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Trish (capuchin@gte.net) wrote: : Neither of these viruses originate in the wickedness of mankind. They : arrived at the depletion of the tropical rain forest. The depletion of : the rain forest coincides with man's attitude that the world was created : to fulfill the needs of man. This attitute came about with religion. if i may make just a small remark here, i doubt that any of the arseholes chopping down trees for profit can call themselves dedicated christians, in the sense that they care what god has to say. god said care for the planet, not exploit it.Return to Top
wf3h@enter.net wrote: : : . i think everyone on these usenet groups would be more than : >willing to see the evidence you hold secret that will shatter the : >creationist dogma once and for all. : > : its ironic because i do this all the time. in fact. larry moran has : complained that i do nothing BUT this. would i be considered rude if i added that you are supposed to be showing how you have dogmatic irrefutable evidence for the origin of the universe, and not evidence on why creationism is wrong? : for you, ill make an exception. : here is why creationists lie : : 1. they believe in the literal truth of the bible : 2. they believe the earth is 6000 yrs old : 3. they believe this is scientific : 4. they believe that the methods of science should change to reflect : this ok, first off, i am a creationist. now, we can go from there. i do not believe the earth is 6000 years old. i have remarked to you about that before and yet you continue to hold it like some gospel truth (forgive the pun). because some believe it, doesn't mean all do. because some evolutionists believe in radio panspermia does not mean that all do. same thing. now, no christian has ever (unless he was high on something) said that the bible is a scientific text. ergo, no christian believes that creation *is* science, as you say above. creationists believe that god supernaturally created the universe. however, they do *not* believe that this is the end of science, and no creationist has ever said that to you. now the literal truth of the bible, yeah. we go for that. however, i must say that i have never heard a creationist say that any scientific method at all should change to reflect evolution/big bang theory. : now, the earth AINT 6000 yrs old. this is a subjective religious : belief.but creationist SAY this because they believe the bible is : LITERALLY true. this is a subjective religious belief, not a : scientific one. since it is false, and since they say its true it is a : lie. since it is a lie, and they believe revealed religion is : scientific they will say ANYTHING to help them push their ideology : that the bible is true. so you believe that if someone believes a lie, they themselves are guilty of lying? in addition, i would like to offer to anyone who desires it, an e-mail exchange explaining why the bible says the earth is far older than 6000 years. my address is above. : and that is why creationism is a lie all you say above is that creationists are liars, not that creationism is a lie. : >my computer existing has nothing to do with scientific skepticism. : : creationist dispute of science is, by definition not scientific. the : same principles that went into making the computer went into the : physics that found the universe is 10-15 billion years old; into the : geology that found the earth is 4.5 billion yrs old, etc. : so you are wrong so a dispute of law is not legal? a dispute over money is not financial? may i ask where you get your reasoning from? : you : >merely asked why would any scientist lie (imferring that all scientists : >are in fact purely altruistic and would *never ever* have any kind of : >self motivation whatsoever, and i proposed two answers as to why : >aprticular scientist *may* lie. : : nice projection. your inference is wrong. scientists are not saints. i agree. and finally i have gotten you to do the same. : i also did not call them liars, nor : >point out particular individuals] : : but creationism does. it says that creationism is science; but if its : science, why dont scientists accept it?Return to Topread the above. noone has ever said that creationism is science, and that is the whole of science, and that is the end of it. ever. unless they were highly *highly* deluded. : >let us examine what you say here. you say "since creationism is a lie". : >in other words, you know it to be false, without any shadow of a doubt, : >and with exacting, final experimental data that show it to be thus. in : >the absence of such earth-shattering experiments, i must ask that since : >you already believe creationism is a lie, would you not tend to see : >things as they would fit in an evolutionist eye? : : creationism is false because it doesnt use scientific methodology. it : believes revealed religion is scientific. since this is wrong, : creationism is a lie. as to earth shattering experiments, although : these have been done and show that creationism is wrong...BECAUSE : CREATIONISM IS A LIE...creationists will not accept this data. by : definition they cant. it is science. they do not accept science. thus : they do not accept the data. as to an 'evolutionist eye' you mean : 'scientists eye'. since all scientists accept evolution i plead guilty creationism is false, "because it doesn't use scientific methodology". hmmm... well stephen hawking has yet to perform an observable experiment on his ideas about the origin of the universe, ergo he hasn't used actual methodology, ergo he is false also. the existance of quarks hasn't been actually seen beyond the shadow of a doubt with experimentation, ergo it is false. whose side are you on again?
