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What is time?
An Intelligent Horse
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Posted 11/27/08 - 07:26 PM:
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#421
There are a lot of very basic problems with the question. I don't want to sound rude or condescending, but its hard when there have not only been numerous posts on the subject but "Ronjanec" refuses to cite any physicist that believes in something totally opposite of such a fundamentally sound issue. I mean god, Einstein, one of the most famous scientists of all-time, dealt and defined a lot of our understanding in theoretical physics. He answered this question several times, but I digress. I'll address each question individually.

ronjanec wrote:
Kwalish Kid: I have read this comment in a book by a physicist and no I can't remember the name of the book at this time.

I would really love a citation because any educated scientist clearly knows that your proposed statement is wrong.

ronjanec wrote:
If you are implying that I am wrong about this belief then why does every physicist I know of also believe "time slowed down" because one of the atomic clocks slowed down in the famous experiment?

Why do you say 'in the famous experiment' and yet you have never referenced any experiment whatsoever. Guessing, I think you are talking about Einstein's experiment to prove his theory of relativity using atomic clocks traveling on jets that were traveling at just above the speed of sound (767 mph.) It proved Einstein's theory (one of them) that time is not constant and can change depending on how fast the subject being timed is moving. The experiment showed that time "sped" up on the jet -- that is, there was less time elapsed on the atomic clock on the jet than the one on the runway which was used as the "control" in that experiment. If you need me to clarify I will, but I think you can get the basic jist of it.
An atomic clock is simply a way to measure time. If an atomic clock slows down, it doesn't cause time to slow down -- it shows that time has already slowed down. A simple way to explain it would be cause and effect. The cause is time slowing down, the effect is that the atomic clock slows down as well.
One last thing: no matter how fast time is actually moving, for a person experiencing it, it will always feel the same. The only way they would know its different from any other period of time passing is if they stood outside the "aura" of the period and looked in. NOTE: The person looking in would have to be experiencing time at a different pace to know it was any differrent. This can illustrated with a very effective example. Say there is one person on a train and one person on the train platform. Technically, as proved in Einstein's plane experiment, the person on the train's time is actually moving slightly faster than the person on the train platform (nothing too extraordinary, maybe a millionth of a second faster.) The person on the train platform looks at the person on the passing train and sees the trian zip by chugging along at 70 mph. They conclude the traingoer is experiencing time at a much faster rate, even though to the person on the train, everything seems normal time-wise.
In conclusion, this is a widely accepted/known idea, and I'm wondering how you could get the whole clock causes time idea and what physicist could have instilled such a preposterous thought in your head (I'm guessing you made up a physicist that believes this so you don't look stupid, especially because you can't cite one as addressed earlier.) I'm also wondering if this was a question on a homework assignment, because it sounds like a question they might ask. Anyways, hope I answered your question.

jorndoe
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Posted 11/27/08 - 08:49 PM:
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#422
Just a quick comment..

An Intelligent Horse (#421) wrote:
no matter how fast time is actually moving
[..]
have to be experiencing time at a different pace to know it was any differrent
[..]
the train's time is actually moving slightly faster than the person on the train platform
[..]
They conclude the traingoer is experiencing time at a much faster rate

I always get suspicious when qualities/properties of time is defined in terms of time (itself?), though it may just be a language kinda' thing.
Example snippets in this one post (which certainly is not the only one):
 â€¢ time is moving (fast) — but motion/speed is itself defined in terms of time
 â€¢ different pace of time — but, similar to motion/speed, pace itself depends on time
 â€¢ time is moving slightly faster — see previous items
 â€¢ time is experienced at a faster rate — see previous items
The full consequence of time itself moving, to me, seems to imply another, different time, allowing the "original" to move.

As far as relativity goes, the differing spacetime measurements, however, does not seem to imply more than one (the original) time (as far as I can tell).
Rather, the relative "disparity" (e.g. Lorentz factor), is entirely dependent on the two selected perspectives (the observer's inertial system and the observed).

