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Article #16147Re: Light has mass; That's smart
From: Pentcho Valev
Date: Sun, 13 Jul 2008 18:29
Date: Sun, 13 Jul 2008 18:29
25 lines
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2822 bytes
On Jul 13, 8:00 pm, Tom Roberts <tjroberts...@sbcglobal.net> wrote: > Pmb wrote in sci.physics: > > There is only one meaning to the term "mass" and that's m = p/v. > > [Be careful to define division of 3-vectors; say rather > that "mass" is the m in p=mv.] > > In Newtonian mechanics this is one of the many meanings of "mass", and > perhaps it is the defining one, perhaps not. The problem is that there > are many different aspects of "mass" that are all the same in Newtonian > mechanics, but are different in relativity. Newtonian mechanics is so dull and relativity is so exciting, aren't they Honest Roberts: http://en.wikipedia.org/wiki/Mass_in_General_Relativity "The concept of mass in general relativity (GR) is more complex than the concept of mass in special relativity. In fact, general relativity does not offer a single definition for the term mass, but offers several different definitions which are applicable under different circumstances. Under some circumstances, the mass of a system in general relativity may not even be defined." Pentcho Valev pvalev@yahoo.com
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X-Google-Thread: 10b271,d79749310233574e X-Google-Thread: 10f545,d79749310233574e X-Google-Thread: f6c41,d79749310233574e X-Google-Thread: fa4c1,fe3647d89db39948,start X-Google-Thread: f74ae,fe3647d89db39948,start X-Google-Attributes: gid10b271,gid10f545,gidf6c41,gidfa4c1,gidf74ae,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!x41g2000hsb.googlegroups.com!not-for-mail From: Pentcho Valev <pvalev@yahoo.com> Newsgroups: sci.physics,sci.physics.relativity,sci.physics.particle,fr.sci.physique,sci.astro Subject: Re: Light has mass; That's smart Date: Sun, 13 Jul 2008 11:29:34 -0700 (PDT) Organization: http://groups.google.com Lines: 25 Message-ID: <4661e7f7-88af-4b1d-9324-d462dbf6ebf6@x41g2000hsb.googlegroups.com> References: <2a09794c-7a26-49bc-9937-64ab3b297ee2@59g2000hsb.googlegroups.com> <48778013.19382DE8@hate.spam.net> <494a4cb9-367c-4e75-9c43-6ddab568eba3@l64g2000hse.googlegroups.com> <G6udnbt_18sRmufVnZ2dnUVZ_j-dnZ2d@comcast.com> <unrek.5245$cn7.1535@flpi145.ffdc.sbc.com> NNTP-Posting-Host: 89.2.86.30 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1215973774 2272 127.0.0.1 (13 Jul 2008 18:29:34 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Sun, 13 Jul 2008 18:29:34 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: x41g2000hsb.googlegroups.com; posting-host=89.2.86.30; posting-account=Lz-LbgoAAABPDavKeW-eYeobwLHD_cvQ User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1),gzip(gfe),gzip(gfe)