Re: SR cannot determine Contraction

On Feb 24, 10:31 pm, Dono <sa...@xxxxxxxxxxx> wrote:
On Feb 24, 8:25 pm, PD <TheDraperFam...@xxxxxxxxx> wrote:





On Feb 24, 10:09 pm, Dono <sa...@xxxxxxxxxxx> wrote:

On Feb 24, 7:36 pm, "Artful" <art...@xxxxxxxxxx> wrote:

Nicely put.  Now we've just got to convince dono that an object *does*
'physically' have a shorter spatial length (ie take up less physical space;

I had a hunch that you will not get this. This is what happens when
you are more interested in being always right instead of getting it
right <shrug>

Let's put it this way. Length is a result obtained through a
prescription, one that typically involves recording two spatial
locations simulataneously. Length is a physical property. However,
because simultaneity is frame-dependent, the physical property length
is also frame-dependent. There is, however, no physical process or
interaction occurring to or in the rod to change its length.

PD

Correct.
-This is why one can't close the doors simultaneously in the barn
frame without hitting the pole.

In the frame in which the barn is at rest, you can.

-This is why the pole in the barn, being a thought experiment, is a
very poor illustration for length contraction.

I don't follow this.

-This is why, to date, we have no experimental test for length
contraction (http://www.edu-observatory.org/physics-faq/Relativity/SR/
experiments.html#Length_Contraction)

I don't follow that, either. What does the frame-dependence of length
do to prohibit measuring that effect, when the frame-dependence of
just about any other frame-dependent quantity has certainly been
measured? (E.g. muon lifetime in g-2, angular distributions of
secondary particles in hadron-hadron collisions, etc.)

PD
.

Relevant Pages

  • Re: SR cannot determine Contraction
    ... because simultaneity is frame-dependent, the physical property length ... In the frame in which the barn is at rest, ... This would be equivalent with a physical contraction ... current precision of measuring devices. ...
    (sci.physics.relativity)
  • Re: SR cannot determine Contraction
    ... Length is a physical property. ... because simultaneity is frame-dependent, the physical property length ... In the frame in which the barn is at rest, ...
    (sci.physics.relativity)
  • Re: Is "malfunctioning" absolute or relative?
    ... frame dependent or not. ... It results in a change in length, which is a physical quantity used to ... I said the quantity is frame-dependent, ... kinetic energy of the projectile from one ...
    (sci.physics.relativity)
  • Re: Is "malfunctioning" absolute or relative?
    ... kind of change in any physical quantity used to describe a rod, ... frame dependent or not. ... measurement. ... even though that quantiy is frame-dependent. ...
    (sci.physics.relativity)
  • Re: What is LET?
    ... and how it refuted the FitzGerald-Lorentz contraction. ... Yes, it happens in the lab frame, but it can't be measured there. ... way as the object you are measuring, ...
    (sci.physics.relativity)