Re: pinhole moon / earth interaction

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Wed Mar 24 2004 - 11:49:11 PST 

From: "Paul Doherty" <pauld@exploratorium.edu>
Subject: Re: pinhole moon / earth interaction
Date: Wed, 24 Mar 2004 11:49:11 -0800
Message-ID: <web-200046@exploratorium.edu>

Hi Peter

Lunar gravity tugs on the surface of the earth with a
force raising a tidal bulge. However the force creates an
acceleration of the surface of the earth, which creates a
velocity, which creates a displacement, So there is a time
delay between when the bulge is pulled on and when it
reaches its maximum height.

The rotation of the earth caries the tidal bulge forward
of the earth moon line during this time delay. The bulge
is actually a little in front of the moon and so pulls it
forward adding to its orbital energy and raising its
orbit.

Paul D

On Wed, 24 Mar 2004 11:33:22 -0500
  "peter rust" <mroxidation@hotmail.com> wrote:
>
>hi pinholers,
>
>i have a question that has been bothering me for a while
>regarding the earth and the moon. I can see how the
>Earth's spin is slowing due to friction with the tidal
>bulge... i think. The issue I have is how that is
>related to the moon getting further away from the Earth
>each year. Where does the moon get this extra energy? I
>get the idea of conservation of angular momentum... which
>is how it is explained in some books... but i don't get
>it what is the method of energy transfer from the Earth
>to the moon... help
>
>peter
>
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