|
|
Thread Tools | Display Modes |
#21
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
So,
PD, what you are saying, is that appart from the creative banter, there's no way of proving whether you can do this with numbers ? So its just one imagination against another then ? On Aug 15, 5:18 am, PD wrote: On Aug 14, 2:11 pm, Y wrote: Oh look. If an 80m pole dosn't fit in a barn, you will need to bend it or something. Whoever suggests that the doors can close in instant keeping the pole neatly inside for that instant is crackers. If the Maths allow for it, the maths are wrong, simple as that. Actually, it's not the math that allows it, it's the laws of physics! Only thing required to do, is keep testing the math in a friendly way to ensure that this falsehood doesn't crop up. If it can be demonstrated that it does, then the math is certainly questionable. On Aug 14, 8:01 am, PD wrote: On Aug 13, 4:12 pm, Pentcho Valev wrote: On Aug 13, 9:21 pm, PD wrote: On Aug 13, 1:57 pm, Pentcho Valev wrote: On Aug 13, 6:42 pm, PD wrote: http://www.math.ucr.edu/home/baez/ph...barn_pole.html "These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn....So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. Of course, you open them again pretty quickly, but at least momentarily you had the contracted pole shut up in your barn." Bravo Clever Draper! Bulgarians are by no means addled - rather, they adore you and your answers. Just a small elaboration: "the quantitative prediction for the length of the pole in the barn frame is not 80m but 39m" but then, when the pole is safely trapped inside the barn, it will try to restore its proper length (which is 80m). Why would it do that? The doors NEVER touch the ends of the pole. If you have a fly that flies into a barn and you shut the doors of the barn, the fly continues to fly around inside the barn, and when you open the doors of the barn, the fly flies out. Why are you assuming the pole is brought to rest inside the barn? You perhaps misunderstand the barn and pole puzzle as it is commonly taught. The pole enters the barn. The doors are briefly shut, while the pole is *still* moving at constant velocity. The doors never touch the ends of the pole. Before the pole reaches the far door, the doors are opened back up. The pole continues to fly out, never having changed speed. You mean ALL THIS TIME you've been flummoxed by the barn and pole paradox BECAUSE YOU CAN'T READ??? But since the doors of the barn don't break, the pole will be able to restore only 1 meter so when Clever Draper goes and measures the length of the trapped pole, Clever Draper clearly sees a 40m long pole, perhaps a few centimetres longer if the doors are slightly deformed. Is this realistic, Clever Draper? A 40m long pole and that's it? Clever Draper, Cleverest Draper, why these zombie tricks again? Look at my initial question and you will see the phrase: "....provided your brothers have forgotten to reopen the doors of the barn "pretty quickly"...." Then your question is, is it a quantitative prediction that an 80m pole will be trapped *intact* in a 40m barn if you decide to keep the barn doors closed? The answer to that is: no, relativity makes no such prediction. If you close the doors and strike one end of a very rapidly moving pole with the barn door, then all sorts of other physics gets involved. But then Clever Draper goes to the place (he is curious this Clever Draper) and measures the length of what was once a 80m long pole but is now something trapped inside the 40m long barn. What is the maximal length of this something trapped inside the 40m long barn? 40m perhaps? Special relativity does not predict even this? No, of course not. Special relativity doesn't have anything to do with the length of a pole after it's been hit with a barn door. Why would you think it does? Any theory is closely related to its implications, even when some of them are absurd. Special relativity predicts that a 80m long object can be trapped inside a 40m long container. No, it doesn't say that, if by "trapped" you mean "brought to a stop". It says no such thing. Then the description of the state of the trapped object is special relativity's implication. Some time ago we discussed the same problem and then you said, if I am not mistaken, that the density of the trapped object can increase twice. That was special relativity's implication, although idiotic. No, that is not special relativity's implication. That is the implication of the rest of the physics that gets involved when you have a door smacking into a pole. And no, it is not idiotic. Pentcho Valev |
#22
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
|
#23
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
