06-05-2006, 09:28 PM
The point you make is valid until you realise the average of all the atoms of Earth is it's center. And there, the gravitational attraction there is infinite.
If someone was to drill a giant hole directly through the planet that went directly over the center of mass, and you dropped a ball down the hole, it would (with SHM) modulate until it lost all it's energy, and 'hover' directly on the center of mass (obviously assuming it isn't affected by the rest of the universe).
If someone was to drill a giant hole directly through the planet that went directly over the center of mass, and you dropped a ball down the hole, it would (with SHM) modulate until it lost all it's energy, and 'hover' directly on the center of mass (obviously assuming it isn't affected by the rest of the universe).
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