Hi. I would like to ask a question on the theory of error calculations. Situation: When adding two variables x1 and x2 with systematic errors dx1 and dx2, the error of the result is the arithmetic sum of dx1 and dx2: dx1 + dx2 When adding two variables y1 and y2 with statistical errors sy1 and sy2, the error of the result is the geometric sum of sy1 and sy2: SQRT( SQR( sy1 ) + SQR( sy2 ) ) Question: How do the errors add up if x1 were to be added to y1 ? As far as I know there is nothing in between the arithmetic and the geometric sum.Return to Top
In article <5asb6a$ma6$1@dartvax.dartmouth.edu> Archimedes.Plutonium@dartmouth.edu (Archimedes Plutonium) writes: > In articleReturn to Top> dik@cwi.nl (Dik T. Winter) writes: > > > > Let me recap here some facts : > > > p-adics form a field > > > > No. Obviously, if there *are* primes you do not have a field. > > 3-adics form a field, 5-adics form a field > any p-adic where p is prime forms a field Eh? Did you read what I wrote after the sentence above? If there *is* a prime, there is no field. In the 3-adics 3 is the only prime (%), but because there is a prime there is no field. In a field every element except 0 has a multiplicative inverse; there is no inverse of 3 in the 3-adics. There is no inverse of p in the p-adics. In the rationals for instance 3 is *not* prime. -- % Prime in the sense of prime ideals. Not in the sense of: there are no a and b such that a.b = 3; because there are such a and b (for instance: 2 * ...11111111120 = 10 = 3 in the 3-adics). My previous proof was a bit wrong however. If there is an element with a multiplicative inverse there is no prime in the traditional sense. That was what the original proved, but in that sense 3 is not even a prime in the 3-adics. However, an element without multiplicative inverse can still generate a prime ideal (as is the case with p in the p-adics), but in a field there are no such elements. -- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland, +31205924131 home: bovenover 215, 1025 jn amsterdam, nederland; http://www.cwi.nl/~dik/
In article <19970107113200.GAA27231@ladder01.news.aol.com>, lbsys@aol.com writes: >Im ArtikelReturn to Top, meron@cars3.uchicago.edu >schreibt: > >>>And this of course depends on the intelligence of the electorate, >>>unfortunately.... >> >>Democracy is a very just system. People get the government they >>deserve :-) > >I never liked that quote - although it's whitty and all that, but in >essence it says, that the weak (and poor in mind) are responsible for >choosing leaders which they cannot control effectively and thus are >rightfully betrayed and tricked by them. Then who is responsible. God? Aliens? But wait, don't reply yet. I think you miss what this phrase really says. It is not a condemnation of Democracy, by any means, on the contrary, it is a high praise. I'll get to it in a moment. > >How did the average decent american did deserve a crook like tricky Dicky >Nixon? People called him Tricky Dicky 20 years before he had been elected President. The knew what he was. They voted fro him nevertheless. >How did the world (and the US) deserve a man like former secr. of >defense McNamara, who after 30(!) years finally admits, that the US >engagement in Vietnam was based on no knowledge of the far east at all and >was the wrong thing to do. How many young and hopeful americans came home >'in a box' because of a few mens arrogance (meaning *deliberate* >illiterateness) - and why did they deserve to die young? McNamara was made Secretary of Defense by Kennedy, whom the people elected president because he didn't sweat an TV as much as Nixon. That was the determining factor. Do you see the point? > >Please elaborate the "justness" of this principle. I'll reply to the next thing first. > >In the 'Bill of Human Rights', one right has been forgotten: it's the >right to be governed by decent, honest people. No, there is no such right. You can state it but a right without a mechanism to achieve and maintain it is meaningless. It is like stating "everybody has the right to be happy". So, what he's supposed to do if he isn't? Sue the people? The government? Mother Nature? At most you can say "people have the right to pursue happiness." Still vague, but within some limits can be assured. No guarantees of success, mind you. So, the right you state sounds good but doesn't mean much. At best you can say "people have the right to pursue a decent, honest government". And what mechanism shall you use to give a meaning to this right? I can think of no better than the right to pick their government and to replace it if it is found inadequate. As it used to be called, "the right to hire and the right to fire". I.e. democracy. But, just like with the right to pursue happiness, democracy doesn't guarantee success. You've to work on it. So, when people who, while buying a car or a VCR, may spent weeks researching the marke and collecting detailed information before they reach a decision, when same people vote somebody to office based on his hairstyle, his baby kissing ability or just because he promised them goodies, then they failed to use the power given to them and they'll get the government they deserve. Here is a little story. In 1977 the Labor Party in Israel lost the elections (justly, by the way) and the right wing Likud formed a government. They didn't get a majority, mind you (no party in Israel ever does) but they got a solid 43-44 % which was enough. Anyway, they started reorganize the economy and reorganized it so "well" the within two years we had near 200% inflation. This didn't make them very popular and the antiinflationary measures they introduced even less so. Therefore, by January of 1981 their public support dropped to some 15%, and the elections were scheduled for springtime. So, they made a "bold" move. They drastically reduced taxes on color TVs (at that time the taxes on consumer electronics in Israel were extremely high, some 200%). Suddenly everybody and his uncle could buy a color TV. And, within few month their public support climbed back to above 40%, all the failures were forgotten and they won the elections again. But, that's not the end of the story. Two years later the inflation hit 1000% (yes, it is one thousand), and the economy ground to a halt, hurting badly all the proud owners of the new color TVs. So, don't you think they got what they deserved. OK, so now it is back to the saying about democracy and its "justness". What this saying says in effect is the following: In democracy people ore the sovereign. They have the ultimate right and the ultimate power, the power to chose who'll govern. But, with rights come responsibilities and obligations. Being a sovereign doesn't just mean the power to decide, it means also the obligation to live with the consequences of your decisions. And if you screwed up, you pay. Sovereignty is responsibility. In an autocratic regime people may claim that they're not responsibel for what's happening wince they had no say in it. Not so in democracy. They have the power and they have they say. So when they, in effect, abuse this power by not taking it seriously, than whose fault it is? Mati Meron | "When you argue with a fool, meron@cars.uchicago.edu | chances are he is doing just the same"
