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[Phys-L] Re: A problem of motion and derivatives



Alvin Bachman, At 03:33 PM 11/6/2005, you wrote:
/// an applied force has to propagate through
objects as a compressional wave (speed of sound ?) before a
steady state is obtained. The bottom line is that you can't
expect the simple behavior we describe in elementary
problems to withstand scrutiny in the limit of
t -> 0 .

Al Bachman


There is actually no physics model of behavior that is
not in some way simplified.
Think of gamma rays entering water: the force exchange
to Cerenkov radiation is pretty sharp edged.
A light pulse entering a water cell also gives a sound pulse.


Brian Whatcott Altus OK Eureka!
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