13.2 Gravitational force between point masses

13.2.1—That, for a point outside a uniform sphere, the mass of the sphere may be

13.2.2—Newton’s law of gravitation F = Gm1m2 / r2 for the force between two point

13.2.3—Circular orbits in gravitational fields by relating the gravitational force

13.2.4—A satellite in a geostationary orbit remains at the same point above the

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13.2 Gravitational force between point masses