Fred McGalliardReturn to Topwrote: >Stanley Friesen wrote: >> I thought the idea of a Christian challenging a Jew about >> Jewish theology to be a little bit, umm, inappropriate. > >Dear Stan. By extension, this argument implies that it would be inappropriate for a quantum physiscist to >address a question of chemistry. This doesn't seem quite the same to me. Theology is a matter of beliefs, and it seems to me that those who actually *hold* a set of beliefs are better qualified to say what they are than somebody who holds other beliefs. Or do you really think a statement to the effect of "you really don't believe that, what you believe is .." is generally useful? The peace of God be with you. Stanley Friesen
In article <01041997174432umw@windsong.demon.co.uk>, Steve@windsong.demon.co.uk says... > >-----BEGIN PGP SIGNED MESSAGE----- > > >On Sat, 04 Jan 1997 08:45:39 GMT, in <32ce0df7.4045774@Pubnews.demon.co.uk> > savainl@pacificnet.net (Louis Savain) wrote..... > >> This is indeed the standard GR interpretation of gravity but I do >> have a major problem with the curved spacetime explanation which I >> hope Mr. Ramsey can clarify. Given that, >> >> a) Spacetime is 100% motionless, i.e., nothing moves in spacetime. >> b) Spacetime is an abstract collection of events. >> >> (Since a and b are both true, contradict at your own risk.) Note the following list of topics to *not* bring up at parties: 1. Politics 2. Religion 3. What is time? a) above is not a strictly true statement. The world line is the “history” (past, future, and present) of the motion. You jump in at any point on the t-axis and that point becomes "now". However the physical theories (especially field theories, like GR) provide equations which tell you how the system will evolve as a function of time. Still, in GR, time *is*. There is no explanation for the passage of time we all experience. To us, time flows. This flow is not explained by GR. b) above may also not be true. It depends on what you mean by "abstract". Since there are equations which define the time evolution of the system the events are in theory predictable . Folks who think about the arrow of time usually look to the second law of thermodynamics and irreversible physical processes that increase entropy. With the Wheeler-Feynman absorber theory, the boundary conditions of the universe determine the arrow of time. With the many worlds interpretation of QM, history doesn’t exist, only our record of it. Only now exists without the concept of trajectory through space-time. It is safe to say that time remains a mystery. >> Questions: >> >> 1) If a is true, how can anything have an inertial motion in >> spacetime? > >> [snip] >> say that the curved spacetime inertial path (geodesic) is the only >> explanation for the known fact that the falling objects do not "feel" >> their own accelerations. Poppycock! What is wrong with the obvious >> and simple explanation that the gravitational force is applied to >> every part of a falling object equally? To the falling object this > >You then have to explain how this mysterious action at a distance occurs, >having rejected a much simpler local mechanism. > Thank you Steve! I would add that gravity follows an inverse-square law. How exactly would Louis explain how something that varies with distance could apply a force "...to every part of a falling object equally?". --Best regards, --MikeReturn to Top
electronic monk wrote: > > > like i said before, we can think of zero having levels in the same way > that we can think of infinity as having levels. if we think of zero > only as a limit, then it will make sense. x^2 > x for all x>0, Huh? Since when is (1/2)^2 > 1/2 ????? > and then we could say 1/(x^2) > 1/x for all x>0. Huh? Since when is 1/(2^2) > 1/2 ????? >so, lim 1/(x^2) as x-->0+ > lim 1/x as x-->0+. Not so. lim x-->0+ [1/(x^2)] = +infinity (the limit does not exist. *Even if* lim x-->0- = +infinity, which it does) and lim x-->0+ (1/x) = +infinity (the limit does not exist) Remember, when we write +infinity or -infinity as an answer to a limit problem, we are really saying, "The limit does not exist." The infinity part tells us the reason *why* the limit does not exist. Of course, none of this really has anything to do with why 1/0 is undefined. What number can you multiply by 0 and get an answer of 1? Infinity? Nada. Infinity is not even a number. 'Nuff said. ____________________________________________________________ Darrell Ryan e-mail dryan@edge.net personal website http://edge.edge.net/~dryan company website http://www.edge.net/stmcReturn to Top
In article <5atcs1$hfl@miranda.gmrc.gecm.com>, rnh@gmrc.gecm.com (Richard Herring) says: > >Wavicle (wavicle@calweb.com) wrote: > >>To the best of my understanding, light does not break apart when being bent >>in a gravitational lens because the light itself is not being bent. The >>light is traveling in a straight line, and space-time is bent. Since >>space-time bends all wavelengths of light equally, no color separation >>occurs. > >>In a prism, the light chooses the path of least energy through the > ^^^^^^time > >>substance, and for different photon energies, this path is different. >>Lower energies are bent less than higher ones. As a result the light > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >or vice versa. (And it's more directly related to frequency than energy.) > There is no difference between the frequency and energy of light. They are equivalent terms describing the same attribute of light. David Smyth CPL University of QueenslandReturn to Top
-----BEGIN PGP SIGNED MESSAGE----- These articles appeared to be off-topic to the 'bot, who posts these notices as a convenience to the Usenet readers, who may choose to mark these articles as "already read". You can find the software to process these notices with some newsreaders at CancelMoose's[tm] WWW site: http://www.cm.org. Poster breakdown, culled from the From: headers, with byte counts: 1 3712 Archimedes.Plutonium@dartmouth.edu (Archimedes Plutonium) The 'bot does not e-mail these posters and is not affiliated with the several people who choose to do so. @@BEGIN NCM HEADERS Version: 0.93 Issuer: sci.physics-NoCeMbot@bwalk.dm.com Type: off-topic Newsgroup: sci.physics Action: hide Count: 1 Notice-ID: spncm1997007065459 @@BEGIN NCM BODY <5av31r$su4$1@dartvax.dartmouth.edu> sci.math sci.physics sci.logic @@END NCM BODY Feel free to e-mail the 'bot for a copy of its PGP public key or to comment on its criteria for finding off-topic articles. All e-mail will be read by humans. -----BEGIN PGP SIGNATURE----- Version: 2.6 iQCVAwUBMtNExoz0ceX+vLURAQGB8QP/TPEbCDERsUqkmbvxZ8nr5OpL5JSV4Y3U 7igb3/TOJwrJ1/FsSM7l5/DdB8dFmPMeS7tBhum/iAARia/npT72qgrSOQaGyjM2 iQrwu3ImVnmLt9N0u/kz6DnWpCHMsIbTvYMJwN8iRh78nFFmXaMFDjE0JuivqPg8 mT/RyU7zFA4= =fIvC -----END PGP SIGNATURE-----Return to Top
