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| Tags: inertial, least, light, observers, ones, same, speed |
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#21
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CORRECTiON: e=RESTmass*c^2=(mol part)*K*Volt*meter/c^2.
Volt*Amp*sec = GUESS EQUiVALENT iNTRiNSiC unit energy e (mol part)*K*Volt*meter = -- -- -- -- -- -- -- -- = (GUESS unit REST mass)*c^2. c^2 Whe GUESS iSS, TEST SHELL mass m1 = STANDARD TEST REST-mass, at SUBMERGED weightlessness, in STANDARD AMBiENT medium: m1 = mD - mS = N*u = {do - (mi / Vi)} = [mph] = SHELL volume*density = Vs*ds = Vi*(do - di) = (Po - Pi)*Vi*dx / Po = 4*thick*S*Vi*dx / Po*(cavity dia + SHELL thickness) = h*fL / c^2 = nA*{mph}*ls / rA = mS / (n - 1) = N / Nu mD / n = ni*u / xi = Vdis*Ddis / n = nA*hbar / rA*c = iNTRiNSiC energy / c^2 = (mol part)*K*Volt*m / c^4 ..line CORRECTiON *m a meter. brian a m stuckless Bilge wrote: Daniel Weston, incompetent asshole: "Why is the speed of light the same for all observers?" Ans: No body knows. Wrong. What nobody knows is how to get the answer through your thick skull. That is an entirely different question. That is the correct answer and it should be given quickly. Some un professional defenders of relativity on this ng, become incredibly defensive when asked this question or like questions where the answer is unknown. By their immature and canned responses, you would think that somebody's ancestry had been called into question. It is not a crime to ask why, meaning by what mechanism. No, but it is a crime to reject the answer because it doesn't fit your naive world view. It is not a crime to answer such questions with an honest and simple, 'we don't know'. No, but it is a crime to blame your inability to understand the answer on all of those who gave you the answer you requested. |
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#22
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Dirk Van de moortel wrote:
"Spoonfed" wrote in message ups.com... snip Now, I don't quite see how this particular idea leads to a constant speed of light, but it is a bit strange, anyway. I'm just bringing it up because that's a question I've never fully explored. I do remember sometime in college when I THOUGHT I understood how electric and magnetic fields explained the speed of light. Multiplying the permittivity times the permeability of free space yielded the speed of light. However, I can't remember what would make a person multiply these two values together, except that they happen to produce the speed of light. So, I guess the question I want to ask is, why do you multiply permittivity and permeability together? When you juggle with Maxwell's equations, they turn out to produce standard wave equations that all have epsilon_0 * mu_0 as a coefficient of the second order partial time derivative term. The standard wave equation has 1 / wave speed^2 as its coefficient at that place http://mathworld.wolfram.com/WaveEquation.html Dirk Vdm Ahhh, yes... I think I may have seen all the steps somewhere in my education, but I never got around to putting them together in order. Rush, rush, rush. I took Classical Electrodynamics after 10 years without even looking at a differential equations problem, so unfortunately, most of it went over my head. Now, the wave equation refers to density, in the case of water waves or sound waves, but it's a little more complicated in the case of light waves, right? Now I did a quick google image search for Maxwell's equations and found this page: http://home.usit.net/~cmdaven/electro.htm by Clyde Davenport. He shows some equations out of Jackson, but doesn't define A here. Ahhh, here it is, in section 6.2 of Jackson. He defines the vector potential, A and the scalar potential, Phi in terms of the magnetic and electric field, and ends up with two equations that look just like the wave equation, except with sources due to charge density and current density. I begin to see a route, though it does look harrrrrd. Jackson's explanation takes up less than two pages, which probably means about ten or twenty pages of "WTF?" for me. |
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#23
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Sue... wrote: Spoonfed wrote: Sue... wrote: Daniel Weston wrote: "Why is the speed of light the same for all observers?" Ans: No body knows. Students of electromagnetism know...or think they know: http://www.conformity.com/0102reflectionsfig3.gif from: http://www.conformity.com/0102reflections.html http://physics.nist.gov/cuu/Images/alphaeq.gif from: http://physics.nist.gov/cuu/Constants/alpha.html But the study of electromagnetism is uh...harrrrd.... ya hafta be workin' harrrd ;-) Seems like the right direction... But all that hard stuff is pretty confusing. Do you suppose we could find some explanation that may not be so hard? Maybe not a timeline but at least a list of goals, and maybe a roadmap to understanding? Goals? 