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imatfaal

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Everything posted by imatfaal

  1. 3. Which probes have even small accepted anomalies - btw the answer isn't either of the voyagers
  2. [mp][/mp] 1. The Allais effect is hardly a solid foundation upon which to build the edifice of your theory. 2. Your resistance to motion which you describe as a acceleration has units of speed
  3. Fejl! Henvisningskilde ikke fundet
  4. I have a feeling that we can mathematically prove that there can exist no self-consistent and non-arbitrary schema which would allow push gravity which includes mass dependence, the inverse square law and conservative forces
  5. Frequencies are close but not exact. Frequencies waver and have seriously complicated natural harmonics (the timbre of the instrument) Even a pure sound is not a single frequency but a large spectrum with a dominant peak You do get nodes and antinodes but they are a tiny fraction of the overall sound
  6. Momentum is conserved - photon momentum is well defined (and only depends on wavelength as a variable for the magnitude of the momentum). You can thus predict the outcome for a high energy photon hitting an elextron with a calculation based on Compton Scattering equations - or by using the momentum (relativistic) energy 4 vector and switching frames with lorentz transforms
  7. I am not sure there is a great and complete explanation - the root cause is as I suggest above; if you think about it when the gas exerts a force on the surface then they must be a reactive force as a newtons third law pair. If the surface is mobile the surface moves - but if the surface is fixed all we can observe is the gas moving under the reactive force. This is basically Maxwell's explanation as far as I can tell from scraps. This paper seems to suggest that as heuristics go this is as goods as it presently gets Journal of the Physical Society of Japan. Vol. 67, No.7, July, 1998, pp. 2277-2280. Maxwell's Thermal Creep in Two Space Dimensions. Koichiro SHIDA williamhoover.info/Scans1990s/1998-8.pdf Possibly - but I don't know what causes the counter-current. I would say no as the situation is not similar - you only have one flow in thermal transpiration ; ie not a strong flow and a weaker counter-flow. Thermal creep happens in a good vacuum where a molecule is about as likely to cross from one side of container to the other unhindered as it is to hit another molecule - this does not sound like a good parallel to a fast flowing river
  8. Because the quantum information is completely useless unless read in conjunction with the classical information - so the speed of transmission is the speed of the transmission of the classical information. To teleport a quantum state relies on a previously shared bell pair which is transformed via unitary translation and measured by the sender - the results of the measurements are passed on which allows second party to perform (or not)unitary translations on his half of the bell pair and his half of the bell pair ends up in the same as the senders[vastly simplified]. The quantum state has been teleported (not reproduced as the initial copy is lost in measurement) at the cost of two bits of classical information and the loss of the bell state pair
  9. Random chance - there are molecule moving in every direction. Some hit the edge The pressure explanation was actually debunked by no less a physics superstar than James Clark Maxwell - who loved the idea; but having had egg on his face from already supporting the erroneous radiation pressure explanation (if it were radiation pressure then the white side which is reflecting photons is under higher force than the black side which is absorbing - remember momentum is conserved) went through the maths with a fine toothed comb and found that the increased pressure on the black / hotter side did not cause a motive effect. Reynold's heat transpiration - in the presence of a porous membrane gas will flow from the colder side to the hotter side and create a pressure gradient. The vanes of a crooke's radiometer are not porous - but thermal transpiration works because of the edges of the pores (ie those surfaces at right angles to the main face) and the vanes do have edges and these are enough. You can think of it in two ways - in the manner I outlined above with different tangential component forces from molecules from hot and cold side or in the following way which is not better but fits better with the thermal transpiration idea. The gas molecules tend to flow from cold to hot near the edges - so there is a net movement at the edge from the cold white side to the hot black side, thus the pressure increases locally at the hot black side, thus the vane experiences more force on the hot black side than the cold white, the the vane moves, the pressure equalised and it all starts again.
  10. thermal transpiration or thermal effusion are the terms I have heard used. And yes this is the accepted explanation for the Crooke's radiometer. It is an effect driven by the difference in energy and momentum (and thus force when undergoing an acceleration change when colliding) in gas molecules approaching the edge from the hotter black side and those approaching the edge from the cooler white side - on average the (tangential component) of the force exerted on the edge will be greater from those molecules on the hotter side. As a tiniest bit more force is exerted on the edge by molecules from the black/hotter side than the white/colder side then there is a net force which causes rotation - as the resultant force is directed from the black side it rotates in with the white side leading. I am struggling to find a nice reference for the general effect
  11. No - you will at best be able to show wave-like behaviour not particle-like behaviour; remember Young's experiment was designed in the time of the disagreement between Huygen's wave structure of light and Newton's corpuscular. Fresnel building on Young's work succeeded in convincing most of the science community that Huygen's waves were the correct model. Overly simplistically - If they were particles (acting classically) you would get two strips of lights aligned with the direct path (with blurring when there was a slight reflection off the edge of the slit. But what you actually get is an interference pattern - to demonstrate the particulate side of the nature of a quantum mechanical entity you need which-way information (or some other form of breaking the interference). Last time I actually did this experiment was 25 years ago - and then buying a pre-slitted blackened piece of glass was pocket-money cheap.
