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From: John Park on 22 Apr 2010 16:41
PD (thedraperfamily(a)gmail.com) writes:
> On Apr 21, 9:35=A0pm, xxein <xx...(a)comcast.net> wrote:
>> On Apr 21, 5:25=A0pm, PD <thedraperfam...(a)gmail.com> wrote:
>>
>> > On Apr 21, 4:19=A0pm, PD <thedraperfam...(a)gmail.com> wrote:
>>
>> > > On Apr 21, 3:57=A0pm, BURT <macromi...(a)yahoo.com> wrote:
>>
>> > > > > > GR says matter falls at the speed of light.
PD:
>> > > > > No, it does not. Nowhere does it say that. Things crossing the ev=
> ent
>> > > > > horizon can do so at quite low speeds.
>>

[...]>>
>> >> > You're not as competent as Kip Thorn. He declared what GR says. And
>> > > > that is objects fall at the speed of light at the event horizon.
>>
[...]
>>
>> xxein: =A0I really hate to back Burt up but (2*G*m/r)^.5 is the escape
>> velocity for the horizon of a black hole. =A0m expressed in light terms
>> becomes M and then (2*M*c^2/r)^.5 becomes the escape velocity from
>> within a black hole. =A02M is the event horizon in case you have
>> forgotten or can't handle the math transposition.

PD:
>
> Escape velocity is not the speed at which things fall into a black
> hole. Likewise, the escape velocity at the Earth's surface is not the
> speed at which things will fall to the Earth's surface, either.

I think the last statement needs a bit of amplification.

--John Park

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