Article View: sci.physics.relativity
Article #1039Re: HERBERT DINGLE ASKS EINSTEINIANA
From: Pentcho Valev
Date: Sun, 18 Oct 2009 13:00
Date: Sun, 18 Oct 2009 13:00
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4956 bytes
On Oct 18, 2:28 pm, "Dirk Van de moortel" <dirkvandemoor...@nospAm.hotmail.com> wrote: > Pentcho Valev <pva...@yahoo.com> wrote in message > > 5146f720-ca66-4ab2-8501-ffc2fa9cb...@j24g2000yqa.googlegroups.com > > >http://en.wikipedia.org/wiki/Herbert_Dingle > > "Herbert Dingle (2 August 1890 - 4 September 1978), an English > > physicist and natural philosopher, who served as president of the > > Royal Astronomical Society from 1951 to 1953 (...) He was one of the > > founders of the British Society for the History of Science, and served > > as President from 1955 to 1957. He founded what later became the > > British Society for the Philosophy of Science as well as its journal, > > the British Journal for The Philosophy of Science." > > Here's how utterly stupid became at the end of his life: > http://users.telenet.be/vdmoortel/dirk/Physics/Dingle/DinglesTrivialF... > > Dirk Vdm If a theory says "The greenness of the crocodile exceeds its length", the refutation is impossible or, if someone is naive enough to try one, Clever Moortel is always there to demonstrate utter stupidity. Why don't you look, Clever Moortel, for utter stupidity inside Einsteiniana? Can a 80m long pole be safely trapped inside a 40m long barn? Can a bug be both dead and alive? http://math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html "These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn. Now someone takes the pole and tries to run (at nearly the speed of light) through the barn with the pole horizontal. Special Relativity (SR) says that a moving object is contracted in the direction of motion: this is called the Lorentz Contraction. So, if the pole is set in motion lengthwise, then it will contract in the reference frame of a stationary observer.....So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. Of course, you open them again pretty quickly, but at least momentarily you had the contracted pole shut up in your barn. The runner emerges from the far door unscathed.....If the doors are kept shut the rod will obviously smash into the barn door at one end. If the door withstands this the leading end of the rod will come to rest in the frame of reference of the stationary observer. There can be no such thing as a rigid rod in relativity so the trailing end will not stop immediately and the rod will be compressed beyond the amount it was Lorentz contracted. If it does not explode under the strain and it is sufficiently elastic it will come to rest and start to spring back to its natural shape but since it is too big for the barn the other end is now going to crash into the back door and the rod will be trapped in a compressed state inside the barn." http://hyperphysics.phy-astr.gsu.edu/Hbase/Relativ/bugrivet.html "The bug-rivet paradox is a variation on the twin paradox and is similar to the pole-barn paradox.....The end of the rivet hits the bottom of the hole before the head of the rivet hits the wall. So it looks like the bug is squashed.....All this is nonsense from the bug's point of view. The rivet head hits the wall when the rivet end is just 0.35 cm down in the hole! The rivet doesn't get close to the bug....The paradox is not resolved." Pentcho Valev pvalev@yahoo.com
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X-Google-Thread: 237b8ad48,a4e2fc2c238607ec X-Google-Attributes: gid237b8ad48,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news2.google.com!postnews.google.com!e8g2000yqo.googlegroups.com!not-for-mail From: Pentcho Valev <pvalev@yahoo.com> Newsgroups: sci.physics.relativity,sci.physics,fr.sci.physique,fr.sci.astrophysique Subject: Re: HERBERT DINGLE ASKS EINSTEINIANA Date: Sun, 18 Oct 2009 06:00:46 -0700 (PDT) Organization: http://groups.google.com Lines: 65 Message-ID: <3203dc7a-699a-4ba9-a353-7801fa332ab1@e8g2000yqo.googlegroups.com> References: <5146f720-ca66-4ab2-8501-ffc2fa9cb8c7@j24g2000yqa.googlegroups.com> <zRDCm.1485$ZA4.65@newsfe17.ams2> NNTP-Posting-Host: 89.215.201.45 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1255870847 15757 127.0.0.1 (18 Oct 2009 13:00:47 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Sun, 18 Oct 2009 13:00:47 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: e8g2000yqo.googlegroups.com; posting-host=89.215.201.45; 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)