Re: Spaceship Question


Henri Wilson wrote:
On 15 Feb 2006 08:45:55 -0800, "PD" <TheDraperFamily@xxxxxxxxx> wrote:


Henri Wilson wrote:
On 14 Feb 2006 14:33:25 -0800, "Randy Poe" <poespam-trap@xxxxxxxxx> wrote:



Nothing happens to the *proper* length. Everybody agrees
that length is affected by motion, since "length" is
different from "length measured in the rest frame".

Very useful quantity is this 'proper length'. I wonder what it really means.

Ah, Henri -- all this is new to you, I see. Wonderful hubris on your
part, to critique something before you are familiar with it. (I've seen
some school board members who "know" that some books are not
appropriate for their children, though they admit they've never read
those books and don't intend to either.)

I know what SRians mean by proper length

I doubt it.

..and I know what real purpose it
serves. It acts as an apparent escape route for them...Trouble is, we can see
through it.

'Proper length' is nothing but the absolute 'spatial interval' between the two
ends.

As measured in the rest frame.

It doesn't vary with velocity and never did.

The velocity in the rest frame is always 0.

1. Define "length" strictly to mean only the value that is measured at
rest. In this case, the laws of physics have to be different in all
inertial reference frames.

What are you talking about.
You can take your standard rod anywhere and it hasn't changed one iota.

That's right. All positions in the rest frame are equally at
rest. If the rod is 10 miles away, but at rest, its length is
equal to its proper length.

However, being in relative motion is not a "somewhere".
A rod which is RIGHT HERE but not at rest will have
a length different from its proper length.

- Randy

.

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