Re: Clock synch

Nicolaas Vroom wrote:
"Tom Roberts" <tjroberts137@xxxxxxxxxxxxx> schreef in bericht news:Z3SAg.3029$kO3.2790@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
There is no "time dilation", in the sense of a clock physically ticking slower, or in the sense of "time moving slower". There is no "shortening/elongating", in the sense of a given object physically getting shorter or longer.

The effects called "time dilation" and "length contraction" in SR are not physical effects, and are due to different measurement procedures used by differently moving observers.

That means, if I understand you correct, that an observer at rest
(not using a moving clock)
can never detect any effect in which "length contraction" is
involved ?

Not at all. An observer can detect length contraction by performing an appropriate measurement that projects the proper length of a moving object onto her own spatial coordinates. It's just that no such measurement has been carried out to the requisite accuracy, basically because it is infeasible to measure this accurately enough with existing technology.

Measuring time dilation is MUCH easier.


Tom Roberts
.

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