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Re: [Phys-L] conserved momentum thru gas...

Thank you for the response.

To try and be more clear:

how is the atmosphere keeping up with the rotational velocity of the
spinning earth? This would neccesarily mean the same angular velocity but a
greater linear velocity at, say 100km above solid earth. Again though,
that's assuming the earth/atmosphere 'system' is 1 frame of reference (not
2 separate).

My goto was gravity as well, but this answer had some weaknesses (to me),
so: I asked here : )


On Sun., Dec. 18, 2022, 7:45 a.m. Prof. Keith S. Taber via Phys-l, <> wrote:

On 17/12/2022 21:42, O A via Phys-l wrote:
How is conservation of momentum 'transferring' through scores of miles of

Not sure I fully understand the question, but the molecules collide,
which does not change the total momentum. Yet, there is another factor
to consider. Gravity. This provides the centripetal force acting on the
molecules so that there is an interaction to transfer momentum and
change their velocity.

Is that what you were thinking?



“Experience teaches us that we cannot fully comprehend any one of
nature’s works: and those philosophers who in a disciplinable way search
into nature…after they have written large volumes of some very slender
subject ever find that they have left untouched an endless abyss of
knowledge for whomsoever shall please to build upon their foundations;
and that they can never arrive near saying all that may be said of that
subject, though they have said never so much of it”

Dr. Keith S. Taber

Emeritus Professor of Science Education
University of Cambridge

Senior Member
Homerton College, Cambridge

Some recent postings include

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