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vf321 Group Title

Is information (in classical physics) transferred at light speed? Or is it assumed to be instantaneous? What is actually going on in examples such as: 1) An electron in space is surrounded by a capacitor which is connected to a closed circuit. Microsecond by microsecond, what happens? If I have two perfectly rigid boxes, one behind the other, and I push one on the side on a frictionless floor, when will the other box know it's being pushed?

  • 2 years ago
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  1. telltoamit Group Title
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    i think its instantaneous

    • 2 years ago
  2. vf321 Group Title
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    Assumed to be so or is?

    • 2 years ago
  3. telltoamit Group Title
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    thats what i think lol

    • 2 years ago
  4. 009infinity Group Title
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    yes the information is rtansferred at the speed of light

    • 2 years ago
  5. vf321 Group Title
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    really? So what would happen in the electron problem? The moment an atom of the metal in the switch touches the other side, the electron moves?

    • 2 years ago
  6. 009infinity Group Title
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    first tell which type of current is in the circuit ac or dc

    • 2 years ago
  7. vf321 Group Title
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    you have a battery (dc) of some EP hooked up to a switch and cap in series. an electron is in the space between the cap plates. You switch it on.

    • 2 years ago
  8. 009infinity Group Title
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    electron will move towards +ve terminal

    • 2 years ago
  9. 009infinity Group Title
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    instantaneous current will start flowing in circuit

    • 2 years ago
  10. vf321 Group Title
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    assuming it's a perfect switch of course

    • 2 years ago
  11. henpen Group Title
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    You need 'stuff' to transfer information. No thing (no 'stuff') can travel faster than light, so no. AT BEST, information (about ANYTHING) travels AT the speed of light, never above.

    • 2 years ago
  12. henpen Group Title
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    That was the relativistic answer. Qunatum mechanics muddies the waters considerably (google quantum entanglement).

    • 2 years ago
  13. 009infinity Group Title
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    is information ok

    • 2 years ago
  14. vf321 Group Title
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    yeah @henpen I heard about that

    • 2 years ago
  15. henpen Group Title
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    But rereading the question, as long as you aren't doing electromagnetism you can approximate that it does.

    • 2 years ago
  16. vf321 Group Title
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    eventually we'll have quantum computers with entangled memories - and finally no lag!

    • 2 years ago
  17. vf321 Group Title
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    OK. so the current has to reach the capacitor, as I understand it.

    • 2 years ago
  18. henpen Group Title
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    An good example is about 4 mins into http://www.youtube.com/watch?v=Yi1H_9JOwkI

    • 2 years ago
  19. vf321 Group Title
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    But what about the boxes example?

    • 2 years ago
  20. 009infinity Group Title
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    other box will start accelerating as soon as ist box starts motion

    • 2 years ago
  21. henpen Group Title
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    Are all your questions to do with the original information question?

    • 2 years ago
  22. henpen Group Title
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    As in, do we assume that information can't travel faster than for that question?

    • 2 years ago
  23. vf321 Group Title
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    @henpen I don't understand what you're saying. But I watched the video, and it seems to me that all forces can transfer their information at the speed of light (at most), since that information is transferred through the force's field particles (if I am not mistaken).

    • 2 years ago
  24. vf321 Group Title
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    Then only quantum entanglement is the instantaneous one. And I'm not going to pretend to know how that works.

    • 2 years ago
  25. henpen Group Title
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    Basically, it's impossible to have a totally rigid body. If you have light year long scissors (even really strong), if you close then quickly they will bend.

    • 2 years ago
  26. vf321 Group Title
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    okay then the stress/microscopic compressions in the first box will delay the force's movement across it by however much.

    • 2 years ago
  27. vf321 Group Title
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    But is my assumption about the light speed of forces true?

    • 2 years ago
  28. henpen Group Title
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    Yes and Yes.

    • 2 years ago
  29. vf321 Group Title
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    max speed of light speed*

    • 2 years ago
  30. vf321 Group Title
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    OK. Cool. that answers a lot, thanks!

    • 2 years ago
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