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vf321

  • 2 years ago

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?

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  1. telltoamit
    • 2 years ago
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    i think its instantaneous

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

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

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

  5. vf321
    • 2 years ago
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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?

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

  7. vf321
    • 2 years ago
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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.

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

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

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

  11. henpen
    • 2 years ago
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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.

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

  13. 009infinity
    • 2 years ago
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    is information ok

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

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

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

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

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

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

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

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

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

  23. vf321
    • 2 years ago
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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).

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

  25. henpen
    • 2 years ago
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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.

  26. vf321
    • 2 years ago
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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.

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

  28. henpen
    • 2 years ago
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    Yes and Yes.

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

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

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