Titanomachy
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From: Rik on 29 Nov 2007 17:55 Ned wrote: > "Don Shepherd" <donshep2.nospam(a)verizon.net> wrote in message > news:QaE3j.15559$Mr.695(a)trnddc04... >>> But seriously, how fast would a singularity have to spin >>> in order for it to fly apart? >>> Ned >> 0/0 rpm. >> Don >> > > Ok, how fast would the earth have to spin for you to fly > off it (assuming you were on the equator)? What is the > escape velocity on earth - 25,000 miles per hour? So a > person on the equator moves through one circumference, > which is about 25,000 miles, in 24 hours, or about 1000 > miles per hour. So if we speeded up the earth to 25,000 > mph, or about 25 times its current rotational speed, or > about one rotation per hour, things would fly off the > equator. (Including dirt and mountains, etc. - of course, > most organic matter would burn up.) > > Hmmm... that's interesting - wiki is quite adamant that > the escape velocity of a black hole is infinite. That seems > intuitively irritating. > Surely it just needs to be slightly higher than the speed of light. Which is in turn slightly lower than the speed achieved by the average poet chasing a publishing contract. Rik, knee deep. > That's saying that no matter how fast a black hole spins, > it CAN'T break up?? No way! There has GOT to be some > rotational speed at which all the mass in a black hole > becomes unstable and begins to break up. No, stop! Don't > lecture me. Pick a number, a huge - impossibly huge - > number, say 500 billion trillion revolutions per second. > Don't tell me nothing bad would happen to the back hole > under the force of that much angular momentum! > > Ned > >
From: James Whitehead on 30 Nov 2007 02:32 "Ned" <nedludd(a)ix.netcom.com> wrote in message news:13kub73d2uh7jee(a)corp.supernews.com... > That's saying that no matter how fast a black hole spins, > it CAN'T break up?? No way! There has GOT to be some > rotational speed at which all the mass in a black hole > becomes unstable and begins to break up. No, stop! Don't > lecture me. Pick a number, a huge - impossibly huge - > number, say 500 billion trillion revolutions per second. > Don't tell me nothing bad would happen to the back hole > under the force of that much angular momentum! If it is a "hole" then its empty....
From: James Whitehead on 30 Nov 2007 02:37 "Ned" <nedludd(a)ix.netcom.com> wrote in message news:13ks6nahas71r3f(a)corp.supernews.com... > > "Don Shepherd" <donshep2.nospam(a)verizon.net> wrote in message > news:URo3j.50965$Pt.45933(a)trnddc02... >> >>> But one question... If all motion is relative, how does >>> the earth know that the moon is revolving around IT, rather >>> than IT revolving around the moon? >>> Ned >> >> What does it mean to say that the earth "knows" something? >> Don >> > > What does it mean to say that one thing goes "around" another > thing, when all motion is relative? > > Ned > >
From: Dennis M. Hammes on 30 Nov 2007 02:40 Don Shepherd wrote: > Dennis M. Hammes wrote: > >> Don Shepherd wrote: >> >>> >>> We're all bosons on this bus. >>> >>> Don >> >> >> Step to the back of the bus, then. >> You've hadron too many. >> > > Boy, you really lepton that! > > Don A leftover reflex from my days in vaudeville, when I usually got pion my face for it. -- -------(m+ ~/:o)_| Gresham's Law is not worth a Continental. http://scrawlmark.org
From: James Whitehead on 30 Nov 2007 02:41
"James Whitehead" <james(a)somewhereovertherainbow.com> wrote in message news:... > > "Ned" <nedludd(a)ix.netcom.com> wrote in message > news:13ks6nahas71r3f(a)corp.supernews.com... >> >> "Don Shepherd" <donshep2.nospam(a)verizon.net> wrote in message >> news:URo3j.50965$Pt.45933(a)trnddc02... >>> >>>> But one question... If all motion is relative, how does >>>> the earth know that the moon is revolving around IT, rather >>>> than IT revolving around the moon? >>>> Ned >>> >>> What does it mean to say that the earth "knows" something? >>> Don >>> >> >> What does it mean to say that one thing goes "around" another >> thing, when all motion is relative? >> >> Ned >> I see the sun go around... people even scientists are happy to talk about sun "rise" - it makes sense - has meaning... i thought that relativity involved relations - no "ALL" - that puts one on the outside of any relationship. |