blike Posted October 30, 2002 Share Posted October 30, 2002 Assume that I have a giant stick in space... | | | x | | | Now, lets assume I start spinning that stick clockwise around its axis in the middle. What happens when the outside edges of the stick start moving faster than light, but closer to the middle of the stick its still subliminal? Whats the effect on the geometry? [i tried to make beautiful stick diagrams out of text, but it didn't work ] Link to comment Share on other sites More sharing options...
fafalone Posted October 30, 2002 Share Posted October 30, 2002 As v -> c, m -> :inf:, so it would collapse into a singularity rather than move superluminally. Link to comment Share on other sites More sharing options...
fafalone Posted October 30, 2002 Share Posted October 30, 2002 But this leads to the question... what if your stick was a cosmic string, which would already have a density of a singularity? Link to comment Share on other sites More sharing options...
aman Posted October 30, 2002 Share Posted October 30, 2002 Since a singularity can effect space/time around it, it is hard to measure what speed it really is travelling. I imagine it would create interesting waves in our existance we might not be able to detect. Just aman Link to comment Share on other sites More sharing options...
bigjnorman Posted October 20, 2003 Share Posted October 20, 2003 is it true that if you had a pole that was a light-year long and you pushed one end of the pole toward the other end, the other end would not move until a year later? basically saying that movment in the pole would propigate at the speed of sound? I heard this on another forum but it seems that the Mach-limitation is a bit strong? (eg. the movement would propigate throught the pole at some speed faster than sound but slower than light) I assume faster than sound because of the higher density hence smaller interval in atom-atom action. Link to comment Share on other sites More sharing options...
bigjnorman Posted October 20, 2003 Share Posted October 20, 2003 crap...never mind, the argument was that the change would propigate through the pole at the speed of sound *through the pole* and the answer to my question is that the other end of the pole would recieve the motion effect instantaniously only if the material was incompressible (which is just as unlikely as mass moving faster than light) Link to comment Share on other sites More sharing options...
Dudde Posted October 21, 2003 Share Posted October 21, 2003 how the freak did you make a stick spin the speed of light in the first place? it's a stick!! Link to comment Share on other sites More sharing options...
fafalone Posted October 21, 2003 Share Posted October 21, 2003 He's referring to the speed of the center of the stick being close to the speed of light, which under incorrect thought would require the edges of the stick to be moving faster than c. This is of course neglecting that motion in a rigid body does not propagate instantaneously. Link to comment Share on other sites More sharing options...
Dudde Posted October 21, 2003 Share Posted October 21, 2003 so basically, this guy using my avatar is a communist and blike is Posting Under the Influence again Link to comment Share on other sites More sharing options...
JaKiri Posted October 21, 2003 Share Posted October 21, 2003 bigjnorman said in post #6 :crap...never mind, the argument was that the change would propigate through the pole at the speed of sound *through the pole* and the answer to my question is that the other end of the pole would recieve the motion effect instantaniously only if the material was incompressible (which is just as unlikely as mass moving faster than light) Speed of light not speed of sound. And it wouldn't move instantaneously, because the carrier particle for the force involved IS light, so it's not exactly going to go faster than itself. Link to comment Share on other sites More sharing options...
bigjnorman Posted October 21, 2003 Share Posted October 21, 2003 Originally posted by Dudde so basically, this guy using my avatar yes, because you own the trademark to spaceghost? Originally posted by MrL_JaKiri Speed of light not speed of sound. oops, he he Link to comment Share on other sites More sharing options...
NavajoEverclear Posted October 22, 2003 Share Posted October 22, 2003 what is singularity? The word implies something simple but i don't know what you guys mean. I've seen it before too, it must be important to science, but i've never learned what it means, so educate me. Please. Link to comment Share on other sites More sharing options...
alt_f13 Posted October 22, 2003 Share Posted October 22, 2003 Google it. Link to comment Share on other sites More sharing options...
JaKiri Posted October 22, 2003 Share Posted October 22, 2003 alt_f13 said in post #13 :Google it. http://www.dictionary.com it might be better. Link to comment Share on other sites More sharing options...
alt_f13 Posted October 22, 2003 Share Posted October 22, 2003 Good man. Link to comment Share on other sites More sharing options...
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