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

From: John Mallinckrodt <ajm@csupomona.edu>
Date: Mon, 4 Oct 2010 11:21:29 -0700

Hasan Fakhruddin wrote:

I believe the radius will decrease due to the planets pull on the particles of the ball, directed toward the center of the planet.
So Choice C.

I assume you mean "B," but the planet doesn't exert any force whatsoever on the ball (at least under Newtonian gravity) so the reasoning here is clearly wrong.

John Mallinckrodt
Cal Poly Pomona

Follow-Ups:
- Re: [Phys-l] Clarification: A ball at the center of a planet
  - From: "Fakhruddin, Hasan" <hfakhrud@bsu.edu>

References:
- [Phys-l] A ball at the center of a planet
  - From: "Fakhruddin, Hasan" <hfakhrud@bsu.edu>
- Re: [Phys-l] A ball at the center of a planet
  - From: chuck britton <cvbritton@mac.com>
- [Phys-l] Clarification: A ball at the center of a planet
  - From: "Fakhruddin, Hasan" <hfakhrud@bsu.edu>
- Re: [Phys-l] Clarification: A ball at the center of a planet
  - From: "Fakhruddin, Hasan" <hfakhrud@bsu.edu>

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