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13 February, 12:25

The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to

Earth? s Moon. Their orbital radii are 9,378 km and 23,459 km respectively. What is the ratio of the

orbital speed, v, of Phobos to that of Deimos?

A) 1.582 B) 3.956 C) 0.3998 D) 0.2528 E) 2.858

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Answers (1)
  1. 13 February, 13:27
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    Answer:D - 0.2528

    Explanation:

    T = (Rp/Rd) ^3/2

    T = (9378/23459) ^3/2

    T=0.2528

    The answer is D
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