Subject:
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Re: Relativity Question
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Wed, 8 Nov 2000 18:48:05 GMT
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Viewed:
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545 times
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In lugnet.off-topic.geek, Matthew Miller writes:
> Acceleration definitely plays into it. *All* clocks in non-accelerating
> motion relative to an observer run slow by his/her frame of reference. (Thus
> potentially causing arguments about what order things happened in.) But I
> still don't get what determines who is the inertial observer and who is the
> noninertial one.
Not quite sure what you mean by "inertial" and "noninertial," since as you
point out previously *everyone* is moving. However, within a local inertial
frame the Doppler shift of light can be identified to be of a particular
character (I don't have the equations handy). Someone accelerating out of
that inertial frame would experience additional doppler shift, by which we
can determine who is the mover relative to the frame. The stationary
observer will experience no such change to doppler shift.
Having said that, I anticipate a followup question will be "but who's to
say the whole inertial frame isn't accelerating away from the ship, and then
what happens to time dilation?" Hmm...
Dave!
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Message has 2 Replies:
 | | Re: Relativity Question
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| (...) However, some are moving in a certain way as to make it indistuigishable as to who is moving. i.e. me moving away from the universe is equivalent to universe moving away from me. (...) The equations are equivalent no matter what inertia frame (...) (24 years ago, 8-Nov-00, to lugnet.off-topic.geek)
| | | Re: Relativity Question
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| (...) Yeah, that's what I don't get, as well. The terms "inertial" and "noninertial" come from the britannica article, and they mean "non-accelerating motion" and "accelerating motion". But I'm not sure how to tell which is which without an absolute (...) (24 years ago, 8-Nov-00, to lugnet.off-topic.geek)
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Message is in Reply To:
| | Re: Relativity Question
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| Just looked this up in Britannica Online. (Search for "time dilation"). Acceleration definitely plays into it. *All* clocks in non-accelerating motion relative to an observer run slow by his/her frame of reference. (Thus potentially causing (...) (24 years ago, 8-Nov-00, to lugnet.off-topic.geek)
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