Perhaps the confusion is due to the constant change, that we conceptualize through the temporal "now".
(Which, it seems, is not so constant after all, as per relativity.)

I do not agree with ronjanec, that because time is not an object (or material or somesuch), it hence does not exist.
This article seems to suggest the opposite, somewhat:
http://www.newscientist.com/articl...y-vacuum-fluctuations.html

Ok, I'll stop my pedantics now. smiling face

People are to themselves what they think; people are to others what they do.
 ∞
 ∑ 1/i² =  π²/6
i=1

Benkei
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Posted 11/28/08 - 12:33 AM:
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#423
Perhaps the confusion is due to the constant change, that we conceptualize through the temporal "now".


"Now" is meaningless in relativity unless people share the same reference frame. nod

Obama is humping the pump in an effort to re-inflate an economy that looks more like a balloon with a 55 caliber bullet hole in it. - Joe Bageant
Foxpriest, then...
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Posted 11/29/08 - 05:56 AM:
quote post
#424
jorndoe wrote:
Just a quick comment..


I always get suspicious when qualities/properties of time is defined in terms of time (itself?), though it may just be a language kinda' thing.
Example snippets in this one post (which certainly is not the only one):
 • time is moving (fast) — but motion/speed is itself defined in terms of time
 • different pace of time — but, similar to motion/speed, pace itself depends on time
 • time is moving slightly faster — see previous items
 • time is experienced at a faster rate — see previous items
The full consequence of time itself moving, to me, seems to imply another, different time, allowing the "original" to move.



Is this another word problem? When we speak of time moving, we obviously don't mean traveling through space. This is the "movement" of time forward.
ronjanec
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Posted 11/29/08 - 06:35 AM:
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#425
An Intelligent Horse wrote:
There are a lot of very basic problems with the question. I don't want to sound rude or condescending, but its hard when there have not only been numerous posts on the subject but "Ronjanec" refuses to cite any physicist that believes in something totally opposite of such a fundamentally sound issue. I mean god, Einstein, one of the most famous scientists of all-time, dealt and defined a lot of our understanding in theoretical physics. He answered this question several times, but I digress. I'll address each question individually.


I would really love a citation because any educated scientist clearly knows that your proposed statement is wrong.


Why do you say 'in the famous experiment' and yet you have never referenced any experiment whatsoever. Guessing, I think you are talking about Einstein's experiment to prove his theory of relativity using atomic clocks traveling on jets that were traveling at just above the speed of sound (767 mph.) It proved Einstein's theory (one of them) that time is not constant and can change depending on how fast the subject being timed is moving. The experiment showed that time "sped" up on the jet -- that is, there was less time elapsed on the atomic clock on the jet than the one on the runway which was used as the "control" in that experiment. If you need me to clarify I will, but I think you can get the basic jist of it.
An atomic clock is simply a way to measure time. If an atomic clock slows down, it doesn't cause time to slow down -- it shows that time has already slowed down. A simple way to explain it would be cause and effect. The cause is time slowing down, the effect is that the atomic clock slows down as well.
One last thing: no matter how fast time is actually moving, for a person experiencing it, it will always feel the same. The only way they would know its different from any other period of time passing is if they stood outside the "aura" of the period and looked in. NOTE: The person looking in would have to be experiencing time at a different pace to know it was any differrent. This can illustrated with a very effective example. Say there is one person on a train and one person on the train platform. Technically, as proved in Einstein's plane experiment, the person on the train's time is actually moving slightly faster than the person on the train platform (nothing too extraordinary, maybe a millionth of a second faster.) The person on the train platform looks at the person on the passing train and sees the trian zip by chugging along at 70 mph. They conclude the traingoer is experiencing time at a much faster rate, even though to the person on the train, everything seems normal time-wise.
In conclusion, this is a widely accepted/known idea, and I'm wondering how you could get the whole clock causes time idea and what physicist could have instilled such a preposterous thought in your head (I'm guessing you made up a physicist that believes this so you don't look stupid, especially because you can't cite one as addressed earlier.) I'm also wondering if this was a question on a homework assignment, because it sounds like a question they might ask. Anyways, hope I answered your question.



