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



But of course I can get out of this one by using other's arguments that
Force is a theoretical, abstract concept, therefore the fact that it is
calculated with an abstract instantaneous velocity is OK! ;-)

[Besides, any measurement of the force will involve a finite time interval.]

Rick

----- Original Message -----
From: "Bob Sciamanda" <trebor@WINBEAM.COM>
To: <PHYS-L@LISTS.NAU.EDU>
Sent: Thursday, November 03, 2005 2:35 PM
Subject: Re: A problem of motion and derivatives


Rick argued:
| the instantaneous quantities (the derivatives) are abstract and (at
least)
| operationally are not 'real'. . . .

What does the velocity dependent Lorentz force "measure" as "V" in
F=Q(VxB) - a finite change in position, an average velocity, an
instantaneous velocity, or what?

Bob Sciamanda
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