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tech / alt.astronomy / the twin paradox

SubjectAuthor
* the twin paradoxMrPostingRobot
`- Re: the twin paradoxR Kym Horsell

1
Subject: the twin paradox
From: MrPostin...@kymhorsell.com
Newsgroups: alt.astronomy
Organization: Aioe.org NNTP Server
Date: Mon, 16 May 2022 07:35 UTC
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From: MrPostin...@kymhorsell.com
Newsgroups: alt.astronomy
Subject: the twin paradox
Date: Mon, 16 May 2022 17:35:16 +1000
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Hillbillies bang on about relativity all the time. But it turns out
they dont really understand the first thing about it.

Here's a problem to gits yo on yor way to passing Physics 101.

It's the future. There are 2 twins aged 30.
One of them is in the Space Force and takes off in a cruiser to
a star 10 light years distant. She stays there for a year
trying to find some Earthlings that were kidnapped back in the 20th century.
Then she comes home.

But big surprise! Her twin is now 40 and she is only 32.

How fast was the space cruiser?  And relative to what?


--
"Nothing in life is to be feared, it is only to be understood.
Now is the time to understand more, so that we may fear less."
- Marie Curie

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Subject: Re: the twin paradox
From: R Kym Horsell
Newsgroups: alt.astronomy
Organization: kymhorsell.com
Date: Mon, 16 May 2022 09:17 UTC
References: 1
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From: kym...@kymhorsell.com (R Kym Horsell)
Newsgroups: alt.astronomy
Subject: Re: the twin paradox
Date: Mon, 16 May 2022 09:17:51 -0000 (UTC)
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MrPostingRobot@kymhorsell.com wrote:
Hillbillies bang on about relativity all the time. But it turns out
they dont really understand the first thing about it.
Here's a problem to gits yo on yor way to passing Physics 101.
It's the future. There are 2 twins aged 30.
One of them is in the Space Force and takes off in a cruiser to
a star 10 light years distant. She stays there for a year
trying to find some Earthlings that were kidnapped back in the 20th century.
Then she comes home.
But big surprise! Her twin is now 40 and she is only 32.
How fast was the space cruiser?  And relative to what?


Well I'm not really expecting the group dimwits to be able to solve this
basic problem. They're apparently paid to intercept postings about UFO's
and they dont need highschool fer that. :)

If the twins hadnt gone to college the one that went on the trip might
calculate she had spent 1y travelling over 10 ly therefore she travelled
at 10x the speed of light.

The one that stayed at home might calculate his twin had travelled 10 ly
in 10y and therefore travelled at the speed of light.

If they did that, they would be wrong.

Relativity based on certain assumptions about the propagation of
information in a certain type of space predictions measurments of
time, mass, and length will be affected by the relative motions and
positions of the observers.

Ostensibly there's a factor of 10x between the travel times observed
by the twins in their own frame of reference. In relativity
so-called "time dialations" are calculated using the magic factor
1/sqrt(1-(v/c)^2) where v is the (let's suppose) constant relative
speed of the 2 frames and c is the speed of light.

So if the time dialation factor is 10 then the speed v is
sqrt(1- (1/10)^2) == .994 in this case.

I.e. if the travelling twin moved at .994 c for the 10 ly of the trip
they would cover the 10 ly in 1 y as far as they were concerned.
Because to them the distance was "red shifted" by a factor of 10
and the 10 ly was actually only 1 ly.

Moral: speed = velicity by time is for kindergarten and anyone seriously
claiming it is some kind of obvious truth apparently didnt do any serious
physics past grade school.



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