Re: [Phys-l] Centrifugal redux

["Bob Sciamanda" <trebor@winbeam.com>]

Hi Chuck!
You should also be "MOST perplexed" by the same behavior of moving electric 
charges and their electro-magnetic fields:

Suppose I am in my car, parked outside a building containing a huge static 
electric charge (perhaps a Van de Graff dome).
If I now depress my car's gas pedal, I will encounter a magnetic field 
generated by the (now moving) electric charge.  My gas pedal action did not 
move the charge, I simply moved into a new frame in which the 
electromagnetic field of that charge has a magnetic component.

Bottom Line:  Your conundrum is not new or unique to gravi-magnetic 
phenomena.  We have long experienced it in Maxwellian electrodynamics.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
trebor@winbeam.com
http://www.winbeam.com/~trebor/

--------------------------------------------------
From: "chuck britton" <britton@ncssm.edu>
Sent: Thursday, March 19, 2009 8:57 AM
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
Subject: Re: [Phys-l] Centrifugal redux

> On Mar 18, 2009, at Mar 18(Wed) 1:54 , Bob Sciamanda wrote:
> > One interpretation might identify the agent as the distant stars.
> > When viewed, for example, from a rotating earth, the stars
> > constitute a
> > rotating mass generating  gravi-magnetic fields - resulting in
> > centrifugal/coriolis forces for the earth observers.
>
> yes, of course. It all makes so much sense.
>
> When an astro/cosmology type person put forth this explanation to me
> - I  was MOST perplexed as to how EASY it was for me to swing the
> entire universe around at pretty much whatever speed I chose.
>
> SURELY there must be some VERY strange versions of dynamics and
> energy conservation in this viewpoint.
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