you know any good paradox from physics or math???
155155
Yes. Do a Google search for Zeno's paradox.
902708
Try \n1. http://en.wikipedia.org/wiki/Eccentricity_%28mathematics%29\n\n2. http://mathworld.wolfram.com/Eccentricity.html
533021
there are some solved physics problems on \nhttp://www.dctech.com/physics/help/\nbut I don't know if it will help you out.
384756
Yup, relativity and qunatum mechanics work together nicely.  You'll need to account for the switch to using spacetime quantities instead of space and time quantities, and the fundemental equations get kind of hairy, but they still work out fine.
1109075
Einstein's law of gravitation. It certainly looks nicer than Newton's :P
1082808
mathematical dilemma. there is no answer to the question. Well at least none that are known. Just like the elements we know there out there but we have to figure them out first.  just like Einstein theory of fusion. its passable just not proved.
528801
Quite the paradox, isn't it?
978585
You can go to http://en.wikipedia.org/wiki/Main_Page to look up different scientific theories like theory of relativity http://en.wikipedia.org/wiki/Theory_of_relativity or Newton's Laws on Motion http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion\n\nGood Luck!!!
698194
The time paradox is that brought about by one individual moving at near the speed of light through space and having the relative time value of their physical existence being less than that of a person not moving at near the same speed.\n\nThe reason this exists is due to mass acceleration causing the frequency of energy at right angles of travel becoming less, and this same energy being transferred to direction of travel.  As energy has less potential at right angles of travel, time becomes condensed in one direction.  At the speed of light time would cease to exist because it all would be in one direction only.\n\nTime requires mass to exist.  It requires three dimensions.  When two of these dimensions cease to exist, time ceases to exist.\n\nLastly, were you to consider the physics trilogy, E = mc2, m = E/c2, and c2 = E/m you would note that the only constant value of these equations is that of c2.  This is what physical time is.  It is physical time.  Physical time is the basis of these three equations and it is what we are composed of.  It is for this reason that all physical existence moves from the present to the past at exactly the same rate.\n\nThere is no shortcut through physical time.  It is impossible for mankind to form any manner of time travel due to all events having ever occured, or shall occur, existing only in present time.
507606
contradictions r not possible.
468986
Ah, the wonders of proving reality to a disbeliever!\nFirst, I want you to visit http://en.wikipedia.org/wiki/Introduction_to_special_relativity , and try to teach yourself whatever they're talking about, okay? \nNext, I know this is unprovable, but I have my own distinct thoughts and imaginations and feelings and beliefs, and if nothing else, can assure you that I am, in fact, quite real.\nFind that page yet? Good. Do you understand the math? If so, kudos, go on to the main Special Relativity or General Relativity pages. If not, do you see where I'm heading with this?\nThis world we live in, grass and garbage and math and all, is much too complex for you to dream! The human mind is capable of miraculous things - but it can hardly invent hundreds of thousands of sciences and religions and people, and keep them all straight, and create histories and backgrounds and politics for each.
700795
physics ?\n- jindajind ?
695134
Isn't that a paradox?
79420
Hey babygurlgonnaloveonu you have asked what is totally QUESTION NUMBER ONE in physics. It's an exciting question which many teachers secretly don't understand and so their students get this hazy idea and kind of go thru the motions. \n\nWow, it is so basic, that it took a super-genius, I mean way smarter than Einstein, to figure it out. A good old farm boy, astrologer, magician & alchemist, religious fanatic, mathematician and all around kook. Yep. Sir Isaac Newton. You gotta wonder what kind of parents would name their kid "Sir"\n\nWell we all know what a force is, it is a sort of push or pull -- think of it as something that changes or *tries to change* the motion of stuff.\n\nNewton first figured out that if you leave a thing alone, or if the pushes and pulls on it cancel out, then it will sit there like a lump. Like those drivers wearing hats, and like sit there after the light has already turned green two minutes ago. \n\nOr else a thing  will keep moving in the same straight line direction and speed  like those drivers wearing hats who go 40 mph on the expressway with their turn signal blinking on and on. This is known as "THE HAT LAW".\n\nAll was well until he noticed that things move faster in an amount equal to how much you bully them or push them around. Twice the force, twice the fasterness and fasterness (also known as acceleration). This is called the "YOU BIG BULLY LAW".\n\nThen he discovered a fly in the ointment. His HAT and BULLY laws didn't really explain all that much. Something was gumming up this beautiful theory. We call it MASS and it is still an unknown mystery as to what it really is. So we vaguely call it the amount of stuff or matter in a thing. \n\nSo he found out that for a certain force the faster-isity (acceleration) is cut in half if you double the mass. The bully has to push twice as hard to fasterize two little kids. So he was like "I'll just add that in, and all will be cool". The "YOU BIG BULLY LAW" and "THE HAT LAW" totally did it all. Wa ta da babee!