On Tue, 7 Jan 1997, Jack Sarfatti wrote: > Lawrence B. Crowell wrote: > > > I have never understood where the E = hbar/T comes from. > BJ: Usually one sees it as E = hv, where h is understood to be hbar (because I'm too lazy to write hbar all the time) and v is the frequency. It is, of course, directly related to the uncertainty principle, of which one common formulation is h ~ (delta E delta t). (With more apologies for the limitations of the medium.) As you no doubt realize, E = mc^2 = hv, and so we have a ready connection to relativity. > I think it is motivated by the uncertainty principle (of course there > are problems with defining a Hermitian time (and phase) operator. But it > works in perturbation theory. Bohm, Aharanov et al., have papers on it > that would be interesting to discuss when we have time. > > > I am familiar > > with quite a lot of Penrose's work and his papers are usually quite lucid, > > but I still have not seen where this formula comes from. BJ: I seem to remember that Gamow's classic *30 Years that Shook Physics* treats this business in a highly accessible way. > > > > As for Jack's back action, I have done some work to demonstrate what is a > > feedback mechanism in quantum mechanics. I need to find some time to write > > this up. It really involves the propagation of a fluctuation in a manner > > that is not Markovian. I have some more work and calculations on how > > self-referential loops can exist in this setting. To be honest this is > > all I think there really is to this business. It seems to be a reasonable > > model for quantum consciousness, yet nowhere is there any proof that > > consciousness is quantum mechanical or that this is how it is structured > > if it is quantum mechanical. My attitude on this is decidedly > > conservative. > BJ: You are right to be cautious, but it seems clear to me that you have a good nose. As to rigorous "proof", well ... that is a ways off. I believe it is fair to say that, at this pass, those of us in the quantum consciousness camp are generally proceeding by way of reasoned analogy and induction - or the odd inspiration - which is fine, for now. On the other hand, I do happen to have a simple proof which I will be happy to trot out at the slightest provocation. > There is a solid argument by Stapp that consciousness is not possible in > classical physics except as an ad hoc postulate. BJ: Right. This is old news to anyone but a physicist, but Stapp does a fine job explaining why it must be so in terms that scientists can understand. > There is a long history of connecting quantum phenomena with mind > starting with Bohr himself and with Sir James Jeans who called the > quantum wave function "mind stuff". Bohm has very convincing arguments, > some of which I have quoted in this thread on "active information". BJ: Eddington, B. Russell, Schrodinger and Wm James are also good on this point. > > Bohm clearly shows that nonlocality plus the > form-dependence/intensity-independence are desiderata for any theory of > mind. Operating from the premise of "more with less", it is clear that > one should attempt a theory in which the quantum properties of matter > are thoughtlike in a fundamental sense. I use "fundamental" the way > Chalmers does. In this, Stapp, Penrose, Herbert, Wolf, Josephson, myself > and others are all in qualitative agreement. > BJ: And high time, too. Now! We need to be a lot more clear about which "properties of matter" we wish to include in the official ontology of QM. (This is an essential point which these other guys usually shy away from because the implications are too weird.) (This is where I come in;) > Mind is right there. There is plenty of room for mind as a fundamental > physical phenomena "at the bottom". But, conscious mind is not possible > in the world of classical necessity or in the world of quantum chance. > It requires the post-quantum back-action on the edge between chance and > necessity (in Monod's sense). > BJ: So how is back-action different from regular old feedback and/or self-referentiality? > This is a pretty elegant Zen-like theory with Einstein's sense of > "naturalness" and "inner perfection" that demystifies all the nonsense > on the subject. It is science. It is testable. It makes surprising > predictions e.g. conscious superfluids given appropriate I/O sensors. It > is compatible with the idea that the Frohlich modes in microtubules are > the physical seat of the soul. It is compatible with Worden's very > interesting model on how the brain constructs internal representations > of the 3D world. BJ: After brooding over this one for some while now, I am now willing to pontificate to this extent: Perhaps a kind of Bose-Einstein condensate is at work. Possibly the microtubules do provide a fine architecture for the mind/brain. This is work for the experimentalists. > > > > Maybe, but maybe not. The earliest ideas of collapse seemed to bring an > > element of observation, or even consciousness, into the picture. This has > > caused some physicist, such as E. Wigner, to posit that quantum mechanics > > plays a role in consciousness. I state that there is no proof that QM > > plays an active role in consciousness, but there are some compelling > > reasons to think that it might. Check out Stapp's web sight for a more > > complete arguement. In effect a classical "nearest Neighbor" approach is > > not capable of giving the sort of wholeness of the integral mind the > > quantum locality appears to be capable of. BJ: Stapp's book is out, too. Now it might be that classical > > mechanics has some cards up it sleeves. After all the recent development > > in chaos theory has lead to a wide frontier in classical mechanics. It > > might be that there are other aspects of Newtonian-Hamiltonian mechanics > > that we are deaf and blind to. BJ: Somebody hold me back. > > No classical chaos theory will not do by itself. Classical chaos still > depends exclusively on form-independent/intensity-dependent forces. BJ: Not too hasty, tho' ... If > you read Bohm on "active information" you will get my point. One needs > the nonlocality and form-dependence (i.e. context-dependence) and > intensity-indendence as necessary