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Re: momentum



Jack,
I will add further that this is a correct transformation for the
Galiean system (this is nonrelativistic). Being in collider physics, I
know that relativistically the lab frame and center of momentum (or mass
depending on level of correctness you want) do not have the same energy
available. (I deal with the transformations daily in my research.)
Luckily, our cars do not travel nearly as fast as would be required to
invoke the rel. transofrmations.


Sam Held

-----Original Message-----
From: JACK L. URETSKY (C)1998; HEP DIVISION, ARGONNE NATIONAL LAB
ARGONNE, IL 60439 [mailto:JLU@HEP.ANL.GOV]
Sent: Thursday, July 01, 1999 1:05 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: Re: momentum


Hi Henry-
Sorry, but what is the wrong physics that you had in mind?
The statement seems to me to be correct in the approximation that
hitting a car is equivalent to hitting a tree.
***********************************************
In the Cover Story of the Wed 30 June 99 USA Today, Edward Moeller, a
traffic engineer is quoted, "If you are driving 35 and hit someone
coming
at you at 35, it's the equivilent of hitting a tree at 70."

Any hope of correcting this WRONG PHYSICS?
*******************
Regards,
Jack

"I scored the next great triumph for science myself,
to wit, how the milk gets into the cow. Both of us
had marveled over that mystery a long time. We had
followed the cows around for years - that is, in the
daytime - but had never caught them drinking fluid of
that color."
Mark Twain, Extract from Eve's
Autobiography