Or perhaps things like instants and times during don't really ammount to anything. Perhaps you might have just come full circle in representing a change in distance rather than a change in time ? In this case perhaps the length of the Pole changed from being 80m long to being 40m long, in the space of an "instant". On Aug 15, 5:24 am, "Dirk Van de moortel" dirkvandemoor...@ThankS-NO- SperM.hotmail.com wrote: Y wrote in message Or perhaps the "instant when", or better, "the time during which" the pole was inside, was extremely short. |
#24
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
On Aug 14, 9:24*pm, "Dirk Van de moortel" dirkvandemoor...@ThankS-NO-
SperM.hotmail.com wrote: Y wrote in message * Oh look. If an 80m pole dosn't fit in a barn, you will need to bend it or something. Yes, bend it, break it, or make it go very fast or something. Whoever suggests that the doors can close in instant keeping the pole neatly inside for that instant is crackers. If the Maths allow for it, the maths are wrong, simple as that. No, the maths are right by design. Perhaps the postulates from wich the math came are wrong. Clever Moortel, Cleverest Moortel, what are you talking about? Master Tom Roberts will never again say "Bravo Moortel clever zombie". Never again! Pentcho Valev |
#25
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
On Aug 14, 2:23*pm, Y wrote:
So, PD, what you are saying, is that appart from the creative banter, there's no way of proving whether you can do this with numbers ? It's not a matter of numbers. It's a matter of experiment. While the barn and pole situation has not been explicitly done, the same theory that predicts that the pole fits in the barn also predicts a number of other things that have been explicitly tested in experiment. Thus, *reality* becomes the arbiter between different imaginations, different common senses, different theories. If one theory says A will happen and B will not, and another theory says B will happen and A will not, it makes absolutely no difference whatsoever whether one theory is more eloquently argued or whether one theory is more original or whether one theory has more involved mathematics. What matters is that, when you look in nature, A appears -- and then the decision between the two theories is both simple and unarguable. PD So its just one imagination against another then ? On Aug 15, 5:18 am, PD wrote: On Aug 14, 2:11 pm, Y wrote: Oh look. If an 80m pole dosn't fit in a barn, you will need to bend it or something. Whoever suggests that the doors can close in instant keeping the pole neatly inside for that instant is crackers. If the Maths allow for it, the maths are wrong, simple as that. Actually, it's not the math that allows it, it's the laws of physics! Only thing required to do, is keep testing the math in a friendly way to ensure that this falsehood doesn't crop up. If it can be demonstrated that it does, then the math is certainly questionable. On Aug 14, 8:01 am, PD wrote: On Aug 13, 4:12 pm, Pentcho Valev wrote: On Aug 13, 9:21 pm, PD wrote: On Aug 13, 1:57 pm, Pentcho Valev wrote: On Aug 13, 6:42 pm, PD wrote: http://www.math.ucr.edu/home/baez/ph...barn_pole.html "These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn....So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch.. Of course, you open them again pretty quickly, but at least momentarily you had the contracted pole shut up in your barn." Bravo Clever Draper! Bulgarians are by no means addled - rather, they adore you and your answers. Just a small elaboration: "the quantitative prediction for the length of the pole in the barn frame is not 80m but 39m" but then, when the pole is safely trapped inside the barn, it will try to restore its proper length (which is 80m). Why would it do that? The doors NEVER touch the ends of the pole. If you have a fly that flies into a barn and you shut the doors of the barn, the fly continues to fly around inside the barn, and when you open the doors of the barn, the fly flies out. Why are you assuming the pole is brought to rest inside the barn? You perhaps misunderstand the barn and pole puzzle as it is commonly taught. The pole enters the barn. The doors are briefly shut, while the pole is *still* moving at constant velocity. The doors never touch the ends of the pole. Before the pole reaches the far door, the doors are opened back up. The pole continues to fly out, never having changed speed. You mean ALL THIS TIME you've been flummoxed by the barn and pole paradox BECAUSE YOU CAN'T READ??? But since the doors of the barn don't break, the pole will be able to restore only 1 meter so when Clever Draper goes and measures the length of the trapped pole, Clever Draper clearly sees a 40m long pole, perhaps a few centimetres longer if the doors are slightly deformed. Is this realistic, Clever Draper? A 40m long pole and that's it? Clever Draper, Cleverest Draper, why these zombie tricks