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Is there really such a thing as true "kinetic energy"? I mean according to "Relativity Theory", nothing really moves. It just depends on how you look at it.For example, when you look at the Sun from a place on Earth, the Sun looks like it's moving across the sky. That movement must give it kinetic energy.But when you look at the Solar System from outside, the Sun stays still, and it's the Earth that's moving, so the Earth must have kinetic energy.It seems therefore that both the Sun and the Earth have kinetic energy. But how do you measure it?
so it's only negative in relation to You doing work to it, or a mathmatical principle of an equation, not a physics.
You have to understand that Mr. Duffield has a book to sell and a pet idea to peddle. He has admitted many times that he doesn't actually do physics problems.
Einstein made it clear that gravitational field energy is positive, and that this energy has a gravitational effect.
Quote from: JohnDuffield on 07/03/2017 19:41:59Einstein made it clear that gravitational field energy is positive, and that this energy has a gravitational effect. An impossibility, positive v positive = expansion not contraction.
Quote from: Thebox on 07/03/2017 20:12:04Quote from: JohnDuffield on 07/03/2017 19:41:59Einstein made it clear that gravitational field energy is positive, and that this energy has a gravitational effect. An impossibility, positive v positive = expansion not contraction. Exactly!
An impossibility, positive v positive = expansion not contraction.
Ok John can you list some of the exact solutions to the Einstein field equations that have been found. I can check the answers for you if you like. Seeing as you are such an expert relativist. Oh and not to include the Schwarzschild or Kerr type solutions.
Quote from: Thebox on 07/03/2017 20:12:04An impossibility, positive v positive = expansion not contraction.It's not an impossibility, it's general relativity. Check out the stress-energy-momentum tensor that "that describes the density and flux of energy and momentum in spacetime". It's the energy-density gradient that makes light curve and matter fall down. Also see the Einstein digital papers: "the energy of the gravitational field shall act gravitatively in the same way as any other kind of energy".
Likewise polarities repel each other, do you agree with that?
Quote from: jeffreyH on 07/03/2017 21:38:44Ok John can you list some of the exact solutions to the Einstein field equations that have been found. I can check the answers for you if you like. Seeing as you are such an expert relativist. Oh and not to include the Schwarzschild or Kerr type solutions.See the scholarpedia article by Malcolm MacCallum. It perhaps gives you what you're looking for:http://www.scholarpedia.org/article/Exact_solutions_of_Einstein%27s_equations#Some_important_solutions