Re: So... Lerentz Contractions are *physical* not observered?

"kenseto" <kenseto@xxxxxxxxxx> wrote in message
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"jem" <xxx@xxxxxxx> wrote in message
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kenseto wrote:
"jem" <xxx@xxxxxxx> wrote in message
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kenseto wrote:


"Tom Roberts" <tjroberts137@xxxxxxxxxxxxx> wrote in message
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mgconsolidated@xxxxxxxxxxxxxx wrote:


Can anyone provide / point to a definitive answer on whether Lorentz
contractions are physical or an observered effect.

This depends on what you mean by those words.

Here's an analogy: a ladder will fit through a doorway if it is
oriented
correctly, and won't fit if it is oriented differently -- is this
difference "physical"? -- after all neither the length of the ladder
nor
the width of the doorway change in any way. This is an example of
GEOMETRICAL PROJECTION -- if the projection of the ladder's length
onto
the doorway's width is small then it fits, and if that projection is
large then it won't; this depends on their relative orientation.


Instead of the ladder we have a circular metal plate with a diameter
of

Dp

and the door in the barn is also circular with a diameter of Db. Dp is

lager

than Db. Now Dp is accelerated to a relativistic speed will it fit

through

the smaller Db door???

Does IRT have an answer, Seto?


Yes IRT has an answer as follows:
Dp will not fit through the smaller Db door.
Why?
In IRT the physical length of an object remains the same in all frames
of
reference.... even as viewed by different observers. In IRT the light
path
length of an object is different in different frames. The higher is the
state of absolute motion of an object the longer is it's light path
length.
An IRT observer does not know if the rod moving wrt him is in a higher
or
lower state of absolute motion. That's why IRT has two sets of
equations
for
the light path length of a moving rod. When the moving rod is in a
higher
state of absolute motion than the IRT observer then its light path
length is
longer than the light path length of the IRT observer's rod by a factor
of
(gamma). When the moving rod is in a lower state of absolute motion
than
the
IRT observer then its light path length is shorter than the light path
length of the IRT observer's rod by a factor of (1/gamma).....BTW this
is
the formula for the SR length contraction.

Same for SR, Seto. Except for the "Why?" part, of course. :)

No its not the same for SR. SR says that a rod is able to fit through the
door way because of rotation of the rod.

In space time .. yes

With my example how is SR able to
explain that the circular plate is able to fit through the door way when
rotation will not do the trick?

WTF are you on about?

IRT definitely says that the larger
circular plate will not be able to fit through the smaller door way no
matter what speed it is moving..

I think you need to describe the orientation of the plate and the door and
the motion of the plate

You seem very confused again, Ken.



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