Re: Brookhaven Responds to black hole report

From: John C. Polasek (jpolasek_at_cfl.rr.com)
Date: 03/24/05 

Date: Thu, 24 Mar 2005 15:31:37 -0500

On Thu, 24 Mar 2005 04:59:27 -0700, GR_GR <nyb@colorado.edu> wrote:

>John C. Polasek wrote:
>> On Wed, 23 Mar 2005 09:25:29 -0800, Uncle Al <UncleAl0@hate.spam.net>
>> wrote:
>>
>>
>>>Mark Martin wrote:
>>>
>>>>Uncle Al wrote:
>>>>
>>>>
snip
>>>Calculate the average acceleration of a 125 grain .357 Magnum
>>>semijacketed hollow point bullet as it starts from rest and passes
>>>down a 6" S&W barrel to exit at 1450 ft/sec. It is a rather large
>>>number. The large /_\v of particle collisions given the short times
>>>puts out some impressive acceleration numbers. To say that this is a
>>>gravitational black hole is dancing on thin ice. Commercial
>>>ultracentrifuges can generate more than one million gees continuous,
>>>but there is no associated time dilation at the rim - by direct
>>>measurement (Mossbauer resonance with the hub).
>>>
>>>If the Earth had a surface gravity of one million gees its escape
>>>velocity would be 7000 miles/second - not relativistic.
>>
>> I get 219 mi/s. Its radius would be 1/1000th of R_w.
>>
>>
>> Mr. Dual Space
>>
>> If you have something to say, write an equation.
>> If you have nothing to say, write an essay
>
>I guess you had nothing to say, since you had no equation to back up
>what you were saying.
>
>escape velocity -> v = Sqrt[(2 G M)/r)]
>
>F = (G m M)/r^2 -> r g = (G M)/r
>
>v = Sqrt[2 r g]
>
>v = Sqrt[2 ( 9.8 m/s^2)(1000000)] = 1.1E7 m/s ~ 7000 mi/s

Yup, looks like you forgot to put in r in 2rg.

It's 219 mi/s alright.
For 1 million gee, use .001R:
V = sqrt(2MG/.001R) = 3.5x10^5m/s = 219 mi/s.
Have you tried checking the units?

>Yup, looks like Al was right.

No it looks like Al was wrong.

>You have a bug up your arse, Mr. Dual Space. Shut the hell up if you
>have nothing to say.

It looks like your expostulations are unwarranted.

Mr. Dual Space

If you have something to say, write an equation.
If you have nothing to say, write an essay

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