again? Look at my initial question and you will see the phrase: "....provided your brothers have forgotten to reopen the doors of the barn "pretty quickly"...." Then your question is, is it a quantitative prediction that an 80m pole will be trapped *intact* in a 40m barn if you decide to keep the barn doors closed? The answer to that is: no, relativity makes no such prediction. If you close the doors and strike one end of a very rapidly moving pole with the barn door, then all sorts of other physics gets involved. But then Clever Draper goes to the place (he is curious this Clever Draper) and measures the length of what was once a 80m long pole but is now something trapped inside the 40m long barn. What is the maximal length of this something trapped inside the 40m long barn? 40m perhaps? Special relativity does not predict even this? No, of course not. Special relativity doesn't have anything to do with the length of a pole after it's been hit with a barn door. Why would you think it does? Any theory is closely related to its implications, even when some of them are absurd. Special relativity predicts that a 80m long object can be trapped inside a 40m long container. No, it doesn't say that, if by "trapped" you mean "brought to a stop". It says no such thing. Then the description of the state of the trapped object is special relativity's implication. Some time ago we discussed the same problem and then you said, if I am not mistaken, that the density of the trapped object can increase twice. That was special relativity's implication, although idiotic. No, that is not special relativity's implication. That is the implication of the rest of the physics that gets involved when you have a door smacking into a pole. And no, it is not idiotic. Pentcho Valev |
#26
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
Y wrote in message
On this forum we do not top-post. Dirk Vdm |
#27
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
Nicely said. Still seems like magic to me. On Aug 15, 5:44 am, PD wrote: On Aug 14, 2:23 pm, Y wrote: So, PD, what you are saying, is that appart from the creative banter, there's no way of proving whether you can do this with numbers ? It's not a matter of numbers. It's a matter of experiment. While the barn and pole situation has not been explicitly done, the same theory that predicts that the pole fits in the barn also predicts a number of other things that have been explicitly tested in experiment. Thus, *reality* becomes the arbiter between different imaginations, different common senses, different theories. If one theory says A will happen and B will not, and another theory says B will happen and A will not, it makes absolutely no difference whatsoever whether one theory is more eloquently argued or whether one theory is more original or whether one theory has more involved mathematics. What matters is that, when you look in nature, A appears -- and then the decision between the two theories is both simple and unarguable. PD So its just one imagination against another then ? On Aug 15, 5:18 am, PD wrote: On Aug 14, 2:11 pm, Y wrote: Oh look. If an 80m pole dosn't fit in a barn, you will need to bend it or something. Whoever suggests that the doors can close in instant keeping the pole neatly inside for that instant is crackers. If the Maths allow for it, the maths are wrong, simple as that. Actually, it's not the math that allows it, it's the laws of physics! Only thing required to do, is keep testing the math in a friendly way to ensure that this falsehood doesn't crop up. If it can be demonstrated that it does, then the math is certainly questionable. On Aug 14, 8:01 am, PD wrote: On Aug 13, 4:12 pm, Pentcho Valev wrote: On Aug 13, 9:21 pm, PD wrote: On Aug 13, 1:57 pm, Pentcho Valev wrote: On Aug 13, 6:42 pm, PD wrote: http://www.math.ucr.edu/home/baez/ph...barn_pole.html "These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn....So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. Of course, you open them again pretty quickly, but at least momentarily you had the contracted pole shut up in your barn." Bravo Clever Draper! Bulgarians are by no means addled - rather, they adore you and your answers. Just a small elaboration: "the quantitative prediction for the length of the pole in the barn frame is not 80m but 39m" but then, when the pole is safely trapped inside the barn, it will try to restore its proper length (which is 80m). Why would it do that? The doors NEVER touch the ends of the pole. If you have a fly that flies into a barn and you shut the doors of the barn, the fly continues to fly around inside the barn, and when you open the doors of the barn, the fly flies out. Why are you assuming the pole is brought to rest inside the barn? You perhaps misunderstand the barn and pole puzzle as it is commonly taught. The