Time Dilation

[kamil]

Suppose there are 2 guys both standing on earth stationary to eachother. Its 1:00 on earth, one of the guys goes on a jet plane while the other stands on earth. There is a big clock on earth that shows the time(well enough for both guys to see). 1 hour later on earth, the earth-guy sees 2 o'clock and the jet-guy sees 1:58 due to time dilation. Now what would happen if the earth guy went into a jet plane and accalerated very quickly to the same speed as the original jet-guy, would the original earth guy see 2:00 or 1:58. According to SR the two guys are now at the same frame of reference, so they measure time the exact same way, so both would see 1:58. But that must mean that time has moved backward for the original earth-guy, but why should it? it didnt for the original jet-guy.

 

PS:if he saw the past than he would see himself hopping on the jet plane.

(Assume that the accelaration was almost instant ,like 0.99c/sec.

[Qfwfq]

1 hour later on earth, the earth-guy sees 2 o'clock and the jet-guy sees 1:58 due to time dilation.

If they look at the same clock, they read the same time.

[UncleAl]

http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/airtim.html

http://metrologyforum.tm.agilent.com/pdf/flying_clock_math.pdf

http://metrologyforum.tm.agilent.com/cesium.shtml

http://arxiv.org/abs/physics/0008012

Hafele-Keating Experiment

 

Read the paper and stop making a public spectacle of yourself,

 

http://fourmilab.to/etexts/einstein/specrel/specrel.pdf

 

http://www.geocities.com/physics_world/sr/ae_1905_error.htm

http://www.physics.gatech.edu/people/faculty/finkelstein/relativity.pdf

Longitudinal and transverse mass

 

Physics Today 58(3) 34 (2005)

Time passage, equator vs. poles

[Qfwfq]

Never mind UA's unkind remarks, Kamil.

 

The point is that a clock that journeyed on the jet will read 1:58 and the other one will read 2:00. Different proper times have elapsed for each of them.

[kamil]

Actually, no clock journied, it was just a big one that stayed on earth. By the way, everybody misinterpreted or forgot and important part of this question. THe puzling thing about this is that once the earth-guy goes on the jet plane he is in the same frame of refrence as the original jet-guy, so they should see the same time on the 1 big clock, but if that is so, that must mean that time has suddenly jumped backwards for the original earth-guy(1:58-2:00). But it didnt for the original jet-guy.

[Qfwfq]

The clock doesn't jump back. One clock gives one reading, for both guys.

[kamil]

The clock doesn't jump back. One clock gives one reading, for both guys.

 

either the two guys see the same time which must mean that the 1 big clock jumped back for the original-earth-guy's perspective. OR, the clock doesnt jump back and the two have different times. You cant have the clock not changing for one of them if they are to read the same time sice they see different times b4 the original earth guy hops on the plane.

 

Its like, you cant have a married bachelor.

[Qfwfq]

Its like, you cant have a married bachelor.

Which means that the same clock can't read two different times at the same time.

[kamil]

Which means that the same clock can't read two different times at the same time.

 

So if it does read the same time that means that it jumped back for the original earth guy, but it didn't for the original jet guy.

Remember that after 1 hour on earth the clock read 2:00to the original earth guy(call him A), but it read 1:58 for the original jet guy(call him :). So if 'A' quickly accalerates to the speed of

'B'(just say he somehow appears on B's jet) what time would he see. If he sees 2:00 that must mean he is seeing something different than 'B' but they are on the same jet. But if one argues that they are on the same jet so they should see the same time (1:58) then that must mean that it jumped back for 'A' ( from 2:00 to 1:58). But did it jump back 2 mintues foe 'B"when he was on his first voyage?

 

Do you understand now? Can you see the problem?

[danny8522003]

Wouldn't both the guys see the clock as 2:00?

 

The guy in the jet would just observe the hands of the clock speed up as he looked out the window, wouldnt he?

[kamil]

Wouldn't both the guys see the clock as 2:00?

 

The guy in the jet would just observe the hands of the clock speed up as he looked out the window, wouldnt he?

 

Time dilation would cause 'B'(original jet guy) to see 1:58. That is a clear example of time dilation.

[danny8522003]

If B had a clock on his person and was flying for 4mins (according to A) after starting at 1:56 and returned to Earth at 2:00 (according to A), that may read 1:58 because time slows down for B. The clock on the ground will still show that 4mins has passed for both A & B relative to the Earth, the only noticable dilation would on person 'A's clock which will show 1:58.

[EWright]

Why can't people just give a straight answer and stop the insanity? Here's your answer:

 

You are not including all variables in your situation, so you are confused. While there is only one clock on the earth that they both measure themselves against, there IS a clock on the plane whether you like it or not. IT HAS TIME. It is THIS clock that moves relative to the stationary clock on earth, which does not change from its normal rate of time. Now, an hour later, the wrist watch on the person traveling on the plane will read 1:58, while the one on earth reads 2:00 for both persons. It is the time for the person on the plane that SR says will be dialated because he is traveling at a higher rate of speed. There is nothing that will change the stationary earth clock's reading for either person. Thus, the traveling person and his watch will be two minutes younger than the earth person and earth clock, but will feel (and accurately by their measurements) that they only experienced 58 minutes as opposed to an hour.

[danny8522003]

Isn't that more or less what i said?

[EWright]

Isn't that more or less what i said?

 

I believe I was writing my post at the same time you were because I didn't see it before posting my own. But I like my version better! :)

 

:)

[danny8522003]

Well it's more detailed, so yea .. :)

[EWright]

I just noticed the distance in time stamps on our corresponding posts, but I should point out that I was using my wireless internet connection from my space ship while traveling at .35c for an hour or so while writing it.