ydoaPs Posted August 19, 2004 Share Posted August 19, 2004 The equation of a circle [math](x-h)^2+(y-k)^2=r^2[/math] where (h,k) is the center and r is the radius. The equation of the circumference has no bearing on if it is or isn't a circle. When a circle spins, the circumference shortens and the radius stays the same. Is a circle, spinning near c, still a circle? Link to comment Share on other sites More sharing options...
jordan Posted August 19, 2004 Share Posted August 19, 2004 Why does the circumfrence shorten when it is spinning? Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 Why does this deserve a poll? Link to comment Share on other sites More sharing options...
ydoaPs Posted August 19, 2004 Author Share Posted August 19, 2004 relativity. i want to see what the masses think about this. do you have a problem with that? Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 i want to see what the masses think about this. do you have a problem with that? I don't see what the point of the poll is, seeing as it's not a matter of opinion, and the discussion itself is already underway. I'm not interested in whether or not you think I have a problem. Link to comment Share on other sites More sharing options...
ydoaPs Posted August 19, 2004 Author Share Posted August 19, 2004 so, what is the answer. you said it isn't a matter of opinion. Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 Yes I did, didn't I. Link to comment Share on other sites More sharing options...
ydoaPs Posted August 19, 2004 Author Share Posted August 19, 2004 you didn't answer my question. what is the answer? Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 How should I know? If I knew that, I wouldn't have been querying it in the other thread, would I? Link to comment Share on other sites More sharing options...
ydoaPs Posted August 19, 2004 Author Share Posted August 19, 2004 well, i figured you knew because of your stating it wasn't a matter of opinion. Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 well, i figured you knew because of your stating it wasn't a matter of opinion. Are you retarded or just retarded? Link to comment Share on other sites More sharing options...
ydoaPs Posted August 19, 2004 Author Share Posted August 19, 2004 a little bit of both. Link to comment Share on other sites More sharing options...
Sayonara Posted August 19, 2004 Share Posted August 19, 2004 To your credit, that's a better answer than I expected. Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted August 20, 2004 Share Posted August 20, 2004 Can't we lock this stupid thread as it is already being discussed elsewhere? Link to comment Share on other sites More sharing options...
Sayonara Posted August 20, 2004 Share Posted August 20, 2004 It no longer is being discussed elsewhere. Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted August 20, 2004 Share Posted August 20, 2004 Thank you. It hurt my eyes. Now, I don't really believe what yourdadonapogos is saying. If the circle was spinning rapidly, the radius/diameter would too, so relativity would affect it too. Just another reason... Link to comment Share on other sites More sharing options...
LucidDreamer Posted August 20, 2004 Share Posted August 20, 2004 I think we should have a poll about whether or not we should have a poll about the circle. Link to comment Share on other sites More sharing options...
Sayonara Posted August 20, 2004 Share Posted August 20, 2004 This thread needs lots of big diagrams. Link to comment Share on other sites More sharing options...
DreamLord Posted August 20, 2004 Share Posted August 20, 2004 Yeah, I really don't see how reletivity could only effect the circumference, and not the rest of the circle. Link to comment Share on other sites More sharing options...
Sayonara Posted August 20, 2004 Share Posted August 20, 2004 I'm not sure if yourdad meant to say that the circumference was actually affected, or if it just appears that way to someone in a different relatavistic frame. Link to comment Share on other sites More sharing options...
DreamLord Posted August 20, 2004 Share Posted August 20, 2004 Oh, OK. But if the circumference only apears to be effected I don't see what the problem is. Then the circumference divided by the radius would still equal pi. Link to comment Share on other sites More sharing options...
Sayonara Posted August 20, 2004 Share Posted August 20, 2004 Damn it - I spent a good few minutes hunting out this ancient thread, but its relevance is diminished somewhat by the question not ever being answered. Link to comment Share on other sites More sharing options...
ydoaPs Posted August 20, 2004 Author Share Posted August 20, 2004 ok, if a meterstick is flying at a substantial fraction of the speed of light then it isn't a meter long to the outside observers. the circle works the same way the LENGTH gets shorter in the direction of acceleration. that means even if the radius wasn't a line, it wouldn't shrink in a way that affects its length. does that answer your question? i would put some BIG diagrams on here, but i don't know how. maybe dave could reply when he gets back from his holiday. edit: the circumference is shorter, circumference divided by radius doesn't equal pie. saying they are equal would be like saying [math]3/2=1/2[/math]. Link to comment Share on other sites More sharing options...
fuhrerkeebs Posted August 20, 2004 Share Posted August 20, 2004 Oops...I meant to click yes...I don't know what I was thinking. I wouldn't think anything would change about a spinning circle, but I know a spinning disk changes... Link to comment Share on other sites More sharing options...
ydoaPs Posted August 23, 2004 Author Share Posted August 23, 2004 i have come to the conclusion that since, it would still have the same equation, it is still a circle. the definition of pi is the circumference over diameter, so i say that pi is not a constant. Link to comment Share on other sites More sharing options...
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