In: Physics
The planet Mars has two moons: Phobos and Deimos. Phobos is in a smaller orbit (i.e. closer to Mars) than Deimos is. What does this tell us about the relative speeds and orbital periods of the two moons?
THE OPTIONS ARE:
1) Phobos is moving faster and has a larger orbital period
2.) Phobos is moving faster, Deimos has a larger orbital period
3.) Deimos is faster and has a larger orbital period
4.) Deimos is faster, Phobos has a larger orbital period
The correct option is 2.) Phobos is moving faster , Diemos has a larger orbital period
Reason : Phobos has smaller orbit therefore it will move faster and speed is inversely proportional to period therefore it's orbital period will be smaller or Diemos will have larger period..