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-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Mallinckrodt
Sent: Friday, November 24, 2006 6:07 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Weightless (running around in circles)
On Nov 24, 2006, at 2:31 PM, Jeffrey Schnick wrote:
Suppose I established a coordinate system and took some position
vs. time measurements on the object that has the accelerometer
attached to it. Further suppose that, from that data, I determined
the acceleration of the object, call it r double dot, relative to
the established coordinate system.
O.K. so far.
I understand r double dot to be the what NIST calls "the local
acceleration of free fall in that reference frame."
? I sure don't follow that. I would agree with you if the object
actually WAS in free fall, but I didn't see that specified. Maybe
you simply forgot to say so?
Is the NIST definition of weight just how hard and which way Idot?
would have to
push on the object to make its accelerometer reading be r double
Assuming the object was in free fall when you measured r double dot,
I think that's right.
John Mallinckrodt
Professor of Physics, Cal Poly Pomona
<http://www.csupomona.edu/~ajm>
and
Lead Guitarist, Out-Laws of Physics
<http://outlawsofphysics.com>
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