"Time is the movement of a clock" Again I would not say Einstein said this if I did not read this somewhere and I really wish I could prove this to everyone. Other physicists on other forums (Cosmic Log for one) were aware of this quote and I am really surprised that no one on this forum knows this.
Benkei
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Posted 11/29/08 - 06:43 AM:
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#426
Obviously, considering the body of work Einstein has produced you have completely misinterpreted that sentence or otherwise adhere far too much importance to it when taking Einstein's actual position on it. This position ought to be clear to you if you actually read his works.

Obama is humping the pump in an effort to re-inflate an economy that looks more like a balloon with a 55 caliber bullet hole in it. - Joe Bageant
jorndoe
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Posted 11/29/08 - 07:01 AM:
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#427
Foxpriest, then... (#424) wrote:
Is this another word problem? When we speak of time moving, we obviously don't mean traveling through space. This is the "movement" of time forward.

Well, no, that's not what I meant exactly.

The notions of motion and speed are defined in terms of time and space.
In other words, motion is meaningless without having presupposed time.

So, if you speak of time moving, it just seems like you're redefining what is meant by motion, or making a circular statement, or presupposing "another time" (different from the "original").
For example, would this movement of time hence be measurable in seconds per second?

People are to themselves what they think; people are to others what they do.
 ∞
 ∑ 1/i² =  π²/6
i=1

ronjanec
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Posted 11/29/08 - 07:32 AM:
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#428
Benkei wrote:
Obviously, considering the body of work Einstein has produced you have completely misinterpreted that sentence or otherwise adhere far too much importance to it when taking Einstein's actual position on it. This position ought to be clear to you if you actually read his works.


So someone is finally admitting he did say this?
Kwalish Kid
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Posted 11/29/08 - 08:25 AM:
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#429
ON THE ELECTRODYNAMICS
OF MOVING BODIES
By A. Einstein
June 30, 1905

http://www.fourmilab.ch/etexts/einstein/specrel/www/

Einstein wrote:
If we wish to describe the motion of a material point, we give the values of its co-ordinates as functions of the time. Now we must bear carefully in mind that a mathematical description of this kind has no physical meaning unless we are quite clear as to what we understand by "time." We have to take into account that all our judgments in which time plays a part are always judgments of simultaneous events. If, for instance, I say, "That train arrives here at 7 o'clock," I mean something like this: "The pointing of the small hand of my watch to 7 and the arrival of the train are simultaneous events."

It might appear possible to overcome all the difficulties attending the definition of "time" by substituting "the position of the small hand of my watch" for "time." And in fact such a definition is satisfactory when we are concerned with defining a time exclusively for the place where the watch is located; but it is no longer satisfactory when we have to connect in time series of events occurring at different places, or--what comes to the same thing--to evaluate the times of events occurring at places remote from the watch.

We might, of course, content ourselves with time values determined by an observer stationed together with the watch at the origin of the co-ordinates, and co-ordinating the corresponding positions of the hands with light signals, given out by every event to be timed, and reaching him through empty space. But this co-ordination has the disadvantage that it is not independent of the standpoint of the observer with the watch or clock, as we know from experience. We arrive at a much more practical determination along the following line of thought.

Pages follow this where Einstein elaborates this "much more practical determination" and its consequences.

Therefore, Einstein was not satisfied with merely saying time is a matter of simply watching a clock.

"I don't mind if Christians honor the moment by displaying, and singing about, reindeer (a hard species to find in the greater Jerusalem/Bethlehem area). Same for the pine trees that also don't grow in Palestine. I wish everybody joy of it." - Christopher Hitchens
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Posted 11/29/08 - 09:43 AM:
Subject: What is time
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#430
I am just a song writer and spend most of my "time" thinking about life & thought i would offer my humble opinion.
Are you seeking a definition for time or discussing how it is measured?
The movement of a clock is a way used to measure time but it is not the essence there of. To me time is the duration from future to past, a temporal continuum. Is time defined by what is used to measure it?
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