  12. Clusters are homogeneous throughout the universe therefore their overall net effect would be the same throughout the universe. And even saying that; for the time that the CMB photons have been travelling before reaching up, 13.7ish billion years, the time spent around centres of mass will be vanishingly small - any change would be a tiny, statistically unrecognizable error rather than a paradox. So clusters don't really matter in the wide scheme of things and would not change the isotropic nature anyway even if the effect was bigger
  13. It seems to boil down to <<If we now state that the universe is neither isotropic nor homogeneous on a large scale will the predictions we have made on the basis of the seemingly correct assumption that the universe IS isotropic and homogeneous still hold?>> Not necessarily no - and we lose our power to predict. Our predictions so far are very very accurate - therefore we choose to keep our assumption that the universe is isotropic and homogeneous on a large scale
  14. more than a semblance as any fule kno
  15. A 7-body problem? Good luck with that. BTW - have a read of the Three Body Problem - Liu Cixin
  16. Not sure if "Greek thought" could have influenced Judaism in its early stages that much. Moses probably pre-dated the Fall of Troy, the epics ie Iliad surrounding that period of history only really solidified a few hundred years later, and did not really form the basis of a national/tribal founding mythology for another 2-300 years. The archaic and oldest section of Greek civilisation was around 4-500 years after Moses was supposed to have lived. Abraham is postulated to have been around the time of Hamurabi.
  17. Yes - I have a horrible feeling I am. After reading yours I went on a 20 second google-jaunt for a representative photo of a sportsman in a god-like pose. I started with Jonny Wilkinson - English rugby player who had the requisite greek-god looks. This photo (even sans face) summed it up - but my instinct to look up "Sir Jonny" was doubly vindicated when I noticed the film documentary about his part of England's World Cup winning squad was titled "Building Jerusalem" Jonny, Martin, et al made everything all right for just a little while. His glory, his epic song, his life is the new homeric tale, his kleos remains and will persist. Ok so all a bit tongue in cheek - But then I was in Brixton last night and the outpouring of grief for the Bowie aka Thin White Duke aka Aladdin Sane aka Ziggy Stardust (hmm he has avatars for different parts of his work - seems pretty godlike to me) was immense and the loss tangible. PopStars and SportingHeroes - better than Warriors and Kings in my opinion
  18. Which of course is what we do now that our religions no longer provide
  19. I have mentioned it to Capn R
  20. To be honest proposals for new laws like the above make me think for a second (but only for a second) that maybe owning a firearm to protect myself and my family from the government isn't such a bad idea. Then I come back down to earth and realise what a wingnut plan that is - and how glad I am that I do not have to suffer the liberties of the land of the free
  21. SO sad to hear - but he went with the love and in the arms of someone who cared greatly
  22. You can actually insert a divider if you feel the need [mp][/mp] the above is a merged post divider - accessed from the third button from the left on the top row
  23. ! Moderator Note I have split off Kalopin's post and two follow ups to it. This is Arc's thread within which he gets to test his theory and defend it against all-comers. It would get confusing if we allowed more than one speculation in a single thread - and we have plenty of digital real estate so I have created a new thread for Kalopin's idea. If you would like me to rename the new thread then PM me
  24. Actually it is fairly well agreed that Einstein never said that - it is quoted in a psychobabble psychotherapy text but no-one really believes it was AE, especially as the same author, in latter works, removed the attribution. "La bêtise humaine est la seule chose qui donne une idée de l'infini" - Ernest Renan seems to be a possible original source Or they cannot put aside the time to engage in a drawn out discussion, or for many other reasons which would be off-topic to post about The reputation system is there for members to make immediate and anonymous marks For or Against a post and some use it for just that; your imputation of cowardice or inability to make an argument is presumptive and, I think, incorrect. However - if you wish to make a thread about reputation please do it in the Suggestions Forum; preferably after reading a couple of the long threads we have already had on this topic.
  25. Do you mean in metal-graphite compounds (MetalC6 and MetalC8)? Would be better to ask in Chemistry in that case. Like Sensei I don't immediately see an Engineering connexion with your question
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