Examples of these for electrons with discrete values of angular momentum were used in the derivation of the Rydberg formula in the Bohr model of the hydrogen atom.
The "Hohmann transfer" is an example of one of these physical systems with high energy requirements. These paths are confined to a plane normal to the angular momentum vector of a system, and they occur as bounded solutions for motion in a central field when the system energy is negative. In a two- body problem they are concentric about a barycentre. Examples of these for electrons with discrete values of angular momentum were used in the derivation of the Rydberg formula in the Bohr model of the hydrogen atom. Kepler's laws describe the properties of, for 10 points, what curved paths followed by satellites about planets?
The "Hohmann transfer" is an example of one of these physical systems with high energy requirements.
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