Les satellites

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Les satellites. Les 3 lois de KEPLER. 1 re loi de KEPLER. Les trajectoires dcrites par les plantes ne sont pas des cercles, mais des ellipses. Comment tracer une ellipse ?. Caractristiques dune ellipse. F, F' : foyers de l'ellipse. Le Soleil est en F. - PowerPoint PPT Presentation

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  • Les satellites

  • Les 3 lois de KEPLER

  • 1re loi de KEPLERLes trajectoires dcrites par les plantes ne sont pas des cercles, mais des ellipses.

  • Comment tracer une ellipse ?

  • Caractristiques dune ellipse

    F, F' : foyers de l'ellipse. Le Soleil est en F. C : centre gomtrique de l'ellipse Deux grandeurs dfinissent la forme de l'ellipse: son demi-grand axe : AC = a son excentricit e = CF / a (pour la Terre, e = 0,0017 et a = 1 UA soit 149597870km)

  • 2me loi de KEPLERLes secteurs S1 et S2 dcrits par le satellite en des temps gaux ont des aires gales.

  • 3me loi de KEPLERLe carr de la priode de rvolution du satellite est proportionnel au cube du rayon de son orbite.

  • Etude du mouvement circulaire uniforme

  • Lacclration dun mouvement circulaire uniformeest centripte.

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  • 1,7 cm6,8 cm0,4 cmv2vv/2R = constante Influence de va est proportionnelle v

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