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swansont

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Everything posted by swansont

  1. I’m not sure why they would accelerate away. There could be an electrostatic force, but this typically has a small energy compared to the interaction energy. e- and e+ for example (creation or annihilation) - the mass energy is around 1 MeV but the electrostatic PE is of order 10 eV Owing to the uncertainty principle(s) you don’t get to “look” at the interaction in arbitrarily fine detail of whatever variable (e.g. position, momentum) You look at the start and end of the interaction and apply conservation laws - momentum, energy, charge, angular momentum You can treat the acceleration of a free electron classically.
  2. What would be a comparable situation? Cases I can think of where acceleration matters are where you’d treat the particle classically. In quantum systems you’d look at the energy of an interaction.
  3. WalidKhan suspended for spamming
  4. All of physics is a technicality. If you’re going to use a scenario, you need to represent it properly, so that everyone is discussing the same thing.
  5. The twins are the same age at the start of the scenario. One is younger at the conclusion of the experiment. They never “reach” the age of the other.
  6. It was not just one post; this was merely the straw that broke the camel’s back. Your previous responses in the thread were flippant. You answered yes to a question and when you were asked for a citation you simply posted a picture of a magic 8-ball showing ‘yes’ Despite your claim here, there were serious responses in the thread. Elsewhere you had posted a stock discussion in quantum theory. You’ve posted pictures in other threads that did not contribute to the discussion. I recall trying to give you feedback about this, which you rejected. We reached saturation with that behavior. You can learn from it, or not
  7. That wasn’t your original assertion. “When you look at the Cube it contains a point to point line, a square and a Cube, could this be written 1m¹+1m²+1m³, would this equal 3m⁶ equalling 729m?” The equation is incorrect. Nonsensical, in fact. It is in no way the equivalent of saying a cube contains a line, area and volume.
  8. Yes, that only accounts for a little bit of the difference. It’s likely all the factors mentioned contribute. Several factors of 2 or 3 rather than one big one.
  9. Comparable, but also that’s by weight, so Na is ~ 2x more abundant by number.
  10. It’s 2,000,000 ppb for Na and 110,000 ppb for K, which might account for a large part of this https://en.m.wikipedia.org/wiki/Abundance_of_the_chemical_elements
  11. ! Moderator Note Material for discussion needs to be posted
  12. This thread is about the news article. If you want another conversation, open a new thread
  13. ! Moderator Note This is in Science News and was not moved
  14. swansont replied to Photon Guy's topic in Physics
    This is not owing to heat transfer - the radiation isn't thermal. It's doing work.
  15. If a point isn’t valid, you shouldn’t bring it up. But this is a science site. You should expect claims to be challenged. I can’t comment on things I don’t know about; if data are classified how could I? You don’t give any citations for claims, so they’re hard to follow up on. Your stance on gathering data is a self-fulfilling prophecy.
  16. It's the point you brought up that I was addressing. Now that you know it's false, I assume you won't claim it again. If there were other points, by all means discuss them.
  17. The notion that you could provide a picture of entanglement is ludicrous if you understand anything about entanglement. It’s not a request one can make in good faith. He “knew” what the best science at the time knew. Science is driven by data, not clairvoyance. The expansion of the universe wasn’t discovered until 1929
  18. That’s a hell of an interpretation. That it’s 100% wrong shouldn’t be surprising given the data. I accept science because of the evidence. We discussed this and your false dilemma suggests you did not absorb the concepts Yes, exactly. So why does the eyewitness testimony not count? I can’t fathom the confusion that would lead to this observation. Zero, I would say. Who was an “eyewitness” to this? Such is the way of religious zealotry, but I’m not sure what this has to do with science and scientific evidence. I’ve read the eyewitness testimony of others. No, because I have a degree in physics, so I know that “what powers entanglement?” is a crap question (nothing “powers” it, that phrasing suggests a complete lack of understanding of the underlying physics)
  19. This isn’t a legal issue, it’s science You’re suggesting that eyewitness testimony isn’t a thing in criminal prosecution, and nobody has been convicted because of it, which is an unserious argument.
  20. The data gets recorded, so it has not vanished, and since one describes how the experiment is done, others can replicate it. The Nobel committee wouldn’t worry about photons being destroyed. They aren’t stupid.
  21. Repeating fanciful stuff like this without any supporting documentation doesn’t exactly lend credibility to any claims you make. It’s likely one of those things that has a tiny grain of truth to it that kept getting modified with each retelling, like the ‘whisper’ game, until you end up with this claim. What’s telling is the credulous telling of it, just like the blind acceptance of other things. Skepticism is required here, and this doesn’t pass the sniff test. What’s much more likely, to me, is that this method appeared in a document that was classified, and remained classified for some time because it contained other information that still needed to be classified, or there is some other reason for not declassifying (like some statute that says you can’t declassify the document for 100 years) that has nothing to do with this specific item. If this were top secret, who broke federal law to point out that it’s classified? edit: The last time this came up I pointed out that the document was declassified in 2011. You should update your story. Further, it's probably this one https://www.cia.gov/readingroom/docs/CIA-RDP11X00001R000100010003-7.pdf Item 38. The document is confidential, not top secret. There are 50 items in it, and any one of the other 49 might be the reason the document was not declassified sooner. But saying that lemon-as-invisible-ink is classified is like saying "the" is classified because it appeared in a classified document.
  22. That's the problem of cooking something that's frozen. One section gets defrosted first and the heating gets much more efficient and cooks while the rest is still frozen.
  23. Plenty of non-scientists gather data that's useful (amateur astronomy, citizen science projects like bird counting.) It's not controlled conditions - these aren't done in a lab - it's the rigor of gathering the data e.g. instead of a random snapshot, it's multiple pics from different vantage points, with calibrated distances and background shots for reference. The problem with existing pictures is that there is almost no data you can get from them. The military data you don't have access to wasn't collected under controlled conditions, either. Again, "qualified by science" and who collects it isn't inherently the issue (unless you're a known charlatan)
  24. I will add to this that all of these methods transfer heat, from outside-in. Microwaves do not do this, as MigL and JCM have described. It’s not outside-in, but it is depositing energy to the interior, and somebody probably decided to describe that as inside out. Which it kinda-sorta is, but not necessarily center-out. The poor pop-sci description persists because zombie descriptions are hard to kill, when they are so easy to repeat.

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