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From: Rama <R...@Live.In>
Newsgroups: sci.physics,sci.physics.relativity
Subject: Re: Instantaneous speed of gravity
Date: Sat, 19 May 2012 13:54:17 -0700 (PDT)
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On May 19, 3:40=A0pm, "Androcles" <M...@May.2012> wrote:
> "Rama" <R...@Live.In> wrote in message
>
> news:49979183-9979-4a37-974a-b76e231653a9@l5g2000pbo.googlegroups.com...
> On May 19, 2:37 pm, "Androcles" <M...@May.2012> wrote:
>
>
>
>
>
> > "Rama" <R...@Live.In> wrote in message
>
> >news:5e02bd0f-1863-4f32-a20b-7f2ead5296f7@n5g2000pbg.googlegroups.com...
> > On May 19, 2:22 pm, "Androcles" <M...@May.2012> wrote:
>
> > > "Rama" <R...@Live.In> wrote in message
>
> > >news:df98e433-501f-4b2d-81b2-872958ad1d02@kw17g2000pbb.googlegroups.co=
m...>
> > > Stationary helicopter in air. Neo hanging in air with 1 km long rope.
> > > > One end of rope attached to helicopter and other end in hands of ne=
o.
> > > > Suppose speed of compression waves in rope is 100 m/s. If rope at
> > > > helicopter end is cut, will neo hang in air for 10 seconds without =
any
> > > > support?
>
> > > > If length of rope is x meter and speed of compression waves in
> > > > medium(rope) is y m/s then will object hang in air for x/y seconds?
>
> > > > If yes, why gravity wait for compression waves to travel within rop=
e?
> > > > How does gravity communicate with compression waves?
>
> > > Why you call stretch "compression"?
> > > Stretch pull, compression push.
> > > Neo not push helicopter up.
>
> > What do you mean?
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > Not if yes. Gravity not wait. Gravity not communicate. Gravity not give=
 a
> > shit.
> > You idiot.
>
> Does that mean neo will start falling at EXACTLY same moment rope at
> helicopter end is cut? Information across rope travels instantaneously?
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Rope at helicopter end start falling at EXACTLY same moment rope at
> helicopter end is cut, Neo start falling at EXACTLY same moment,
> rope not compresses.

So as neo starts falling at EXACTLY same moment the rope at helicopter
end is cut and as length of rope between helicopter end and neo is 1
km hence info about rope cut at helicopter end travels across rope to
neo instantaneously. But FTL info travel is not allowed.

What do you say?