1. Learn below 30 GHz 2. Learn above 30 GHz Two steps because, when the antenna is built out of oscillators things get tricker... but the same rules apply. Okay, start with a stationary charged particle. It has a central electric field. If that particle is moving, if I am not mistaken, it creates a magnetic field. However, somebody moving along with the particle doesn't see the magnetic field. Start with two particles. + and - Move one in the real world filled with + and -. It is harder but the integral form is 'timeless' (pun intended) http://en.wikipedia.org/wiki/Multiple_integral Now, I don't quite see how this particular idea leads to a constant speed of light, but it is a bit strange, anyway. I'm just bringing it up because that's a question I've never fully explored. http://physics.nist.gov/cuu/Images/alphaeq.gif from: http://physics.nist.gov/cuu/Constants/alpha.html The mass of a charge pair (0.511 MeV) is like the mass of a guitar string. The Coulomb force is like the tension on the guitar string. AFAIK... no relation to m therory. LOL I do remember sometime in college when I THOUGHT I understood how electric and magnetic fields explained the speed of light. Multiplying the permittivity times the permeability of free space yielded the speed of light. However, I can't remember what would make a person multiply these two values together, except that they happen to produce the speed of light. Substitute "homogenous universe" (377 ohms) for free space and it is easier to see. Permeability we associate with spinning. So we have to be near some thing spinning. See: http://www.conformity.com/0102reflectionsfig3.gif from: http://www.conformity.com/0102reflections.html So, I guess the question I want to ask is, why do you multiply permittivity and permeability together? As you are closer to matter the spinning magnetic domains predominate as an energy storage element. When you are farther from matter, the inertia of the charge pair predominates. Because both eps and mu both represent storage, and thus delay, they can be normalized and combined for the SOL formula. Also you have to careful about cgs, MKS and SI differences as you calculate with dielectrics. http://scienceworld.wolfram.com/phys...ptibility.html Sue... Sue, I know very little particle physics, and I I am a bit troubled that this explanation to why the speed of light is constant *appears* so much different from the explanation which seems to make sense. Is this explanation the same as the explanation that Dirk has given, only approaching it from another direction, or is this an alternative explanation? Regardless, I cannot detect any contextual relationship between your statements mine throughout your response. If you would care to start over, please clarify what I am saying or asking if you don't know, use no abbreviations and connect the dots very carefully, since I have no background in particle physics. Thanks, Jonathan Doolin |
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#24
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"Spoonfed" wrote in message oups.com... Dirk Van de moortel wrote: "Spoonfed" wrote in message ups.com... snip Now, I don't quite see how this particular idea leads to a constant speed of light, but it is a bit strange, anyway. I'm just bringing it up because that's a question I've never fully explored. I do remember sometime in college when I THOUGHT I understood how electric and magnetic fields explained the speed of light. Multiplying the permittivity times the permeability of free space yielded the speed of light. However, I can't remember what would make a person multiply these two values together, except that they happen to produce the speed of light. So, I guess the question I want to ask is, why do you multiply permittivity and permeability together? When you juggle with Maxwell's equations, they turn out to produce standard wave equations that all have epsilon_0 * mu_0 as a coefficient of the second order partial time derivative term. The standard wave equation has 1 / wave speed^2 as its coefficient at that place http://mathworld.wolfram.com/WaveEquation.html Dirk Vdm Ahhh, yes... I think I may have seen all the steps somewhere in my education, but I never got around to putting them together in order. Rush, rush, rush. I took Classical Electrodynamics after 10 years without even looking at a differential equations problem, so unfortunately, most of it went over my head. Now, the wave equation refers to density, in the case of water waves or sound waves, but it's a little more complicated in the case of light waves, right? Essentially it's always the same form \/^2 F = 1/v^2 @^2F/@t^2 where \/^2 is the Laplacian and @/@t partial time derivative. See http://mathworld.wolfram.com/WaveEquation.html Now I did a quick google image search for Maxwell's equations and found this page: http://home.usit.net/~cmdaven/electro.htm by Clyde Davenport. He shows some equations out of Jackson, but doesn't define A here. Ahhh, here it is, in section 6.2 of Jackson. He defines the vector potential, A and the scalar potential, Phi in terms of the magnetic and electric field, and ends up with two equations that look just like the wave equation, except with sources due to charge density and current density. I begin to see a route, though it does look harrrrrd. Jackson's explanation takes up less than two pages, which probably means about ten or twenty pages of "WTF?" for me. I don't have Jackson. It's seems rather well spelled out in Bo Thide's http://www.plasma.uu.se/CED/Book/index.html#top Download the pdf and have a look at chapter 2. You'll have to search for Maxwell's equations where epsilon_0 and mu_0 are used. For instance in the Wikipedia http://en.wikipedia.org/wiki/Maxwell's_equations under the header "In vacuum, without charges or currents". Enjoy puzzling like I did some .... oops ... 