Re: SR cannot determine Contraction

On Feb 26, 10:55 am, dlzc <dl...@xxxxxxx> wrote:
 Dear Dono:

On Feb 26, 7:27 am, Dono <sa...@xxxxxxxxxxx> wrote:





On Feb 26, 5:10 am, "N:dlzcD:aol T:com \(dlzc\)" <dl...@xxxxxxx>
wrote:

What is "real" is what is measured.  A Lorentz aetherist
has the rod "really" shrink, while a relativist has
perspective on 4D spacetime and the rod "appears" shorter.
 Either "school", the pole fits inside the barn... if you
are at rest with the barn.

OK, please answer this (neither Tom , nor Paul have
answered it yet):

Assume the following description of the pole in the barn
paradox:
-The  pole is 50 feet long and a barn is 30 feet.
-What would happen if you closed both barn doors
simultaneously (in the barn frame) after  1 foot of the
pole made it all the way to the other
side of the barn, thru the exit door.
-Assume that the pole is moving at .8c and that the door
closure takes 10^-21 seconds.

Your description of the barn and the pole at the instant of closing is
unclear.

-Will the entry door clip the pole or not? (It is
obvious that the exit door hits the pole but this is
not interesting).

I can take a picture from either door, that shows the pole in the
barn, and no shadow from either / both end(s) of the pole on the
ground.  With enough money, and no photo editing.

David A. Smith- Hide quoted text -

- Show quoted text -

Thank you :-)
Paul and I are way past this subject. Maybe next time :-)
.

Relevant Pages

  • Re: SR cannot determine Contraction
    ... One can easily construct a scenario in which the doors never touch the pole, and so cannot possibly induce any stress in the pole. ... Make the barn 30 feet long and the pole 50 feet long, but have it move at 0.99 c relative to the barn. ... Start with the exit door closed and the entrance door open. ...
    (sci.physics.relativity)
  • Re: SR cannot determine Contraction
    ... And he is the 'authority' as to whether the pole fit within the barn. ... side of the barn, thru the exit door. ... middle of the barn' signals it to open. ...
    (sci.physics.relativity)
  • Re: space: gravitys effect on time and expansion?
    ... they teach how relativity is supposed to contract a rod as it gets ... Doesn't work as a way to get a longer rod inside the barn with both ... but in the original pole and barn experiment you are unable to have ...
    (sci.physics.relativity)
  • Re: SR cannot determine Contraction
    ... the barn doors are left open and the pole pasees thru the barn. ... No acceleration, no forces, no collisions. ... Assume that the pole is moving at .8c and that the door closure ...
    (sci.physics.relativity)
  • Re: SR cannot determine Contraction
    ... the rod and the coordinate system used to measure its length. ... measures its proper length) and the barn frame (which measures a shorter ... contract to 22.36m and the pole to 29.81. ... This is not the barn-pole problem at all. ...
    (sci.physics.relativity)