\n\nBut then Newton had a road accident. He was gunning his Harley over London bridge at like 250 when a bug  hit him in the mouth and knocked out one of his wooden teeth. He was all "Why am I so in pain?". And the bug as it squooshed said "Help! I'm a bug!"\n\nSo spitting out the splinters of his wooden tooth and the splattered bug, he had this revelation. He realized that because he was moving so fast, and the  bug slowed down so fast, that even a eentsy mass like a bug was like taking a hammer to his tooth. \n\nHe noticed that the force was equal to the mass of the bug times the speed of impact all happening in a brief moment. Since Newton spoke Latin (he  was the love child of Joe Newton and an Italian governess) he wrote "Fastus buggus ina momentum hurtus like crazy." Today we call this "momentum". It is just "mass times speed" or "force times a small moment of time". \n\nAnd he realized that the bug smashed up his tooth, but also that the bug was squashed (like a bug) because they were trading the EXACT same amount of momentum. The force on the tooth by the bug in the moment of time was PRECISELY equal to the  smacko-ing the tooth used to stop the bug dead. \n\nHe said "Hey, like he broke my tooth, but I killed him soooo dead!" He did the math and found that the force of the bug on the tooth was equal to the force of the tooth on the bug! \n\nNo way did the two equal forces cancel, after all, his tooth was hammered to splinters, and the bug was flattened. They were equal and opposite, but since one was on the tooth, and the other force was on the bug they did serious damage! Today we call this the "HELP I'M A BUG" law.\n\nNow our man 'Zack was all set. He wrote down his three laws:\n\nTHE HAT LAW (beeep! beeep! Move it Hat Guy!)\nTHE YOU BIG BULLY LAW (betcha can't kno
830585
Y'know, I've been trying to get a handle on that for a long time, but so far I understand it to mean that post-Einstein, once you  include time as a fourth axis to the 3 spatial ones, the universe makes sense in terms of our physical laws working everywhere and everytime.  That is a neccessity of a good physical law - it must always work no matter where in the universe you test it or how fast you're travelling.  In other words, translations and rotations of objects or fields or whatever must have no effect on the validity of the law.  If you do not include time as an axis perpendicular to the 3 spatial ones (mathematically, of couse), what we predict won't agree with what we see, especially in such cases as high relative velocities (as in approacing the speed of light), and strong gravitational fields.  Amoung the oddest result of this view is that, in truth, all time actually exists simultaneously, and there is some not-quite-understood mechanism that only lets us see one instant at a time.\n\nAnyway, to answer your question, "How does spacetime work?", the answer is, much better than space or time alone and separate.  They are, in fact, as inseparable as the pair of poles of a magnet.\n\nThis all might be not quite accurate, especially since I'm so far just an "armchair physicist" with no formal education in the area, (tho I'm looking forward to taking physics, including the higher levels, if I can ever get thru these friggin' calculus classes).  Anybody else have something to contribute or set me straight on??
913177
Yes there are, and the best (imho) explanations in plain, non-technical language are in a book by Richard Feynmann titled  "QED The strange theory of light and matter".\nWhen you first read what actually happens when light bounces off a mirror it's mind blowing. There are equally good explanations of why a simple lens works, etc.
114656
It's not necessarily impossible according to theory, but given our current technology, it's out of the question.  There's a lot of trouble with time travel theory, including multiple paradoxes.\n\nThe most famous paradox is, of course, the grandfather paradox.  It goes something like this: One day, after you've built your time machine, you decide to travel back into the past to shoot your grandfather before your father is born.  Here is the major paradox, if you suceed in killing your grandfather, you couldn't be born to go back and shoot him.  Just as well, the conditions required for you to shoot him couldn't exist and thus he lives.\n\nStill on the 'travel back in time to shoot grandpa' string, several other things could happen as well.  You could be transported to an alternate timeline, similar to ours, but not ours, and whatever you do there doesn't affect anything in our time line.  You could go back and try and kill your grandfather, but you are thwarted in every attempt, which tends to imply some sort of destiny or grand scheme.  You could try to go back in time but are ripped to shreds because every fragment of your being wants to be in its natural time.  There's a million and one other things that could happen.\n\nThat, I believe, is not necessarily answering your question, though.  Time itself is not understood by physicists even now.  What it is, no one is quite sure!  (However, I'm fairly certain time is related somehow to mass.)  One thing that's always for certain is time moves forward in a very linear fashion, cause followed by effect otherwise called casaulity.  I can't say one way or another why exactly we can't go back in time and I won't say it's not possible, some theories say it is.\n\nHowever, I believe Stephen Hawking offered up the best proof against time travel to date: Wouldn't there be time tourists from the future visiting us if time travel was feasible?