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Flat Earth General / Sandokhan and Gravitation etc
« on: November 25, 2019, 12:34:05 AM »
Sandokhan has been continually spamming of the "Radar ranging in the Solar System" thread with completely irrelevant material.
So I'll try to answer his posts here.
Part the background of GR was Einstein noting that there were two definitions of mass for the same object.
One is the inertial mass as in force = massinertial x acceleration
and the other is the gravitational mass as in force = (G x Mgrav x massgrav) / d2..
Yet in every case massinertial = massgravmassgrav.
Having two definitions for the one mass seemed incorrect to Einstein and so to cut things short he saw that the force that we call gravitation is really an inertial force and not an attractive force as Newtonian Gravitation appears to be.
Here's some entertainment for you:
General relativity explained in under three minutes
But to date General Relativity and Quantum mechanics are not compatible for a number of reasons.
They use Newton's Laws of motion an universal gravitation where it is sufficiently accurate simply because it is so much simpler to work with.
But Cosmologists and particle physicist certainly use relativity in many situations.
The bottom line is that however much you wriggle and squirm General Relativity is by far the best explanation of gravitation and mechanics that we have to date.
But that does not mean that it will not be modified, updated or changed in some way.
Do you have a better theory that let's you do real calculations for things like, say, the propagation time for light or other EM radiation to and from the Moon, Venus and Mars at any specified date?
So I'll try to answer his posts here.
"Four trillion billion liters of water stay in place next to the outer surface of a sphere" by exactly the same thing that stops YOU flying off into space and that is gravitation.Who says it does? But I'm still waiting for your explanation the attractive mechanism that stops YOU flying off into space.
Please describe the attractive mechanism by which a molecule of water is attracted by the Earth's iron/nickel core.
Quote from: sandokhan
When velocities become appreciable compared to c or when close to huge masses Einstein's General Relativity gives the best current solution.No, that's you!
You still seem not to understand what is going on.
Quote from: sandokhan
General relativity HAS NO MECHANISM WHATSOEVER TO DESCRIBE GRAVITY.Incorrect.
Quote from: sandokhan
General Relativity postulates that gravity is a curvature of spacetime created by mass, but it does not explain how that curvature occurs. Actually, it is just a DESCRIPTION that leaves unanswered the key question of exactly how matter affects space and time.No matter how deep you go there are always are deeper levels. In your hypotheses please explain exactly why there is a far higher density of aether around Venus than the Moon. Careful how answer because there might be a trap.
Quote from: sandokhan
Dr. Erik Verlinde:That's totally wrong! General Relativity describe's precisely in which way mass and energy affect spacetime but maybe it does not answer why - ask a physicist.
General Relativity remains just a description of the force we call gravity. It leaves unanswered the key question of exactly how matter affects space and time.
Quote from: sandokhan
General Relativity HAS TO rely totally on Newton's ATTRACTIVE MODEL.No GR does not rely on Newtonian Gravitation.
Part the background of GR was Einstein noting that there were two definitions of mass for the same object.
One is the inertial mass as in force = massinertial x acceleration
and the other is the gravitational mass as in force = (G x Mgrav x massgrav) / d2..
Yet in every case massinertial = massgravmassgrav.
Having two definitions for the one mass seemed incorrect to Einstein and so to cut things short he saw that the force that we call gravitation is really an inertial force and not an attractive force as Newtonian Gravitation appears to be.
Here's some entertainment for you:
General relativity explained in under three minutes
Quote from: sandokhan
This is what you wrote earlier:You refuse to answer the simplest question so why should I bother with that? Go ask a physicist!
The huge mass of the Earth bends spacetime
Explain to your readers HOW mass bends spacetime. You haven't done so at all.
Quote from: sandokhan
No one else can explain how mass/matter interacts with spacetime, not even Einstein.Have you asked everybody, including Einstein?
Quote from: sandokhan
Feynman resolved the energy-momentum tensor problem by the field approach: the gravity force between Newton's apple and the Earth is caused by the exchange of gravitons. Gravitons (real and virtual) are mediators of the gravitational interaction.I seriously doubt that Feynman went further than suggesting that gravitons might be the gravitational analog of photons in electromagnetism and could tie gravitation into quantum mechanics.
But to date General Relativity and Quantum mechanics are not compatible for a number of reasons.
Quote from: sandokhan
Then, you have a huge problem: how do gravitons produce curvature?Nobody says that they do.
Quote from: sandokhan
Again, general relativity DOES NOT offer any kind of a mechanism.No they do not "rely on Newton's attractive gravitational model".
That is why physicists have to rely on Newton's attractive gravitational model.
They use Newton's Laws of motion an universal gravitation where it is sufficiently accurate simply because it is so much simpler to work with.
But Cosmologists and particle physicist certainly use relativity in many situations.
The bottom line is that however much you wriggle and squirm General Relativity is by far the best explanation of gravitation and mechanics that we have to date.
But that does not mean that it will not be modified, updated or changed in some way.
Do you have a better theory that let's you do real calculations for things like, say, the propagation time for light or other EM radiation to and from the Moon, Venus and Mars at any specified date?