features of mind. One also needs > back-action. In short, > nonlocality, form-dependence/intensity-independence, and back-action > form a sufficient set of physical conditions to solve the hard problem > of mind-brain theory as a purely physics problem. > BJ: No, not sufficient, but pretty good for now. > > > > Don't worry about this destroying intellectual institutions. The > > politically correct left and the patriotically correct right have made far > > greater steps in the destruction of academia. > BJ: In the end this business will transform our intellectual view of the world. > I will second that. We gallant few here on the World Wide Web are the > hope of the future. The old tenured physics farts have sold their souls > for their retirement plans. They are not the men they used to be. They > have failed to create a young generation to take their place. > BJ: Too harsh! I like to think of myself as a monster of their creation. After all, where would I be without generations of academicians offering up their treasures for my bewilderment?Return to Top
On 6 Jan 1997, Esa Sakkinen wrote: > Why light do not disperse noticeably when bending in gravitation lens? > Light is kinda white light although a little bit redshifted. > > I think I know answer but I want to get more or better information. > Could you help me? > > Esa > BJ: Wonderful question! I would bet big $ that a gravitational lense can produce chromatic aberrations. For the sake of simplicity, take a constant G: Blue light, having more energy than red light, and thus more mass, will be deflected more strongly. Someday I mean to inveigle Baez into giving a tensor representation of this phenomena - color and all. (If you listen carefully, you can hear him screaming even now.)Return to Top
cybroid@mindspring.com (Brian) wrote: >"John D. Gwinner"Return to Topwrote: >>Brian wrote in article >><32d1bc08.3611023@news.mindspring.com>... >> >>> There is a theory that a planet existed between Mars and Jupiter. This >>> planet exploded and pieces of it went everywhere and the larger pieces >>> of it became asteroids and comets. Pieces of the exploded planet could >>> easily of fallen to Earth. It may be the Mars rocks are actually >>> pieces of an exploded planet. For more info on the exploded planet >>> theory see: >>> http://www.planetarymysteries.com/vanflandern.html >> >>I thought that's quite an old theory, and no longer much in vogue. The >>current theories are that the asteroid belt was a planet that did not form >>out of planitesimals during the Solar System accretion phase, probably due >>to harmonic effects of nearby Jupiter. >Yes, it is an old theory. Van Flandern has posted about his theory on the net before. His theory is readily falsified, although he never admitted it. In particular, oxygen isotope evidence from meteorites show that they could never have been part of a single planet-sized parent body, as do the small-scale isotopic heterogenieties in CAIs from carbonaceous chondrites. Uranium dating of meteorites show that they are far older than VF's theory admits (over 4 billion years vs. a few tens of millions.) He responded to these fatal objections by vague allusions to nuclear effects from the explosion, but didn't explain what those could be -- not surprising, since general arguments show they can't work. Paul
gOn Tue, 07 Jan 1997 10:58:03 -0500 ca314159Return to Topas message <32D2728B.2A4B@bestweb.net> -- posted from: alt.atheism: [snip] >| Something to be said for the NASA like attention to detail is >|the classical managment control of quality, whereas long-term quality >|these days is useless when obsolescence rules. Look at all those >|beutifully engineered IBM XT's built to last forever; lying in the >|dumpsters. At least all those XT's and AT's make good, almost free raw material (people sometimes pay me to take them off thier hands) for all sorts of dedicated little computer projects. Erikc -- firewevr@insync.net Fundamentalism -- a disease whose symptoms include diarrhea of the mouth and constipation of the brain. Wanna see how sick some fundies are? http://www.christiangallery.com/ (home page) http://www.christiangallery.com/sick1.html#bugger (sicker than ever) /* Finest Christian porn on the 'Net */
In <5auv7h$a7u@clarknet.clark.net> prb@clark.net (pat) writes: >Yes the ground current will flow from the appliance into >drain pipe. however, a voltage gradient will be created >in the water, which will run through all submerged parts of >the victim. for instance victim standing. Now this reminds me of an interesting issue - the one about earth-leakage core-balance relays, and how they are the 'supposed' panacea of electrical safety. The standard reasoning for installing them (BTW, here in Australia they are compulsory for all new and refurbished buildings) is safety when using power tools, and satefy around wet environments. Particularly bathrooms. Now, most new buildings, especially residential buildings, use plastic piping. So, how can an ELCBR protect you in a plastic bathtub with a *plastic* drainpipe? It can't, because there is no earth through the drainpipe, so there is no earth leakage current to detect. However, the person in the water will definitely be electrocuted because the water is still forming a path from active to neutral, with the person in question immersed in this water. >a similar problem exists for sub-station workers for the >power company. a failure of high-tension in a transformer >creates gradient voltages in the soil, sufficient to kill the >workers. sub-station workers are trained to take small steps >and keep their feet together to minimze risks. I drive electric passenger trains around Sydney for a job, and I've seen some very nasty side effects of earths coming astray, etc. Our system is 1500 volt DC BTW. Regards, Craig. -- Craig Dewick. Send email to 'cdewick@lios.apana.org.au' Point a web browser at 'http://lios.apana.org.au/~cdewick/sun_ark.html' to access my collection of Sun information and links to other places.Return to Top
