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

They probably did give their instructors ulcers. I wonder if that is a pre-condition for wanting to get your Phd in Physics.

:-)

_________________________

Joel Rauber, Ph.D
Department of Physics
South Dakota State University
Brookings, SD 57007
Joel.Rauber@sdstate.edu
605.688.5428 (w)
605.688.5878 (fax)

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Fakhruddin, Hasan
Sent: Monday, October 04, 2010 12:32 PM
To: Forum for Physics Educators
Subject: [Phys-l] Clarification: A ball at the center of a planet

Alright folks, Here is a little modification:

A solid elastic rubber ball is a perfect sphere of radius r in free
space. A solid homogeneous spherical massive run away planet also in
free space has a spherical cavity formed at its center. The cavity is
much larger than the ball and has vacuum in it. The ball is now
transported to the center of the planet. Its radius now is
(A) > r
(B) < r
(C) = r

(now come on....don't ask me to define free space)

How did you guys ever take any exam without giving your instructor
ulcers?!

'Burp'....excuse me; I just took Alka-Seltzer!

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