Question about time travel
in [Physics]
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From: zookumar yelubandi on 27 Jul 2010 12:18 Cl.Mass� wrote: > "zookumar yelubandi" <zookumar(a)yahoo.ca> a �crit dans le message de > news:4c4cca77$0$11824$9a566e8b(a)news.aliant.net... > > To wit, Lorentz geometry requires the speed of light to behave > > in a certain way (e.g. to be constant). Un(fortunately??), the speed > > of light requires nothing from Lorentz geometry. > Well, it's a stupid idea to speak about physics on this NG. Minkowski > geometry *is* a consequence of the invariance of light speed, *plus* some > minor assumptions, plus the requirement of a geometry. Special relativity > can be formulated without an explicit space-time structure. Sci.physics is what it is. Rec.org.mensa is what it is. Hubris is what it is. Simple gedanken experiment. Turn on the light. When the light is off, what speed does light have? When the light is on, what speed does light have? Are the two speeds the same? If they're not, then what does the invariance of light speed mean? Uncle Zook
From: Uncle Ben on 27 Jul 2010 18:58 On Jul 27, 12:18 pm, zookumar yelubandi <zooku...(a)yahoo.ca> wrote: > Cl.Massé wrote: > > "zookumar yelubandi" <zooku...(a)yahoo.ca> a écrit dans le message de > >news:4c4cca77$0$11824$9a566e8b(a)news.aliant.net... > > > To wit, Lorentz geometry requires the speed of light to behave > > > in a certain way (e.g. to be constant). Un(fortunately??), the speed > > > of light requires nothing from Lorentz geometry. > > Well, it's a stupid idea to speak about physics on this NG. Minkowski > > geometry *is* a consequence of the invariance of light speed, *plus* some > > minor assumptions, plus the requirement of a geometry. Special relativity > > can be formulated without an explicit space-time structure. > > Sci.physics is what it is. > > Rec.org.mensa is what it is. > > Hubris is what it is. > > Simple gedanken experiment. Turn on the light. When the light > is off, what speed does light have? When the light is on, what speed > does light have? Are the two speeds the same? If they're not, then > what does the invariance of light speed mean? > > Uncle Zook Yes, they are. So what? Uncle Ben
From: bert on 27 Jul 2010 21:29 On Jul 27, 6:58 pm, Uncle Ben <b...(a)greenba.com> wrote: > On Jul 27, 12:18 pm, zookumar yelubandi <zooku...(a)yahoo.ca> wrote: > > > > > > > Cl.Massé wrote: > > > "zookumar yelubandi" <zooku...(a)yahoo.ca> a écrit dans le message de > > >news:4c4cca77$0$11824$9a566e8b(a)news.aliant.net... > > > > To wit, Lorentz geometry requires the speed of light to behave > > > > in a certain way (e.g. to be constant). Un(fortunately??), the speed > > > > of light requires nothing from Lorentz geometry. > > > Well, it's a stupid idea to speak about physics on this NG. Minkowski > > > geometry *is* a consequence of the invariance of light speed, *plus* some > > > minor assumptions, plus the requirement of a geometry. Special relativity > > > can be formulated without an explicit space-time structure. > > > Sci.physics is what it is. > > > Rec.org.mensa is what it is. > > > Hubris is what it is. > > > Simple gedanken experiment. Turn on the light. When the light > > is off, what speed does light have? When the light is on, what speed > > does light have? Are the two speeds the same? If they're not, then > > what does the invariance of light speed mean? > > > Uncle Zook > > Yes, they are. So what? > > Uncle Ben- Hide quoted text - > > - Show quoted text - Light goes always at 186242 mps Photons never slow down Photons never bounce. TreBert
From: HardySpicer on 27 Jul 2010 21:49
On Jul 28, 1:29 pm, bert <herbertglazie...(a)msn.com> wrote: > On Jul 27, 6:58 pm, Uncle Ben <b...(a)greenba.com> wrote: > > > > > On Jul 27, 12:18 pm, zookumar yelubandi <zooku...(a)yahoo.ca> wrote: > > > > Cl.Massé wrote: > > > > "zookumar yelubandi" <zooku...(a)yahoo.ca> a écrit dans le message de > > > >news:4c4cca77$0$11824$9a566e8b(a)news.aliant.net... > > > > > To wit, Lorentz geometry requires the speed of light to behave > > > > > in a certain way (e.g. to be constant). Un(fortunately??), the speed > > > > > of light requires nothing from Lorentz geometry. > > > > Well, it's a stupid idea to speak about physics on this NG. Minkowski > > > > geometry *is* a consequence of the invariance of light speed, *plus* some > > > > minor assumptions, plus the requirement of a geometry. Special relativity > > > > can be formulated without an explicit space-time structure. > > > > Sci.physics is what it is. > > > > Rec.org.mensa is what it is. > > > > Hubris is what it is. > > > > Simple gedanken experiment. Turn on the light. When the light > > > is off, what speed does light have? When the light is on, what speed > > > does light have? Are the two speeds the same? If they're not, then > > > what does the invariance of light speed mean? > > > > Uncle Zook > > > Yes, they are. So what? > > > Uncle Ben- Hide quoted text - > > > - Show quoted text - > > Light goes always at 186242 mps Photons never slow down Photons > never bounce. TreBert Never bounce? Even off a mirror? |