relativity, the equivalence principle is the equivalence of gravitational and inertial mass, and Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.
Wikipedia , Equivalence Principle, 2021
There is no difference between an experiment on Earth and an experiment on an accelerating spaceship. However this is not true for zero-g. The mass balance doesn't work in zero-g. If you put a mass on just one side then it won't tilt in zero-g. If the spaceship accelerates then this mass balance will work again as if it were still on Earth. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered.
And the sky, He raised; and He set up the balance.
٧ وَالسَّمَاءَ رَفَعَهَا وَوَضَعَ الْمِيزَانَ
If God raised the sky then this an accelerating frame in outer space. And in the same verse the mass balance is on Earth. Today we know why they are in the same verse, because the mass balance only works in these two conditions: Gravity and/or acceleration.
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