28 years ago now :-) Dirk Vdm |
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#25
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Spoonfed wrote: Sue... wrote: Spoonfed wrote: Sue... wrote: Daniel Weston wrote: "Why is the speed of light the same for all observers?" Ans: No body knows. Students of electromagnetism know...or think they know: http://www.conformity.com/0102reflectionsfig3.gif from: http://www.conformity.com/0102reflections.html http://physics.nist.gov/cuu/Images/alphaeq.gif from: http://physics.nist.gov/cuu/Constants/alpha.html But the study of electromagnetism is uh...harrrrd.... ya hafta be workin' harrrd ;-) Seems like the right direction... But all that hard stuff is pretty confusing. Do you suppose we could find some explanation that may not be so hard? Maybe not a timeline but at least a list of goals, and maybe a roadmap to understanding? Goals? 1. Learn below 30 GHz 2. Learn above 30 GHz Two steps because, when the antenna is built out of oscillators things get tricker... but the same rules apply. Okay, start with a stationary charged particle. It has a central electric field. If that particle is moving, if I am not mistaken, it creates a magnetic field. However, somebody moving along with the particle doesn't see the magnetic field. Start with two particles. + and - Move one in the real world filled with + and -. It is harder but the integral form is 'timeless' (pun intended) http://en.wikipedia.org/wiki/Multiple_integral Now, I don't quite see how this particular idea leads to a constant speed of light, but it is a bit strange, anyway. I'm just bringing it up because that's a question I've never fully explored. http://physics.nist.gov/cuu/Images/alphaeq.gif from: http://physics.nist.gov/cuu/Constants/alpha.html The mass of a charge pair (0.511 MeV) is like the mass of a guitar string. The Coulomb force is like the tension on the guitar string. AFAIK... no relation to m therory. LOL I do remember sometime in college when I THOUGHT I understood how electric and magnetic fields explained the speed of light. Multiplying the permittivity times the permeability of free space yielded the speed of light. However, I can't remember what would make a person multiply these two values together, except that they happen to produce the speed of light. Substitute "homogenous universe" (377 ohms) for free space and it is easier to see. Permeability we associate with spinning. So we have to be near some thing spinning. See: http://www.conformity.com/0102reflectionsfig3.gif from: http://www.conformity.com/0102reflections.html So, I guess the question I want to ask is, why do you multiply permittivity and permeability together? As you are closer to matter the spinning magnetic domains predominate as an energy storage element. When you are farther from matter, the inertia of the charge pair predominates. Because both eps and mu both represent storage, and thus delay, they can be normalized and combined for the SOL formula. Also you have to careful about cgs, MKS and SI differences as you calculate with dielectrics. http://scienceworld.wolfram.com/phys...ptibility.html Sue... Sue, I know very little particle physics, and I I am a bit troubled that this explanation to why the speed of light is constant *appears* so much different from the explanation which seems to make sense. The relation from NIST doesn't make sense ? Is this explanation the same as the explanation that Dirk has given, only approaching it from another direction, or is this an alternative explanation? Regardless, I cannot detect any contextual relationship between your statements mine throughout your response. You consider his delusions about my identity are an explanation for SOL? If you would care to start over, please clarify what I am saying or asking if you don't know, use no abbreviations and connect the dots very carefully, since I have no background in particle physics. You don't need particle physics except knowing that charges have constant mass. Surely you don't think that particles are what causes a charged comb to attract a pith ball ? Starting over: Click on Electrostatics at top of page and work through to Light chapter. The pdf files are big but have lots of illustrations. http://web.mit.edu/8.02t/www/802TEAL3D/teal_tour.htm Here is Maxwells equations from PoV you never imagined. http://arxiv.org/abs/physics/0204034 Sue... Thanks, Jonathan Doolin |
