Re: Does anyone really know the physical cause for time dilation and length contraction?

From	Odd Bodkin <bodkinodd@gmail.com>
Newsgroups	sci.physics
Subject	Re: Does anyone really know the physical cause for time dilation and length contraction?
Date	2016-05-20 11:54 -0500
Organization	Aioe.org NNTP Server
Message-ID	<nhnfgf$5ce$1@gioia.aioe.org> (permalink)
References	(8 earlier) <896bab90-0c7a-4bb0-a887-196e3f68fc51@googlegroups.com> <nhkcm4$1f7r$1@gioia.aioe.org> <f684af50-f782-4216-aa50-4faef65cd4e3@googlegroups.com> <nhkrlt$a8a$1@gioia.aioe.org> <21decc40-dbc0-4d07-8131-a2714fcd6c52@googlegroups.com>

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On 5/20/2016 6:00 AM, Nicolaas Vroom wrote:
> Op donderdag 19 mei 2016 19:04:08 UTC+2 schreef Odd Bodkin:
>> On 5/19/2016 11:03 AM, Nicolaas Vroom wrote:
>
>>>>> The link:
>>>>> http://www.aps.anl.gov/About/APS_Overview/linac.html
>>>>> tells you that c = 299792458 m/sec but not how this speed is measured.
>>>>> When I read the text, what they measure is the speed of electrons.
>>>>
>>>> That's because you're not reading about the part of the accelerator
>>>> where the photons are in flight. Good grief.
>>>
>>> Why do n't you supply me with a link that gives the details?
>>
>> Because I cater to neither your laziness or your incompetence at doing
>> library research. This is a basic skill that needs to be learned through
>> practice.
>
> It is always good to read a honest review.
> The problem is I have tried to find more background information related
> to your text. But I think I failed.

Yes, I think you did.

> I used for google search:
> "advanced photon source argonne national laboratory wiggler magnets"

Did you refine your search after that, or did you just try this and give 
up? When you go to the library, do you open up the first book that pull 
down from the shelf, and if the answer is not in it, you give up?

> I hope that also other readers are interested in the details
> so please give me better "google search" details.

Try doing a search in arxiv.org or a better Google search tool: 
http://scholar.google.com.


>
>>>> Nicolaas, this is naive at best. Physicists have the obligation to
>>>> answer questions if they have taken the job of teaching a class and the
>>>> people asking the question have paid tuition to take that class.
>>>
>>> Sorry, I do not think that physicists only answer questions when they
>>> have a teaching job. It sounds narrow minded.
>>
>> Well you tell me how well reality meets your expectations.
>
> My expectations are zero.
> The reality is completely outside my imagination.
> Around 1970 we had IBM and the seven dwarfs but no internet and all?
> knowledge came from our local library.

Which is still available.

> Around 1995 I owned my first Pc and we had Internet.
> Now we have https://arxiv.org/ with millions of free state of the art
> documents.

And so why did you do an ordinary Google search to learn about the APS, 
and why did you only look at overview web pages? Why did you not look 
for papers about APS on arxiv.org?

> What is so good at the end of each document there are links to
> other documents which allow you to get more background information and
> which keep me busy for the rest of my life.
> The same for Wikipedia as start-up toolkit.
>
> Enjoy.
>
> Nicolaas Vroom
> http://users.pandora.be/nicvroom/
>


-- 
Odd Bodkin --- maker of fine toys, tools, tables

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