Recent content by Andreas C

  1. Andreas C

    B If you had to make a perfect vacuum, version #2

    Do you know what the density of antiprotons is in there?
  2. Andreas C

    B If you had to make a perfect vacuum, version #2

    Oh good! I certainly did not expect a vacuum so close to perfect to have already been obtained, that really changed my perspective.
  3. Andreas C

    B If you had to make a perfect vacuum, version #2

    I'm not sure if it is what you're looking for, but it seems to refer to p. 24 of this: http://cds.cern.ch/record/2120817/files/SPSC-SR-177.pdf It just mentions that the storage time is more than 1.08 years.
  4. Andreas C

    I What does it take to spaghettify?

    Apparently it is right. I put this crazy thing in an online expression simplifier (it would take a while to do it by hand): ##ρGM(r+l-d)(\frac{1}{r^2+rl}-\frac{1}{d^2+d(r+l-d)})+ρGM(d-r)(\frac{1}{r^2+rl}-\frac{1}{r^2+r(d-r)})## and it gave me 0, which means that...
  5. Andreas C

    B If you had to make a perfect vacuum, version #2

    That's amazing! How long was this maintained? So that sorts outgassing. How did they manage to evacuate the chamber so well?
  6. Andreas C

    I What does it take to spaghettify?

    Ok I think I've got it this time: starting from the bottom, I find the acceleration of the piece of strand from O to l (which is smaller than the acceleration of the strand as a whole), I subtract it from the acceleration of the entire strand, and I multiply it by the mass of the upper piece of...
  7. Andreas C

    B If you had to make a perfect vacuum, version #2

    Yes, it's very interesting. I just joked about using a perfect vacuum to test a model that was proposed there.
  8. Andreas C

    B If you had to make a perfect vacuum, version #2

    Are you telling me that performing an experiment involving sucking noodles with the utmost precision has no practical application? What are you going to say next, that it's useless to think of how many angels can dance on the head of a pin? :biggrin:
  9. Andreas C

    B If you had to make a perfect vacuum, version #2

    ...oh... I feel a bit awkward now... Let's assume we have a detector that can always detect an atom if it's there, and does not cause issues like polluting it with more atoms. And let's call "very long" something "easy" at first, 100 seconds. It's all relative, and that's why I said less...
  10. Andreas C

    B If you had to make a perfect vacuum, version #2

    It's a 'joke", an expression, don't take it literally. Well, someone mentioned deep space. Out there you'd find less than an atom per cc. I'm not sure exactly how many there are in interstellar space, because sources seem to say from 1 atom per cubic meter to 1 atom per cc. Theoretically you...
  11. Andreas C

    B If you had to make a perfect vacuum, version #2

    Theoretically impossible? No, there are tons of it everywhere.
  12. Andreas C

    B If you had to make a perfect vacuum, version #2

    Some of those are also theoretically impossible, a perfect vacuum isn't.
  13. Andreas C

    I What does it take to spaghettify?

    Oh wait, there' Ah ok, that makes sense. So I don't have to add them, I can just evaluate the force with which that segment is pulling the other upwards or downwards.
  14. Andreas C

    I What does it take to spaghettify?

    2000 Newtons.
  15. Andreas C

    Vacuum or pressure to move spaghetti through a hole

    Ooooh silicone! It's not really as flacud as noodles, but it doesn't sound bad.
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