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Last week brian w. suggested that a disk of the same mass and radius as
a sphere would have a greater attractive force at the center of its face
(toward the sphere on the pendulum). Rather than stick my neck out, I
pose the Sat. morn. question. (Since most of you won't read this 'till
then.)
What are the respective g fields at the surface of a sphere of radius R
and the center of a face of a disk also radius R and length 4/3 R.
(These better have the same volume, or I'm dead!)
Express in terms of rho (volume density), R, and G
bc
P.s. If you don't want to do the triple integration for the cylinder,
the formula is in the solutions book for the latest ed. of Marian.