Is There a net Gravitional Foce at the Center of the Earth?
Most recent answer: 07/30/2018
- John Gilmour (age 63)
Rest easy John, your intuition and reasoning are correct.
(published on 07/30/2018)
Follow-Up #1: where is gravity zero in Earth?
That's true. It's not necessary for the Earth to have uniform density, however, for the zero to occur at the middle. The density varies a great deal with radius, but any spherically symmetrical density will have zero field in the center. Any cylindrically symmetrical field with inversion symmetry on the axis will also have the zero at the center. Those asymmetrical anomalies you mention are real but small.
(published on 08/04/2018)