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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT - A Conundrum for BottleBob
Cliff wrote: BB, You are allowed to ask for help on this one but only by crossposting asking for it g. You have a 1 meter diameter spherical surface of Unobtanium 597. It has no mass. This material is 100% reflective in the entire electromagnetic spectrum, has zero thermal conductivity, infinite strength and reflects all known particles as well. Inside this sphere is a 10 kilogram fissionable mass, triggered to explode in a nuclear fireball at a huge efficiency *at a random time*. When it goes off half it's mass will, in the end, become photons of various sorts and the particles that remain will all be neutrons (and thus not interact with the photons). The photons just keep bouncing off the inside of the sphere ...... How much does the sphere and it's contents mass? When? Remember Schrodinger's cat ... Now, about all those photons (energy, right?) ..... Thought I'd start over a bit & add a few groups .... So far the results are that *some* seem to be claiming that photons have mass and that the mass remains constant as a result. Shu posted this as her "answer": [ you do know that energy has mass right? http://math.ucr.edu/home/baez/=ADphy...t_ma=ADss.html ] Added questions: What is the "missing mass" (or needed "dark matter") of the universe compared to all of those photons in the same universe? Someone in one of these groups probably knows so I'm a bit curious. Perhaps a "photon energy per cubic light second/second" compared to a "missing mass per cubic light second" ratio or something .... --=20 Cliff |
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CIhupr posted:
" So far the results are that *some* seem to be claiming that photons have mass and that the mass remains constant as a result." Has anyone ever considered looking this up in a good Physics 101 textbook and putting this uninformed and largely incorrect speculation to rest? (Halliday & Resnick's 'Fundamentals of Physics' would be a good start.) Out of curiousity, why is this being posted in rec.creafts.metalworking? Harry C. |
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Cliff, there is such a thing as a library...generally a large building
containing many books... Oh Hell, this dumb troll is not worth the effort of posting anything more! Harry C. |
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