In article <32C79094.6BE0@physik.uni-magdeburg.de>, klaus.kassner@physik.uni-magdeburg.de says... > >Michael Ramsey wrote: >> << In article <32C4F30D.69F1@physik.uni-magdeburg.de>, << klaus.kassner@physik.uni-magdeburg.de says... <Return to Top> and into the past). These waves provide a feedback mechanism which allows >> distant matter to "push back" and resist the acceleration of matter, thus >> producing inertia. > >I don't think that this is a supportable statement. >After all, it is an *interpretation* of a theory, viz. quantum >mechanics. Which means, it is the *same* theory, not making >any predictions different from those of quantum mechanics. >And I don't believe that quantum mechanics implements >Mach's principle. It does much less so than general >relativity which has at least some Mach-like elements >(such as the Lense-Thirring effect, for example). I understand your point. Still, one of the predictions of the Transactional interpretation is ... inertia. Interesting that it also explains the two-slit result. It is consistent with the hypothesus (SR) that the photon doesn't experience time. Just about all of the quantum puzzels find a straight forward explanation without losing history (Many Worlds) or needing a brain to cause the wave function to collapse (Orthodox). Occam's razor. Still, there might be some testable predictions. The work with Quantum non-interaction measurements should shed more light on exactly what is being blocked. Maybe de Broglie-Bohm's pilot wave interpretation will win. I can't wait! --Best regards, --Mike
In article <19970107135200.IAA29323@ladder01.news.aol.com>, jmfbah@aol.com (JMFBAH) writes: >In articleReturn to Top, >meron@cars3.uchicago.edu writes: > > > , > <> But there was never a class to say why technique was important, let >alone ><>explain the ethics of decisions in choosing the data, footnoting the ><>"mistakes", keeping the data, etc. > > >[Well, Mati. I've been thinking about this and (taking the coward's way >out) waiting for someone to comment. This is an area where angels may >fear to tread and, since I'm no angel [a smiling emoticon here], I'll >tiptoe in, poking a stick in the sediment before I go on. This hesitancy >is based purely on my previous experience with certain attitudes; I have >not been able to cope with them successfully. However, these attitudes >are alarming me so here goes.....] > >Can you define truth? > Tricky. Wait till tomeorrow, I've a universe or two to create first so I prefer to leave the difficult stuff for later :-) Seriously now, I hope you don't expect me to define Truth (with capital T) the way our friends from a.p. wanted since this seems beyond anybody's ability (though some philosophers claim otherwise). But I would settle for a lower case, mundane truth, meaning just "statements which to the best of my knowledge correspond to what happened or was happening". Not a very precise definition here but I see no clear binary (that's for you, Lorenz) test which can be applied to anything and yields an answer "truth" or "not truth". There are always statements which we recognize as being (to the best of our knowledge, again) true, those we recognize as clearly false, and a hell of a lot in between. But, within the limited scope of scientific information things ase resonably clear. Regarding data "truth, the whole truth and nothing but the truth" means simply "report the data you got, all of it, and don't add fake data". Mati Meron | "When you argue with a fool, meron@cars.uchicago.edu | chances are he is doing just the same"
In article <19970107141600.JAA29660@ladder01.news.aol.com>, jmfbah@aol.com (JMFBAH) writes: >In articleReturn to Top, >meron@cars3.uchicago.edu writes: > > , > <>In article , ><> meron@cars3.uchicago.edu wrote: ><> ><> , ca314159 ><< writes: ><><>meron@cars3.uchicago.edu wrote: ><><>> ><><>> No contradiction here. You are free to select any set of >generalized ><><>> coordinates you wish (within some broad limits at least. Once >you've ><><>> selected some set then the Lagrangian will give you the conjugate ><><>> momenta (it is not the coordinates that are conjugate one to another ><><>> but the coordinates and the momenta. >>><>> ><><> Does all this stem from the fact that differential measurements ><><> are implied ? In the sense that one doesn't measure an EEG using ><><> two electrodes but instead three (or more) to obtain common ><><> mode rejection. Similarly interferometry and double slit ><><> experiments have this dualism built into them. Isn't this ><><> complementary nature of certain variables resulting from ><><> the elimination of an absolute frame of reference then ? ><> ><> <> <>
Greg d. Moore wrote: > I'd have to disagree. Let's say you and I are about to start an > interstellar war. We want to rid the galaxy of the evil Grackons. > > We set up our "binary decision device" using "separated electrons" > > At the "correct" time, I check my device. If it's flipped up, I attack > first, otherwise if it's down, you attack first. After I check mine, > you check yours which tells you the state of mine and know what to do. > > We've communicated. Granted this is a very limited communication, but > I think with some effort we could device more complex communications. > The communication is an illusion. The two photons had to have been created at some time in the past, such that they were able, at light speed, to reach the two spaceships. The outcome would be exactly the same if at the same time and place in the past, someone had flipped a coin, and sent information about the outcome by radio signal to the two ships. You would hardly call that a communication between them. In the latter scenario, the radio signal has a definite value - it represents either a heads, or a tails. Quantum mechanics tell us that the spin state of the electrons in your scenario is not defined until the measurement event. This fact, though, is not apparent from the measurements, so using the electrons no more constitutes communication than does using the radio signal. By the way - your two measurements events are, by hypothesis, super-luminally separated. It doesn't make a lot of sense to use words like "after" in such a situation, since the order of super-luminally separated events is not defined - different observers get different results. Sylvia. **** Sending me email? Note, my real email address is sylvia@zip.com.au, **** and not as specified in the header. **** I consistently approach the administrators of systems from which I **** receive junk mail.Return to Top
MARK A CLARK wrote: > > David Sepkoski (dsepkosk@earthlink.net) wrote: > : Your points are many and well taken indeed. I was brought up catholic, > : but have left the fold long ago. I too disagree with notions like papal > : infalibility and teachings about women, homosexuals, birth control, etc. > : But as you have noted, the catholic church does have a remarkable > : capacity for reasonable debate. I have many friends who are catholic > : theologians, and they have a notably more liberal view towards many of > : these contentious issues. Say what you will about the church's > : historical stance towards science--it has always been a friend of > : knowledge (at least its practitioners, if not its leadership) and the > : same cannot be said for most protestant sects. > > if the catholic church has always been a friend of knowledge (science), > then why did it destroy the ancient libraries in spain and the middle east? > merely because the muslims and christians (protestants) operated them? Do you have more details? The library of the University of Seville in the 11th century was distributed to a number of Christian locations including Bologna, and was translated into Latin. This is how much of Aristotle and Plato were rediscovered. Christian mobs of the Orthodox variety were responsible for destroying much off the Library of Alexandria in the 6th century, but they Muslims did the final coup de grace and the Romans themselves had stripped most of it. I am not familiar with any example of large scale Catholic destruction of libraries. BTW: not Catholic.Return to Top
