Re: Is there Time Dilation if Twins circle the Earth at 1/3c??

From: Jesse Mazer (vze2ztqw_at_mail.verizon.net)
Date: 02/11/05 

Date: Fri, 11 Feb 2005 23:21:01 GMT

guskz@hotmail.com wrote:

>Strange Phenomena question?
>
>1. Question:
>
>The further the twin distances himself in a straight line from Earth
>(1/3c) then just as the twin turns around (-1/3c), if the Earth then
>also travels at 1/3c to meet him *HALF-WAY* then both their clocks will
>be the same again? Correct?
>

Yes.

>
>2. I believe from the circular magnetic accelerators machines that if
>the Twin instead of a straight line travel, spun around the Earth at
>1/3c then he would also exhibit a time dilation (will be younger)?
>

Yup.

>
>------------------------------------------------------------------
>
>But then if any remember the twin pairs model I gave then who once
>again would age less....since THIS TIME there is NO Lost distance to
>recover to compare CLOCKS (meaning neither will need to travel long
>distance and dilate time further before compairing clocks) ???
>
>Therefore since the twin does not need to return to compare clocks...he
>just stops his velocity and then can immediately compare clocks?
>

Are you still talking about a twin talking in a circle? If so, yes, they
can compare clocks when the twin circles around once.

>
>---------------------------------------
>Repeat of model:
>
>1. Two twin pairs on small platform, one pair travels at 1/3c not
>straight but this time in circles around plaform.
>
>So know the pair that are spinning at 1/3c are aging less.
>
>2. Then one of each pair travels to meet other pair:
>
>Meaning one that is spinning stops spinning and one on the plaform
>starts to spin at 1/3c.
>
>(Can two same size bodies in space determine WHO is spinning around
>who???? With absolutely nothing else around them?)
>
>
>If they really can't tell who is spinning around who (then either
>perspecitve can be an inertial reference frame)
>

No, spinning is absolute in SR, since it is a form of
acceleration--acceleration means either change in speed *or* change in
direction (a twin spinning around can tell he's spinning because he'll
feel a centrifugal force while his non-spinning brother won't).

Jesse

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