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#61
08-23-2007, 12:09 PM
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Re: The Information Paradox of Black Holes
[ QUOTE ]
[ QUOTE ] [ QUOTE ] [ QUOTE ] yes; in the absence of non-conservative forces, you do indeed get "perpetual motion". That's why the moon doesn't crash into the earth. [/ QUOTE ]Actually the moon is receding from the Earth, not spiralling closer in. [/ QUOTE ] If that is true (and I have no idea), how does that support the idea of perpetual motion, and how does perpetual motion imply that the moon won't collide with the earth? [/ QUOTE ] [/ QUOTE ] The motion of a point mass under a Newtonian central gravitational potential is a *closed orbit*. That's "perpetual motion". That's what I was refering to. In the real world objects have extent and there are other objects in the universe, so orbits can change over time. Stop being a supernit. I can just see the response from the kids when I grade their tests like you would: "Q. At what radius does the moon orbit the Earth?" "A. 385,000 km" "<font color="red">X I'm sorry; you didn't take into account tidal forces, the center of mass of the Earth-Moon system, or the gravitational perturbations of the rest of the solar system, galaxy, and universe, nor did you provide a solution for the rest of time."</font> 
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#62
08-23-2007, 05:20 PM
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Re: The Information Paradox of Black Holes
"EFF YOO"?
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#64
08-23-2007, 09:38 PM
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Re: The Information Paradox of Black Holes
[ QUOTE ]
[ QUOTE ] Stop being a supernit. [/ QUOTE ] Stop being presumptuous. If you didn't want to get into detail, then you shouldn't have provided any in the first place. [/ QUOTE ] Dude, he asked a question about what would happen in a highly idealized situation, i.e. you drill a [censored] hole through the Earth and assume the Earth isn't rotating. I think we can cleary neglect tidal forces and the Big [censored] Bang.
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#65
08-24-2007, 02:25 AM
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Re: The Information Paradox of Black Holes
[ QUOTE ]
Dude, he asked a question about what would happen in a highly idealized situation, i.e. you drill a [censored] hole through the Earth and assume the Earth isn't rotating. I think we can cleary neglect tidal forces and the Big [censored] Bang. [/ QUOTE ] Borodog does have a point here.
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