Kepler's Laws of Planetary Motion Quiz
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Questions and Answers

According to Kepler's laws of planetary motion, which of the following statements is true about the orbit of a planet around the sun?

  • The orbit is a perfect circle
  • The orbit is a hyperbola
  • The orbit is an ellipse with the sun at one of the foci (correct)
  • The orbit is a parabola
  • According to Kepler's second law of planetary motion, which of the following statements is true about the speed of a planet as it orbits the sun?

  • The speed of the planet decreases as it gets closer to the sun
  • The speed of the planet is zero at the aphelion
  • The speed of the planet is constant throughout its orbit
  • The speed of the planet increases as it gets closer to the sun (correct)
  • According to Kepler's third law of planetary motion, which of the following statements is true about the orbital period of a planet?

  • The orbital period of a planet is directly proportional to its distance from the sun
  • The orbital period of a planet is directly proportional to the mass of the planet
  • The orbital period of a planet is inversely proportional to the square root of its distance from the sun (correct)
  • The orbital period of a planet is inversely proportional to its distance from the sun
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