/sci/ - Science & Math

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Anonymous Mon Mar 14 01:57:41 2016 No.7931168 [Reply] [Original]

Is there a way to calculate the escape velocity of a black hole? Obviously it has to be greater than or equal to the speed of light but does the formula (2GM/r)^.5 apply to black holes If so what is the radius of a black hole? is it the Schwarzschild radius (I think this is just the radius of the event horizon) or is it simply 0 seeing how their volume is 0.

>>	Anonymous Mon Mar 14 02:03:30 2016 No.7931181 >>7931168 >but does the formula (2GM/r)^.5 apply to black holes Yes, there are 2 corrections that perfectly cancel out giving the classical result.

>>	Anonymous Mon Mar 14 02:06:28 2016 No.7931184 >>7931181 So what exactly would the radius of a black hole be? As far as I understand the Schwarzschild radius is simply the radius at which Vese>c but not actually part of the black hole

>>	Anonymous Mon Mar 14 02:27:33 2016 No.7931206 Using Planck length for r & ~5SolarMasses I got Vese=10^31meters/second

>>	Anonymous Mon Mar 14 02:42:19 2016 No.7931222 >>7931184 Since you can't observe what's beyond the event horizon, it's meaningless to talk about anything within the Schwarzschild radius. It's a region of space where our current understanding of physics breaks down.

>>	Anonymous Mon Mar 14 02:44:17 2016 No.7931225 >>7931168 this made me kek, but whats wrong with the fedora, and reddit is fine

>>	Anonymous Mon Mar 14 02:50:23 2016 No.7931241 >>7931222 we can't observe a lot of things that does not mean they are meaningless to discuss.

>>	Anonymous Mon Mar 14 02:52:50 2016 No.7931244 >>7931241 The thing is, we don't know what lies inside. General relativity tells it should all collapse into a point (singularity) and God only knows what is going on there.

>>	Anonymous Mon Mar 14 02:59:14 2016 No.7931255 >>7931244 I believe the current theory is a singularity with 0 volume thus infinite density.

>>	Anonymous Mon Mar 14 03:29:30 2016 No.7931301 >>7931225 Reminder that trump supporters are edgy reddit rejects.

>>	Anonymous Mon Mar 14 03:40:29 2016 No.7931307 >>7931301 > reddit rejects AKA decent respectable people.

>>	Anonymous Mon Mar 14 03:56:45 2016 No.7931317 bernie supporters >stem, arts trump supporters >business majors, community college, "skilled trades", factory workers, basement dwellers trump btfo

>>	Anonymous Mon Mar 14 04:02:13 2016 No.7931323 >>7931317 Bernie supporters >autistic Trump supporters >closet racists Everybody's shitty anon

>>	Anonymous Mon Mar 14 09:10:21 2016 No.7931641 >>7931168 It's the speed of light retard

>>	Anonymous Mon Mar 14 09:14:26 2016 No.7931648 >>7931323 >bernie vs trump Why are my only two options an economically illiterate socialist and a proto-fascist con man?

>>	Anonymous Mon Mar 14 09:25:52 2016 No.7931659 >>7931317 Literally everyone in my engineering department supports trump because he's the only person who actually even talks about h1b abuse. This shit overwhelming affects STEM. Coalbernie would love to flood your job market with more pahjeets

>>	Anonymous Mon Mar 14 09:34:11 2016 No.7931666 >>7931659 >Literally everyone in my engineering department supports trump There is no way that's true.

>>	Anonymous Mon Mar 14 09:40:31 2016 No.7931679 >>7931659 >Literally everyone in my engineering department supports trump Meanwhile in murifat...

>>	Anonymous Mon Mar 14 09:43:54 2016 No.7931684 >>7931648 because you need to get the illusion of choice

>>	Anonymous Mon Mar 14 09:45:07 2016 No.7931685 File: 29 KB, 482x526, killyourself.jpg [View same] [iqdb] [saucenao] [google] >>7931225 >And Reddit is fine

>>	Anonymous Mon Mar 14 09:58:14 2016 No.7931710 >>7931641 >retard If that was the case, light would escape, wouldn't it, genius?

>>	Anonymous Mon Mar 14 12:12:42 2016 No.7931874 this thread got raped by Bernie fags

>>	Anonymous Mon Mar 14 12:24:25 2016 No.7931892 >>7931874 just like America

H Mon Mar 14 13:37:55 2016 No.7932012

>>7931168
By definition it's c.
When people say "black hole", they mean the region of spacetime enclosed in the event horizon (including the horizon itself).
Another way to write your formula is [math]v_{escape} = c \sqrt{\frac{R_S}{R}}[/math], where R_S is the Schwarzchild radius of the black hole, and R is your distance from the singularity. This is equal to c when your distance from the centre is equal to the radius of the black hole, and goes to infinity as you approach the singularity at the centre.
The R in your formula is the same as the R in mine - it's the distance you are away from the singularity.

>>	Anonymous Mon Mar 14 15:24:44 2016 No.7932207 >>7931710 >what is gravity fucking moron

>>	Anonymous Mon Mar 14 15:33:20 2016 No.7932237 >>7931168 >Is there a way to calculate the escape velocity of a black hole? The escape velocity/energy of a black hole inside the event horizon = infinite energy

>>	Anonymous Mon Mar 14 17:29:15 2016 No.7932500 >>7931648 They're the only ones worth discussing. All the others are Corporate %Partyname% Version 2016.

>>	Anonymous Mon Mar 14 17:30:57 2016 No.7932501 http://www.msnbc.com/msnbc-quick-cuts/watch/trump-or-sanders-description-confuses-trump-624976963567 kek

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