In article <32D26565.4843@citicorp.com>, "Robert. Fung"Return to Topwrites: >meron@cars3.uchicago.edu wrote: >> >> In article <32D16582.9B4@citicorp.com>, "Robert. Fung" writes: >> >Jim Carr wrote: >> > > >> ... snip ... >> >> > > The coordinates q are chosen, the Lagrangian written in terms of >> > > q and q_dot, and then the conjugate momenta p are determined. >> > > > >> > Then it is apparent from this the dependency of p's on the q's. >> >> Not too fast. Functionally the p's and q's are independent. > Then the p's can be considered as "separate" coordinates ? > and we have some implied "dual" of space ( of the original > selection of coordinates q's) to work in which we can jump back > and forth between as you say below, with some canonical transform > like an FFT and IFFT or similar. > Yep. It is indeed dual, in some sense at least. > But they are dependent in say the Fourier/Heisenberg > uncertainty. A real "yin-yang", zero-sum game, trading with > conservation, relationship. > I would say "they are related" rather then "dependent" since the relationship is in the form of an inequality. Its like talking about (for example) the set of points forming the interior of a circle with radius R, in geometry. The coordinates x and y of such points aren't dependent in the sense of one being a function of the other but, indeed they're not fully independent since knowledge of one places some constraints on the other. > Also frequency and time being dependant, so in some sense > equivalant, but not without some entropy being paid for to > show the equivalence. > > And, the conjugate measurements sometimes seem asymmetric: > The radio engineer measures a frequency-domain spectrum of > a time-domain signal or is it ever the other way around ? > A time base is generally implied (sweep scan, reference signal > in lissajous patterns...) > For a quantum physicist, the measure of the energy quanta > has little value at radio frequencies; the field strength > is not uniquely tied to specific frequencies. > So the question is how much of the asymetry is just an "operational asymetry" in the sense that in specific regions of the parameter space one or the other may be easier to measure. Moreover, the "easier" is a purely temporary label. Hundred years ago we had primary standards for length and time and the speed of light was expressed in terms of these two, since it was easier to measure length and time. Nowadays the it became easier to measure the speed of light to high accuracy so it becamme a primary standard, while the meter became a secondary one. Mati Meron | "When you argue with a fool, meron@cars.uchicago.edu | chances are he is doing just the same"
blair@skopen.dseg.ti.com (Arthur P Blair) writes: >Can anyone recommend a good text book for undergraduate >classical mechanics? It might be out of print, but check your local university library for a copy of Marion's book (it's either "Classical Mechanics" or "Classical Dynamics"). It's excellent! -- ___________________________________________________________________ Jimmie G. McEver, III | Chairman, Student Advisory Council 638 Wood Ridge Court | Internet: gt8952a@prism.gatech.edu Atlanta, GA 30339 | Pager: (404) 833 - 1077Return to Top
On Wed, 1 Jan 1997, Kevin Brown wrote: > On 31 Dec 1996 01:06:29 -0500, "Nick Halloway"@zifi.genetics.utah.edu > wrote: > > I read a description of a special-relativity reason for the orbit of > > Mercury to precess. It was, that Mercury is moving faster when close > > to the sun, so its mass is higher, and this distorts the orbit. > > > > I'm puzzled -- when Mercury is close to the sun, it has more kinetic > > energy and thus mass-energy from that. But when Mercury is far from > > the sun, it has gravitational potential energy. This potential energy > > also has mass-energy associated with it, doesn't it?...Why then would > > there be an orbital distortion, if there's extra mass both when Mercury > > is close to the sun and when it's far away? > > This is a good - but somewhat tricky - question. The problem is to > explain how gravitational orbits would work if they were governed by > special relativity, which they aren't. If we try to treat Newtonian > gravity in the context of special relativity we find that some changes > are unavoidable. This isn't surprising, because SR requires Lorentz- > invariance whereas Newtonian gravity propagates instantaneously. So > we have to make some change in the definition of the gravitational > potential. However, there's more than one way of trying to do this, > so the result is not unique, i.e., we can't say THIS is how gravity > would work under just special relativity. There is a range of > possibilities, none of which (as it happens) agree exactly with > experiment. > > First we need to agree on what it means to treat gravitational orbits > in the context of special (not general) relativity. Presumably this > treatment will be distinct from Newtonian physics by being Lorentz- > invariant, but it will be distinct from general relativity by having > a flat spacetime. Yes, this is probably what's meant. > With those restrictions we could try to define > the gravitational potential as a scalar field, a vector field, or > a tensor field (or maybe something else?). The scalar and vector > approaches don't work out well at all. For example, neither of them > will give you any bending of light rays. > > Even focusing on just the tensor field approach, there are many > different ways of trying to make it work. The best of these theories > is described in Chapter 7 of Misner, Thorne & Wheeler, where they > propose a definition of the stress-energy tensor (including a particle > component and an interaction component) and apply this to construct > the Hamiltonian for a nearly circular orbit of a point particle. The > result is 4/3 the precession that is predicted by general relativity > (and observed in the solar system). > > The specific question was whether special relativity implies a > secular change in the effective gravitational mass of a planet in an > elliptical orbit, but of course the answer to this is very sensitive > to precisely how you define the gravitational potential, and