Inverse Square Laws

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Gravity, electrostatic force, and luminosity are inversely proportional to the square of the distance. This Demonstration gives an idea of why: an area projected from the center of a sphere grows proportionately to the square of the distance.
Contributed by: Enrique Zeleny V. (March 2011)
Open content licensed under CC BY-NC-SA
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"Inverse Square Laws"
http://demonstrations.wolfram.com/InverseSquareLaws/
Wolfram Demonstrations Project
Published: March 7 2011