Re: Spaceship Question


"Randy Poe" <poespam-trap@xxxxxxxxx> wrote in message
news:1138910615.886810.143630@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Henri Wilson wrote:
On 1 Feb 2006 18:20:36 -0800, "Randy Poe" <poespam-trap@xxxxxxxxx>
wrote:


Henri Wilson wrote:
On Wed, 01 Feb 2006 15:32:42 +0100, "Paul B. Andersen"
<paul.b.andersen@xxxxxxxxxxxxxxxx> wrote:
If I am to measure the length of a _moving_ rod,
I can obviously not run after it with my tape.

Then get in your car and chase it.
When level, check its length with your tape.

If you change reference frames so that the rod is now at rest
in your rest frame, we do not call that a "moving rod".

That's very observant of you.
Do you think its length is affected by the fact that you have caught up
with
it?

Yes. Length is frame-dependent

NO.....light path of length of a rod is frame-dependent.




.

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    (sci.physics.relativity)
  • Re: Spaceship Question
    ... I can obviously not run after it with my tape. ... If you change reference frames so that the rod is now at rest ... in your rest frame, we do not call that a "moving rod". ...
    (sci.physics.relativity)