$ Tom's point-ROD mass.!!
Yes, but *ONLY* in the REAL WORLD; NOT in GR, at all, dimwit.!!
BECAUSE ..the GR gtr Tivity TEST-mass is a POiNT-mass *ONLY*.!!
So, ONLY "when LOOKed AT" simultaneously it STRETCHES, right.?!!
There is NO "DiFFERENCE in SiMULTANEiTY" ..numb-skull.!!

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Tom Roberts wrote:

schoenfeld1@gmail.com wrote:

#1 - the acceleration applies to all points on the rod
simultaneously relative to the stationary frame.

it would violate elastic laws if it DIDN'T STRETCH.

Yes. So you agree that the rod has stretched in its own frame.
As I said.

That rod is quite clearly stretched.
And the rockets quite clearly did it. <shrug>

There are no "mystical forces" here, there are rockets that pull on the
rod and stretch it. <shrug>

No, it just that you cannot read what you yourself have written above.
The rod stretches in its own frame. YOU SHOWED THAT. The only "*****"
is what you write.

It is you who does not understand. You showed the math above,
The rod _DOES_ stretch when you accelerate it in this manner.

Nonsense. The acceleration had the characteristic that it was

simultaneous everywhere relative to stationary frame --

NECESSARILY differ when looked at simultaneously in the rod's frame.
And that is what stretches the rod in its own frame.

So, ONLY "when LOOKed AT" simultaneously it STRETCHES, right.?!!

As I said before, at base this stretching is due to the
difference in simultaneity between moving frames.

-- one end of a 1.000000000000 meter steel ruler, do you really
believe it measures exactly 1.000000000000 meters while --

ends accelerate "just so", which requires more stretch than --

If I yank hard on --

".."just so", which REQUiREs more STRETCH than ..would naturally..",

-- from one end.

Tom Roberts