Haha I just caught up with this thread .. you are spot on Bill S :-)

Perhaps I can recommend Preearth to look at a couple of youtube videos

http://www.youtube.com/watch?v=AcQMoZr_x7Q
http://www.youtube.com/watch?v=-lt8i7cb_o8

You can even buy the toys which might help him.

Again the usual comment if Preearth was a scientist not a mathematician he would read the background

=> http://en.wikipedia.org/wiki/Slosh_dynamics

Quote:

Another example is problematic interaction with the spacecraft Attitude Control System (ACS), especially for spinning satellites[8] which can suffer resonance between slosh and nutation, or adverse changes to the rotational inertia. Because of these types of risk, in the 1960s the National Aeronautics and Space Administration (NASA) extensively studied[9] liquid slosh in spacecraft tanks, and in the 1990s NASA undertook the Middeck 0-Gravity Dynamics Experiment[10] on the space shuttle. The European Space Agency has advanced these investigations[11][12][13][14] with the launch of SLOSHSAT. Most spinning spacecraft since 1980 have been tested at the Applied Dynamics Laboratories drop tower using sub-scale models.[15] Extensive contributions have also been made[16] by the Southwest Research Institute, but research is widespread[17] in academia and industry.


What would happen with the liquid core or earth is well known.


Last edited by Orac; 11/08/12 09:43 AM.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.