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swansont

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Everything posted by swansont

  1. 1. Yes. If the upper limit is a constant this is trivial, since it will be a rectangle. 2. You should stop using a language model that makes stuff up to get factual information
  2. It’s used to light up “exit” signs where electricity isn’t readily available. https://www.nrc.gov/reading-rm/doc-collections/fact-sheets/fs-tritium.html Long-term storage is problematic since it decays away (12.3 year half-life)
  3. Right. It works best on polar molecules, like water.
  4. The cap only applies to G7 countries. If some other nation transports the oil, there is no effect. It seems likely that non-G7 ships have taken up the transport of oil. Edit: https://www.hellenicshippingnews.com/sanctions-on-russian-crude-and-diesel-exports-are-failing/ “Mainstream European tanker owners have largely abandoned the Russian trade now that the country’s crude and diesel have breached Western price caps. The so-called “shadow” fleet — tankers operating outside Western insurance and financial circles — has taken over”
  5. The energy is absorbed by anything in the oven, with varying efficiencies (oil would likely have a low efficiency). It can get things hotter than 100 C, just not liquid water. Ceramics and glass don’t have water in them either, but they heat up. You can melt plastic.
  6. swansont replied to M.Ross's topic in Relativity
    Both. As the saying goes, relativity, causality, FTL: pick two. You can have causality and FTL if you discard relativity, but relativity is consistent with experiment.
  7. swansont replied to M.Ross's topic in Relativity
    Because it’s unphysical
  8. swansont replied to M.Ross's topic in Relativity
    But that just begs the question - how does the observer move that fast?
  9. Not me. Keeping the heat up a bit sets up a nice convection cell and mixes the pasta, as Ken notes. Helps make sure it doesn’t stick to the bottom of the pot, or stick together
  10. They are not involved in dealing out the neg rep in question.
  11. The title does say spatial dimensions…
  12. ! Moderator Note The international language of science is English
  13. Fair enough
  14. What is the marker? A line is not a physical object.
  15. The trash bin is for topics that are also rules violation of some sort. Not for failed proposals.
  16. You’d have to have something in the space to be able to observe behavior in order to tell.
  17. PE is not only for gravity. Any conservative force will work, i.e. there is no dissipative force, such as friction. Electrostatic forces and springs are two prominent examples
  18. The conversion of PE to KE (or vice-versa) depends on the internal force that’s present. An object under constant acceleration will convert at a different rate than acceleration from an inverse-square relation. You should be able to solve for KE or PE as a function of time, for whatever circumstance you have
  19. It’s the slope of the function, y = f(x)
  20. Safety note: these green lasers can “bleed” a lot of IR if there is no IR filter and can be an eye danger since your eyes don’t have a blink reflex for the IR, and there’s a lot of IR power relative to the green light. https://www.technologyreview.com/2010/08/12/121205/the-danger-of-green-laser-pointers/
  21. This is moot, since fusion does not deal with significant amounts of bulk material. It also depends on the material and wavelength. Some materials are quite transparent at certain laser wavelengths. Fiber optics depends on this But you don’t want the EM radiation to penetrate, you want it to exert pressure. “NIF does this by amplifying and focusing 192 laser beams onto a tiny hollow metal cylinder at the centre of which is a peppercorn-sized capsule containing the hydrogen isotopes deuterium and tritium. X-rays generated from the walls of the cylinder blast off the outer surface of the capsule, forcing the rest of it inwards thanks to momentum conservation and causing the deuterium and tritium nuclei within it to fuse – in the process releasing alpha particles (helium nuclei), neutrons and lots of energy.”
  22. It may be difficult to tie a single event to climate change, much like you can’t tell for sure that seatbelts saved a life in certain accidents. But it becomes clearer when you look at the statistics of all the events.
  23. It’s the gravitational potential - the height change is the major contributor, not the change in g - and atomic clocks don’t rely on radioactive decay.
  24. Yup. Yeah, right. Making stuff up? Accuse others of what you’re doing? That’s the Trump playbook.
  25. Growth rate has been slowing for decades https://www.statista.com/chart/28744/world-population-growth-timeline-and-forecast/

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