Article View: sci.physics.relativity
Article #5442Re: SR cannot determine Contraction
From: Pentcho Valev
Date: Mon, 03 Mar 2008 07:12
Date: Mon, 03 Mar 2008 07:12
24 lines
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3355 bytes
On Mar 3, 4:09 am, Tom Roberts <tjroberts...@sbcglobal.net> wrote in sci.physics.relativity: > Dono wrote: > > Objects (like the pole) constrained to fit inside a smaller confine > > (like the barn) experience stress. > > You just don't get it. 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. When the rear end of the pole is past the entrance > door, close that door, quickly! As soon as the entrance door is closed, > open the exit door (all times in the barn frame). Assuming the doors > move rapidly enough, then at least in principle both doors can be closed > with the pole inside the barn (in the barn frame), and the pole never > touches either door. Roberts Roberts don't open the exit door and you will understand what clever Dono wants to explain to you. Pentcho Valev pvalev@yahoo.com
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X-Google-Thread: 10f545,cac579628f39e93d X-Google-Thread: 10b271,4ee0571d17ce45ea X-Google-Thread: fa4c1,4ee0571d17ce45ea X-Google-Thread: 1139f8,4ee0571d17ce45ea X-Google-Thread: f55d3,4ee0571d17ce45ea X-Google-Attributes: gid10f545,gid10b271,gidfa4c1,gid1139f8,gidf55d3,public,usenet X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!13g2000hsb.googlegroups.com!not-for-mail From: Pentcho Valev <pvalev@yahoo.com> Newsgroups: sci.physics.relativity,sci.physics,fr.sci.physique,fr.sci.maths,fr.sci.philo Subject: Re: SR cannot determine Contraction Date: Sun, 2 Mar 2008 23:12:14 -0800 (PST) Organization: http://groups.google.com Lines: 24 Message-ID: <e8e8afb8-2aaf-44b4-8d99-88f711b41b78@13g2000hsb.googlegroups.com> References: <4d7a4156-1486-45a7-b7af-46b7ab1bc981@e10g2000prf.googlegroups.com> <e3b19017-b8d8-48f3-ad28-0f0f693d0dc3@u69g2000hse.googlegroups.com> <RJNwj.12735$Ch6.3827@newssvr11.news.prodigy.net> <01f48ad4-6218-489f-b5fe-e44562f993b8@m23g2000hsc.googlegroups.com> <Ol5xj.7139$Mw.1796@nlpi068.nbdc.sbc.com> <1b1eade1-d0bb-4442-93e3-040dcbfe638f@b1g2000hsg.googlegroups.com> <_xWxj.14404$R84.12760@newssvr25.news.prodigy.net> <751ffd74-bd9c-4836-aff2-1280b2f8d385@s37g2000prg.googlegroups.com> <e68e3fde-5785-49ba-af67-08653fd954b6@u69g2000hse.googlegroups.com> <71b513fd-7e67-46dd-a1ab-0aba4039920c@e25g2000prg.googlegroups.com> <dc2ee5c4-0d4a-4078-b361-d6b65165b7f2@h25g2000hsf.googlegroups.com> <bd28e485-03e7-47de-bebf-d09b596b6eef@s19g2000prg.googlegroups.com> <T5Jyj.5110$pl4.2688@newssvr22.news.prodigy.net> NNTP-Posting-Host: 85.91.141.159 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1204528335 28845 127.0.0.1 (3 Mar 2008 07:12:15 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Mon, 3 Mar 2008 07:12:15 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: 13g2000hsb.googlegroups.com; posting-host=85.91.141.159; posting-account=Lz-LbgoAAABPDavKeW-eYeobwLHD_cvQ User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30),gzip(gfe),gzip(gfe)