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 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?
 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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telltoamit
 2 years ago
Best ResponseYou've already chosen the best response.0i think its instantaneous

telltoamit
 2 years ago
Best ResponseYou've already chosen the best response.0thats what i think lol

009infinity
 2 years ago
Best ResponseYou've already chosen the best response.0yes the information is rtansferred at the speed of light

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0really? 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?

009infinity
 2 years ago
Best ResponseYou've already chosen the best response.0first tell which type of current is in the circuit ac or dc

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0you 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.

009infinity
 2 years ago
Best ResponseYou've already chosen the best response.0electron will move towards +ve terminal

009infinity
 2 years ago
Best ResponseYou've already chosen the best response.0instantaneous current will start flowing in circuit

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0assuming it's a perfect switch of course

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1You 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.

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1That was the relativistic answer. Qunatum mechanics muddies the waters considerably (google quantum entanglement).

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0yeah @henpen I heard about that

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1But rereading the question, as long as you aren't doing electromagnetism you can approximate that it does.

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0eventually we'll have quantum computers with entangled memories  and finally no lag!

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0OK. so the current has to reach the capacitor, as I understand it.

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1An good example is about 4 mins into http://www.youtube.com/watch?v=Yi1H_9JOwkI

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0But what about the boxes example?

009infinity
 2 years ago
Best ResponseYou've already chosen the best response.0other box will start accelerating as soon as ist box starts motion

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1Are all your questions to do with the original information question?

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1As in, do we assume that information can't travel faster than for that question?

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0@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).

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0Then only quantum entanglement is the instantaneous one. And I'm not going to pretend to know how that works.

henpen
 2 years ago
Best ResponseYou've already chosen the best response.1Basically, 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.

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0okay then the stress/microscopic compressions in the first box will delay the force's movement across it by however much.

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0But is my assumption about the light speed of forces true?

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0max speed of light speed*

vf321
 2 years ago
Best ResponseYou've already chosen the best response.0OK. Cool. that answers a lot, thanks!
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