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. . . I do not have Fowles' book; what does
he mean by "circular orbits are stable?' Does he refer to a
potential-energy minimum (which implies a zero net force) or does he
refer to something else? . . .
. . .Ueff(R) = -G*M*m/R + m*v^2 / 2
In other words, the so-called U_effective is the sum of two energies,
kinetic and potential. But the m*v^2 / 2 term is treated as if it was
potential energy corresponding to a repulsive force of some kind. Any
comments on this? . . .