Article View: sci.physics
Article #16148Re: Light has mass; That's smart
From: BradGuth
Date: Sun, 13 Jul 2008 22:39
Date: Sun, 13 Jul 2008 22:39
35 lines
3377 bytes
3377 bytes
On Jul 13, 11:29 am, Pentcho Valev <pva...@yahoo.com> wrote: > 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 > pva...@yahoo.com Special conditional laws of physics are required in order to continually snooker and dumbfound humanity for all it's worth. It also helps if you are Jewish, as otherwise discovering the absolute holy grail of the god particle, the mass of a photon, or even that of dirt cheap fusion energy will not likely get you a Nobel. - Brad Guth Brad_Guth Brad.Guth BradGuth
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X-Google-Thread: 10b271,d79749310233574e X-Google-Thread: 10f545,d79749310233574e X-Google-Thread: f6c41,d79749310233574e X-Google-Thread: fa4c1,fe3647d89db39948 X-Google-Thread: f74ae,fe3647d89db39948 X-Google-Attributes: gid10b271,gid10f545,gidf6c41,gidfa4c1,gidf74ae,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!p25g2000hsf.googlegroups.com!not-for-mail From: BradGuth <bradguth@gmail.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 15:39:20 -0700 (PDT) Organization: http://groups.google.com Lines: 35 Message-ID: <49c46309-057b-435c-b89e-ade9fe3a9cbe@p25g2000hsf.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> <4661e7f7-88af-4b1d-9324-d462dbf6ebf6@x41g2000hsb.googlegroups.com> NNTP-Posting-Host: 64.91.99.76 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Trace: posting.google.com 1215988761 12312 127.0.0.1 (13 Jul 2008 22:39:21 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Sun, 13 Jul 2008 22:39:21 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: p25g2000hsf.googlegroups.com; posting-host=64.91.99.76; posting-account=nf79RwoAAABXjvy5ztMzmPxgY1WGoktI User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12,gzip(gfe),gzip(gfe)