Circle.

[ydoaPs]

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?

[jordan]

Why does the circumfrence shorten when it is spinning?

[Sayonara]

Why does this deserve a poll?

[ydoaPs]

relativity.

 

i want to see what the masses think about this. do you have a problem with that?

[Sayonara]

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.

[ydoaPs]

so, what is the answer. you said it isn't a matter of opinion.

[Sayonara]

Yes I did, didn't I.

[ydoaPs]

you didn't answer my question. what is the answer?

[Sayonara]

How should I know? If I knew that, I wouldn't have been querying it in the other thread, would I?

[ydoaPs]

well, i figured you knew because of your stating it wasn't a matter of opinion.

[Sayonara]

well, i figured you knew because of your stating it wasn't a matter of opinion.

Are you retarded or just retarded?

[ydoaPs]

a little bit of both.

[Sayonara]

To your credit, that's a better answer than I expected.

[Cap'n Refsmmat]

Can't we lock this stupid thread as it is already being discussed elsewhere?

[Sayonara]

It no longer is being discussed elsewhere.

[Cap'n Refsmmat]

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...

[LucidDreamer]

I think we should have a poll about whether or not we should have a poll about the circle.

[Sayonara]

This thread needs lots of big diagrams.

[DreamLord]

Yeah, I really don't see how reletivity could only effect the circumference, and not the rest of the circle.

[Sayonara]

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.

[DreamLord]

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.

[Sayonara]

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.

[ydoaPs]

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].

[fuhrerkeebs]

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...

[ydoaPs]

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.