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Article #5409Re: THE BEST EXPLANATION OF LENGTH CONTRACTION
From: Denis Feldmann
Date: Fri, 07 Mar 2008 11:06
Date: Fri, 07 Mar 2008 11:06
41 lines
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3102 bytes
Rudolf Drabek a �crit : > On 6 Mrz., 21:31, Denis Feldmann <feldmann.denis.asuppri...@neuf.fr> > wrote: >> Rudolf Drabek a �crit : >> >> >> >>> I'm not good in understanding SR. >>> I only want to know if I look to the situation from the pole's frame: >>> So the distance between the barn doors is in any case too short, that >>> the pole can fit into the barn. >>> SR is symmetrical for time dilatation and length contraction, but not >>> for this situation. >>> Who can help me out. >> Easy: the whole scenario insist on *simultaneously closing the doors*, >> and simultaneity is not an absolute concept, so there is no >> contradiction. But, of course, any serious student of SR knows that, or >> can redemonstrate it to him(her)self convincingly, so you will only find >> crank answers here... > > I wanted to point out, that there are two scenarios and each one is > *true* for the corresponding observer. No, not really Einstein spended a lot of time > on that point regarding syncing clocks and simultaneity, here similar > problems can be seen. > I can accept two truth, only the symmetry is lost, which is a major > part of SR. No, you canot : it is obviously impossible to put the rod in the barn, so this scenario must have a flaw, and indeed trying to close the door simultaneously *and* enclose the rod is not possible. Do the (simple) calculation to check that... > So, who can help me out? > Length contr. is a consequence of c=const in all frames and not more. Sure
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X-Google-Thread: 10f545,77eb89d693e39266 X-Google-Thread: 10b271,77eb89d693e39266 X-Google-Thread: fa4c1,77eb89d693e39266 X-Google-Thread: 1139f8,77eb89d693e39266 X-Google-Thread: f74ae,77eb89d693e39266 X-Google-Attributes: gid10f545,gid10b271,gidfa4c1,gid1139f8,gidf74ae,public,usenet X-Google-Language: ENGLISH,ASCII X-FeedAbuse: http://nntpfeed.proxad.net/abuse.pl feeded by 88.191.71.11 Path: arc1-ca.pugleaf.net!g2news1.google.com!news4.google.com!proxad.net!feeder1-2.proxad.net!nntpfeed.proxad.net!news.netfinity.fr!netfinity.fr!not-for-mail From: Denis Feldmann <feldmann.denis.asupprimer@neuf.fr> Newsgroups: sci.physics.relativity,sci.physics,fr.sci.physique,fr.sci.maths,sci.astro Subject: Re: THE BEST EXPLANATION OF LENGTH CONTRACTION Date: Fri, 07 Mar 2008 12:06:58 +0100 Organization: Netfinity NNTP Server Lines: 41 Message-ID: <fqr7ki$6ir$1@netfinity.fr> References: <4caf8a21-acd0-42de-a040-842dcad0e000@n77g2000hse.googlegroups.com> <c40a0034-d54c-4d9f-91af-7117209af32a@e31g2000hse.googlegroups.com> <fqpka6$34o$1@netfinity.fr> <dc2d0749-a41b-43a0-bd71-cc1f4248ccc3@n77g2000hse.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Trace: netfinity.fr yEiJGz3M3QrgjV26CuDwP42x5UchLzhAOqci8q6Rvq4= X-Complaints-To: abuse@netfinity.fr In-Reply-To: <dc2d0749-a41b-43a0-bd71-cc1f4248ccc3@n77g2000hse.googlegroups.com> X-Antivirus-Status: Clean X-Antivirus: avast! (VPS 080306-1, 06/03/2008), Outbound message User-Agent: Thunderbird 2.0.0.12 (Windows/20080213)