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#26
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Bilge wrote:
Daniel Weston, incompetent asshole: "Why is the speed of light the same for all observers?" Ans: No body knows. Wrong. What nobody knows is how to get the answer through your thick skull. That is an entirely different question. That is the correct answer and it should be given quickly. Some un professional defenders of relativity on this ng, become incredibly defensive when asked this question or like questions where the answer is unknown. By their immature and canned responses, you would think that somebody's ancestry had been called into question. It is not a crime to ask why, meaning by what mechanism. No, but it is a crime to reject the answer because it doesn't fit your naive world view. It is precisely by asking naive questions that Einstein was able to give not-in-the-least-naive answers. alt.asshole-factory --- good Lord, IS there such a group?? |
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#28
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jem wrote: Daniel Weston wrote: "Why is the speed of light the same for all observers?" Ans: No body knows. That is the correct answer and it should be given quickly. Some un professional defenders of relativity on this ng, become incredibly defensive when asked this question or like questions where the answer is unknown. By their immature and canned responses, you would think that somebody's ancestry had been called into question. It is not a crime to ask why, meaning by what mechanism. It is not a crime to answer such questions with an honest and simple, 'we don't know'. According to Relativity, the speed of light *isn't* the same for all observers. When measuured locally, or within Inertial reference frames, the speed of light in vacuum is constant because in 1983 the meter was redefined in such a way as to make it constant. Want the answer to a related question, like "Why does Nature have a speed limit?"? Well, suppose it didn't have one. Think about how you'd answer the question "Why doesn't Nature have a speed limit?". In that case, I'd like to see the smartass who thought up THAT question!! Fancy free, so to speak. |
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#29
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Mahmoud In My Dinner Jacket:
Bilge wrote: Daniel Weston, incompetent asshole: "Why is the speed of light the same for all observers?" Ans: No body knows. Wrong. What nobody knows is how to get the answer through your thick skull. That is an entirely different question. That is the correct answer and it should be given quickly. Some un professional defenders of relativity on this ng, become incredibly defensive when asked this question or like questions where the answer is unknown. By their immature and canned responses, you would think that somebody's ancestry had been called into question. It is not a crime to ask why, meaning by what mechanism. No, but it is a crime to reject the answer because it doesn't fit your naive world view. It is precisely by asking naive questions that Einstein was able to give not-in-the-least-naive answers. To compare and contrast your scenario with the case at hand, note that einstein spent at least a few hours trying to understand his question from a physical perspective and then answer it. On the other hand, mr. weston has been posting the same criticisms for years for the simple reason that he doesn't want to spend a few hours trying understand the answers he's been given from a wide variety of perspectives by a number of people who attempted to find some means of getting the point across. What stands in the way of mr. weston receiving the answer to the question he asked, is mr. weston, who will apparently not accept _any_ answer that is consistent with relativity. Ignorance due to lack of knowledge can be cured. A dedicated effort to remain ignorant in spite of having every opportunity to remedy the lack of knowledge, cannot, and mr. weston is about as dedicated as it gets. alt.asshole-factory --- good Lord, IS there such a group?? Believe it or not. Out of 40,000+ newsgroups, just imagine what else is out there. |
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#30
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Mahmoud In My Dinner Jacket wrote: wrote: Mahmoud In My Dinner Jacket wrote: wrote: Mahmoud In My Dinner Jacket wrote: Phase velocity and group velocity?? xxein: Try (c+v)^2 along with the mandatory (c-v)^2. Both are present at all times in all (inertial) frames. If you need further explanation, you are just a poser. Pssssssssst! You wan I should sell you some dirty postcards? xxein: I want to see them first, before I buy. Ya promise not to copy them without paying, now?! xxein: Of what value is a copy? I need to 'see' copy before I buy real. |
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