this is > what's most is ambiguious about special-relativistic treatments of > gravity. In fact, the inability to make logical sense of gravity > in the context of special relativity was one of the main motivations > for the development of general relativity. Also, even if you suppose > that the effective gravitational mass of a planet varies with time, it > isn't clear that this would necessarily perturb its orbit, because > presumably (?) its inertial mass would always equal its gravitational > mass. If Galileo had dropped a time-varying mass from his tower, it > wouldn't have affected the time to fall. If the mass is increased, though, the planet will be moving somewhat slower than it would classically, so it would be close to the sun for longer and would tend to be pulled towards the sun ... so the perihelion would advance. > > I guess what I'm saying is that, with either special or general > relativity, the shape of the orbit of a point test particle (assumed > small enough that it doesn't significantly contribute to the overall > gravitational field) is independent of the mass of the particle, i.e., > the Equivalence Principle must apply even with special relativity, > so the shape of the orbit is determined by the "shape" of the > gravitational potential (or spacetime metric) in that region of > spacetime. Any object with a given initial position and trajectory > will follow the same path, regardless of whether its "mass" is > changing. This would be as true in special as in general relativity. > > Having said all that, could you tell me where you read the explanation > about changing mass causing orbital precession? I'm curious to see > how that could work without violating the Galileo-Einstein Equivalence > Principle. It was in "The Great Design: Particles, Fields and Creation" by Robert Adair. He says: "If we include the effects of the Special Theory of Relativity, the planet will be heavier at the perihelion than at the aphelion. It will ... change the position of the axis of the ellipse ... for Mercury, ... [there are] 43 seconds of arc unaccounted for classically. The mass increase at the perihelion, which follows from the Special Theory, accounts for 7 seconds per century; but Einstein's General Theory ... predicts 42.9 seconds per century". So ... where is the mass-energy which comes from gravitational potential energy located? -- Nick Halloway The "From:" address on this message won't work. You can reach me by e-mail; my account name is snowe, my domain name is rain.org No unsolicited bulk e-mail!Return to Top
MARK A CLARK wrote: > if the catholic church has always been a friend of knowledge (science), > then why did it destroy the ancient libraries in spain and the middle east? > merely because the muslims and christians (protestants) operated them? If you had read carefully what I posted, you'd note that I said that PRACTITIONERS of Catholocism have been friends of knowledge. The Catholic religion, like Judaism, is one based upon a continual revision and re-appraisal of its doctrine. By the way, what "ancient" libraries have the "protestants" ever run? My impression was that "protestantism" wasn't a concept until the 16th century (unless you want to count people like Wycliff, who certainly didn't live either in the middle east or Spain), which, while a long time ago, is hardly "ancient" (since you want to argue semantics). Nobody is trying to say that the Catholic church hasn't been reactionary or repressive, but Catholic scholars throughout the ages have borrowed and even acknowledged scientific and philosophical teachings from the middle east.Return to Top
timberwoof (timberwoof@themall.net) wrote: : In article <5ar34o$3sh@orm.southern.co.nz>, bsandle@southern.co.nz (Brian : Sandle) wrote: : : > I think I heard it on BBC Science Magazine about 2 years ago. They align : > with the magnetic pulse each morning. : : Again, what magnetic pulse? Do you understand enough about electricity and : magnetism to understand how a pulse like that might behave, where it might : come from, and how you might measure it? I did ask because it was new to me. Do you deny changes in radio transmission between night and day! Wouldn't that give some sort of electromagnetic hiccup? As the ionosphere changes is there any current which would effect the magnetic field? : : How do you know the whales don't just greet the sun or something? They : have got eyes, you know. I think that the program was about magnetic sensing of whales. There is some about that on the web. They do know the `magnetoscape'. It is possible to glean information from fewer dimensions, then more may be confusing if one is temporarily confusing. Think of the hard of hearing person who lip reads then is shown a language dubbed film. Brian SandleReturn to Top
Please help!!! Black holes are "black" because they can suck in light. How can light be sucked in if it moves at a constant speed???? The black hole must have "slowed it down". On its way back down to the black hole, does light or anything else travel faster than the speed of light? On more thing, if anyone knows anything about Einsteins' acceleration frame stuff..please explain!!!! Thanks, -Absolute Zer0Return to Top
In article <5ausjo$aup@sf18.dseg.ti.com>, blair@skopen.dseg.ti.com says... > >Can anyone recommend a good text book for undergraduate >classical mechanics? >Thanx, >Art. I will show my age, but the one I used was: "Fundamentals of mechanics and heat", 2nd ed., By Hugh D. Young, Pub. by McGraw-Hill Book Company It is oriented for use by physics majors as opposed to engineers. This means that a calculator did me very little good on exams as much of the focus was on deriving equations or proving equations. When I helped the engineering folks, all they had were numbers! Different worlds. --Best regards, --MikeReturn to Top
Daniel Himmel (uc4l@rzstud1.rz.uni-karlsruhe.de) wrote: > Theory of everything in einem Gesprach mit Gott. Can anybody translate it in English? Thanks DHReturn to Top
In article <852586503snz@candyman.ratcotel.net>, 4707@candyman.ratcotel.net (Alex Loh) writes: >> In articleReturn to Top, >> sam@stdavids.picker.com (Sam Goldwasser) wrote: >> >> - Probably none but lasers are not something you treat casually - any laser. >> > Could someone tell this to those who insist on bringing laser pointers > into rave events in the UK? Maybe they aren't that dangerous when waved > about rapidly, but I must confess to being worried about the things being > waved about willy-nilly by untrained and unsupervised hands. [Should I be > worried?] There was a case of two people being permanently blinded at such an event some years ago. -- Andrew Gabriel Home: Andrew@cucumber.demon.co.uk Consultant Software Engineer Work: Andrew.Gabriel@net-tel.co.uk