So how much delay is there in a hydraulic system? My intuition is telling me
it is faster that a sonar signal.
John Ferrell
http://DixieNC.US

----- Original Message -----
From: "William Chops Westfield" <westfw@MAC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, June 25, 2004 8:38 PM
Subject: Re: [OT] : Challenging...(another thought)


> On Jun 25, 2004, at 7:07 AM, Russell McMahon wrote:
>
> > 2.    Look at waves hitting a beach or ripples hitting the edge of a
> > pool
> > etc. If the wave front is slightly off square, watch what happens to
> > the
> > contact point as the wave hits the edge or shore. Whiel nothing on the
> > wave
> > moves faster than wave speed, the contact point is related to the
> > arctan of
> > the contact angle. For very small angles, the contact point can travel
> > at
> > speeds of 100's of kilometres per hour when the wave is travelling
> > under 10
> > kph. Nothing physical is actually moving this fast but the motion can
> > be
> > very clearly observed.
>
>
> There's a similar phenomena for EM/etc; either the 'group velocity' or
> 'phase velocity' of the waveform corresponding to something like a
> fundamental packet;  (IIRC, it goes something like this.  A particle is
> like a wave, right?  but you apply forier analysis to get something
> that looks like the discontinuous waveform of a particle, and the
> individual frequencies involved have to have propagation velocities
> faster than C.
> Unfortunately, you can do anything useful with those parts...)
>
> BillW
>
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