Quote: Kepler's law about equal areas in equal times is the law of conservation of angular momentum when there is no torque, i.e., the force is radial

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let us apply the above results to a … Thus the rate of change of area [swept out by planet] is proportional to the angular momentum, which is constant [because the torque is zero]. So Kepler's law about equal areas in equal times is … is no torque produced by the force [i.e., when the force is radial].   Google-1   Google-2

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