| 21. | :: : : It's only a mathematical impossibility in the 2-body point mass ( or rigid ball ) model.
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| 22. | Planetary motions in the Solar System can be computed with sufficient precision if they are treated as point masses.
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| 23. | It's true that the Earth is sometimes modelled as a point mass with all the mass at the center.
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| 24. | Can I use the continuum hypothesis, or can a body be considered rigid, or even as a point mass?
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| 25. | Kepler's Laws are a strict mathematical consequence of Newton's Law of Gravitation when one has only two point masses.
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| 26. | In orbital mechanics, the equations of motion of planets are formulated as point masses located at the centers of mass.
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| 27. | Similar behavior is observed for a double pendulum composed of two point masses rather than two rods with distributed mass.
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| 28. | The expression gives the gravitational potential associated to a point mass or the Coulomb potential associated to a point charge.
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| 29. | In order to complete the equations of motion, the acceleration of the point mass attached to the pendulum must be computed.
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| 30. | The solution for a two-body problem is the Kepler orbit; spheres can be treated as point masses located at their centers.
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