Swaartekrag: Verskil tussen weergawes
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Lyn 55:
* G = Universele gravitasiekonstante (6.67x10-11 Nm<sup>2</sup>/kg<sup>2</sup>)
<math>a = \frac{v^2}{r}</math>
<math>F_G = m_a a = m_a\frac{v^2}{r}</math>
<math>F_G = G\frac{M_sm_a}{r^2}</math>
Stel (2) = (3): (Let wel: Hierdie vergelyking is [[Kepler se wette|waar]] '''slegs''' wanneer die [[wentelbaan]] van 'n planeet 'n sirkel is).
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