If a planet's surface were covered by liquid then ( in the absence of tides ) the liquid would assume a shape such that the local apparent gravity vector ( true gravity vector-centripetal force vector ) was everywhere perpendicular to its surface-this shape is a geoid.
12.
If a planet's surface were covered by liquid then ( in the absence of tides ) the liquid would assume a shape such that the local apparent gravity vector ( true gravity vector-centripetal force vector ) was everywhere perpendicular to its surface-this shape is a geoid.
13.
Many years ago Tom Digby pointed out that the number could easily be tripled if the added sats have ion engines ( which provide a weak thrust steadily for years ) pointed parallel to the axis; the thrust added to the gravity vector shifts the orbital plane enough to provide a few degrees of spacing . & mdash; Tamfang 05 : 02, 24 June 2007 ( UTC)
14.
This would cause the Earth to collapse inward on itself into a black hole, leaving only those people behind who don't insist on using the pt-mass model when it isn't applicable, LOL . An accurate model would find the gravity vector between the person at the center of the Earth and each atom in the Earth, using the distance to each atom to determine the strength.
