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A tensor equation that is valid in any coordinate system is valid in every coordinate system.

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  1. Gerry Nightingale
    Gerry Nightingale liked post by KJW On thread : SPLIT : Farsight's Comments
    Galileo's ship is saying that the laws of physics are the same for different constant velocities. That is also what Einstein's second postulate is saying.
    Liked On: 08-27-2014, 02:57 PM
  2. Gerry Nightingale
    Gerry Nightingale liked post by KJW On thread : SPLIT : Farsight's Comments
    The way I see it, it is about our desire to understand the nature of reality at ever-increasing energy scales. In the beginning of subatomic particle research, observations of cosmic particles have...
    Liked On: 08-26-2014, 02:07 AM
  3. Boing3000
    Boing3000 liked post by KJW On thread : SPLIT : Farsight's Comments
    Good. "Laws of physics" is just a concise way of describing in general terms the outcomes of all physics experiments. The second postulate basically says that observers who are in motion...
    Liked On: 08-24-2014, 05:21 PM
  4. Physicist
    Physicist liked post by KJW On thread : How do we know that black holes form?
    There is no "critical density". Larger blackholes are less dense than smaller blackholes. To form a blackhole, it is sufficient to place enough mass into a small enough space. But because very large...
    Liked On: 08-24-2014, 11:40 AM
  5. Jilan
    Jilan liked post by KJW On thread : SPLIT : Farsight's Comments
    Do you have any observational evidence to back this statement?
    Liked On: 08-24-2014, 10:20 AM
  6. TFOLZO
    TFOLZO liked post by KJW On thread : Twin Paradox
    One can also consider the Doppler shifts of the light from each twin to the other twin. It's true for both twins that when the other twin is seen to be moving away, the light will be Doppler...
    Liked On: 08-20-2014, 07:40 AM
  7. Scheuerf
    Scheuerf liked post by KJW On thread : Twin Paradox
    One can also consider the Doppler shifts of the light from each twin to the other twin. It's true for both twins that when the other twin is seen to be moving away, the light will be Doppler...
    Liked On: 08-18-2014, 12:52 PM
  8. Markus Hanke
    Markus Hanke liked post by KJW On thread : Why can't we go faster the speed of light?
    One need not invoke infinite energy to answer this question. One can simply apply the principle that all inertial frames of reference are equivalent. In particular, the speed of light in a vacuum is...
    Liked On: 08-12-2014, 06:27 PM
  9. johnzxcv
    johnzxcv liked post by KJW On thread : Why can't we go faster the speed of light?
    One need not invoke infinite energy to answer this question. One can simply apply the principle that all inertial frames of reference are equivalent. In particular, the speed of light in a vacuum is...
    Liked On: 08-12-2014, 12:25 PM
  10. Boing3000
    Boing3000 liked post by KJW On thread : Why can't we go faster the speed of light?
    One need not invoke infinite energy to answer this question. One can simply apply the principle that all inertial frames of reference are equivalent. In particular, the speed of light in a vacuum is...
    Liked On: 08-11-2014, 08:37 PM
  11. Jilan
    Jilan liked post by KJW On thread : Black hole in uniform mass density
    MODERATOR NOTE: Jilan is correct. This is a forum for people with various levels of knowledge of physics, not necessarily professional physicists. Therefore, people posting on this forum should not...
    Liked On: 08-10-2014, 05:26 PM
  12. Jilan
    Jilan liked post by KJW On thread : MarkMason's Conundrum.
    I'm not suggesting that my example is the same as time dilation. The point of my example is to demonstrate that an apparent paradox (I see you earlier than me and you see me earlier than you) need...
    Liked On: 08-04-2014, 06:33 PM
  13. Jilan
    Jilan liked post by KJW On thread : Why can't we tell exactly location of a electron moving through out space but only its probability?
    Because diffraction is a consequence of Huygens-Fresnel principle and is independent of charge. By greatly reducing the intensity of the beam of particles, one can ensure that statistically...
    Liked On: 07-28-2014, 09:16 PM
  14. Beer w/Straw
    Beer w/Straw liked post by KJW On thread : The God's eye global gist of general relativity
    You say this as an attempt to justify not doing any mathematics, don't you? But mathematics is the language of physics. Physical reality is far too complicated to be described by any language other...
    Liked On: 07-21-2014, 11:18 AM
  15. lpetrich
    lpetrich liked post by KJW On thread : The God's eye global gist of general relativity
    You say this as an attempt to justify not doing any mathematics, don't you? But mathematics is the language of physics. Physical reality is far too complicated to be described by any language other...
    Liked On: 07-21-2014, 08:17 AM
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