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Re: [Phys-l] A ball at the center of a planet

Ummmm.... trick question? Because of tidal forces, the ball is not truly a sphere at the surface of the planet. Or if the ball is a sphere at the surface, then the lack of tidal forces at the center mean it won't be a sphere there. New to this listserv, so I figured my first post ought to be something that's probably wrong. ;o)


William C. Robertson
Bill Robertson Science, Inc.
Stop Faking It! Finally Understanding Science So You Can Teach It.
Woodland Park, CO 80863

On Oct 4, 2010, at 8:43 AM, Fakhruddin, Hasan wrote:

Greetings folks!

Here is a question for your intellectual entertainment:

A solid rubber ball has a radius of r in vacuum at the surface of a planet that is a solid uniform sphere. The ball is now placed in vacuum at the center of the planet. Will the radius of the rubber ball
(a) Increase
(B) Decrease
(C) Stay the same?


~ Hasan Fakhruddin
Instructor of Physics
The Indiana Academy for Science, Mathematics, and Humanities
Ball State University
Muncie, IN 47306

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