1. The equations describing the gravitational field are isomorphic to those describing the electric field with the following substitutions:
   • (1 / (4 π ε)) → - G
   • q → m

   (G = 6.674 * 10^-11 N m² / kg²)

2. The surface gravity of a body is

   g = G M / R²,

   where M is its mass and R is its radius.

   The escape velocity V of a body is determined by

   m V² / 2 = G m M / R.

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©2012, Kenneth R. Koehler. All Rights Reserved. This document may be freely reproduced provided that this copyright notice is included.