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Re: Lecture Notes



At 22:07 29 06 2000 , Paul wrote:

Jim,

I imagine this oceanography professor didn't learn or doesn't remember that
scientists should always avoid ambiguous language. I even know some
physicists who are not always careful to speak and write clearly and
unambiguously.

This chap was obviously thinking about the Earth-moon system revolving about
its CM and forgot that both bodies also rotate. His statements are loosely
correct for such a system.

Go easy on him.

Paul O. Johnson

Well actually, Paul, this is a lady professor -- and I don't think that she
is as nearly correct as you give her credit for: She seems to be asserting
that all the particles in the Earth are moving about the Earth/Moon cm _in
the same orbit_ and (assuming the same mass for each particle I take it)
have the same force acting on them. Now it is true that I am old and
senile, but that can't possibly be correct -- even if the bodies don't spin
on their own axes, Did I miss something here?

And, Paul, I am always nice to ladies, but this one needs help -- or _I_
do. <g>

Jim

Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen