Kepler's first law states that the orbits of the planets are oval in shape or Kepler's Law

  • ellipses
  • perfect circles
Answer: ellipses
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  1. The speed at which any planet moves through space is constantly changing. In a perfectly circular orbit, the orbital radius of the planet would be constant and therefore so would be its observed angular velocity. In elliptical orbits, the velocity varies. In elliptical orbits, the orbital radius of the satellite will vary and therefore so will its velocity. The planet travels "faster" when closer to the Sun, then "slower" at a more distant radius. According to Newton's 2nd Law, what is the underlying force behind this change in velocity?

  2. Kepler’s first law states that planets travel in a(n) orbit.

  3. The planets in our solar system all have ______________ orbits.

  4. Planets travel around the sun in __ orbits

  5. Planets revolve around the sun in elliptical orbits

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  7. Planets orbit the sun in a shape called an ellipse.

  8. When a planet orbits the Sun, one of the foci of the elliptical orbit is

  9. The place where a planet is closest to the Sun as it orbits the Sun is called the

  10. When Earth orbits around the sun, it slows down when it is close to the sun. It speeds up its orbit when it is further from the sun. This is because the sun's gravity is stronger when you are closer to it.

  11. Where will an object move at the greatest speed as it orbits the sun?

  12. Earth's orbital radius is 1.5 x 10^11 m and it orbits the Sun in 1 year. If Mercury's orbital radius is 5.79 x 10^10 m, calculate the time taken for it to orbit the Sun.Radius orbit Bumi ialah 1.5 x 10^11 m dan Bumi mengelilingi Matahari dalam tempoh 1 tahun. Jika radius orbit Utarid ialah 5.79 x 10^10 m, kira masa yang diambil untuk mengorbit Matahari.

  13. __ have some of the most elliptical orbits in our solar system

  14. The distance of venus and Saturn from the sun are nearly 101110^{11^{ }}1011 m and 101210^{12}1012 m respectively. Assuming that they move in circular orbits, their periodic times would be in ratio of

  15. Kepler’s 3rd law states the square of the orbital period is proportional to the cube of the orbital radius. (T2=r3)If a planet's orbital radius is doubled, what happens to the length of a year on that planet?

  16. Consider the model of Kepler's 2nd Law. Each colored wedge represents the same time interval. Kepler states that the area of each wedge must be equal. According to this, what conclusions can you draw about the movement of any planet?

  17. Kepler’s third law states

  18. Earth and the other planets closest to the Sun are made mostly of _______

  19. When do planets move the fastest?

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