pole enters the barn. The doors are briefly shut, while the pole is *still* moving at constant velocity. The doors never touch the ends of the pole. Before the pole reaches the far door, the doors are opened back up. The pole continues to fly out, never having changed speed. You mean ALL THIS TIME you've been flummoxed by the barn and pole paradox BECAUSE YOU CAN'T READ??? But since the doors of the barn don't break, the pole will be able to restore only 1 meter so when Clever Draper goes and measures the length of the trapped pole, Clever Draper clearly sees a 40m long pole, perhaps a few centimetres longer if the doors are slightly deformed. Is this realistic, Clever Draper? A 40m long pole and that's it? Clever Draper, Cleverest Draper, why these zombie tricks again? Look at my initial question and you will see the phrase: "....provided your brothers have forgotten to reopen the doors of the barn "pretty quickly"...." Then your question is, is it a quantitative prediction that an 80m pole will be trapped *intact* in a 40m barn if you decide to keep the barn doors closed? The answer to that is: no, relativity makes no such prediction. If you close the doors and strike one end of a very rapidly moving pole with the barn door, then all sorts of other physics gets involved. But then Clever Draper goes to the place (he is curious this Clever Draper) and measures the length of what was once a 80m long pole but is now something trapped inside the 40m long barn. What is the maximal length of this something trapped inside the 40m long barn? 40m perhaps? Special relativity does not predict even this? No, of course not. Special relativity doesn't have anything to do with the length of a pole after it's been hit with a barn door. Why would you think it does? Any theory is closely related to its implications, even when some of them are absurd. Special relativity predicts that a 80m long object can be trapped inside a 40m long container. No, it doesn't say that, if by "trapped" you mean "brought to a stop". It says no such thing. Then the description of the state of the trapped object is special relativity's implication. Some time ago we discussed the same problem and then you said, if I am not mistaken, that the density of the trapped object can increase twice. That was special relativity's implication, although idiotic. No, that is not special relativity's implication. That is the implication of the rest of the physics that gets involved when you have a door smacking into a pole. And no, it is not idiotic. Pentcho Valev |
#28
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
On Aug 15, 5:46 am, "Dirk Van de moortel" dirkvandemoor...@ThankS-NO-
SperM.hotmail.com wrote: Y wrote in message On this forum we do not top-post. Dirk Vdm oh dear not another one of those. . . |
#29
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
|
#30
|
|||
|
|||
Quantitative Prediction of a Measurable Quantity
On Aug 14, 2:49*pm, Y wrote:
Nicely said. Still seems like magic to me. Yes, but that's what makes science an amazing field to be in. Nature often surprises us, exhibiting behavior that makes absolutely no sense to us. When this happens, it is the obligation of mankind to adjust its "common sense" to what nature really does, rather than the other way around. What science does is put together a theory that not only matches these unexpected phenomena but predicts more phenomena that can be tested. Sometimes the basic premises of these theories *still* are counter to common sense, and that's what gives them the air of magic. But if they *work* -- that is, it does match what nature does -- then we have no sound reason to doubt them. Science is not a place for the folks who long for the comfortable, the understandable, and the familiar. It is for those who relish the moments where one has to say, "Didn't see that coming!" PD |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Quantitative Drift Alignment | Rob Johnson | Amateur Astronomy | 4 | July 13th 08 09:46 PM |
quantity totally calculates Alexandra's agent | Ayman Alhadin Al Nami | Amateur Astronomy | 0 | August 15th 07 05:57 AM |
NASA has recently answered with a world press release to the prediction of a mega tsunami, created by a possible impact of a fragment of the comet SW-3 on MAY 25, 2006 in the Atlantic Ocean. This prediction, based on a clear and precise psychic commu | [email protected] | Amateur Astronomy | 12 | May 26th 06 06:50 PM |
NASA has recently answered with a world press release to the prediction of a mega tsunami, created by a possible impact of a fragment of the comet SW-3 on MAY 25, 2006 in the Atlantic Ocean. This prediction, based on a clear and precise psychic commu | [email protected] | Amateur Astronomy | 2 | May 4th 06 08:56 PM |
New prediction! | Santana | Misc | 5 | September 27th 05 08:57 PM |