What unit to we usually use to to measure a planet's orbital period? Kepler's Law

  • year
  • astronomical unit
Answer: year
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  1. 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?

  2. The orbital radius of Venus is 10.8×101010.8\times10^{10}10.8×1010 m . Its rotation period is 224.7 days. What is its orbital speed.

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  5. 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.

  6. What did Kepler discover about planets and their orbital speed?

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  11. Planets orbit the Sun in a shape called a(n)

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

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

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  15. Complete the following statement: The farther away two planets are the _______ the gravitational force between them.

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