The mean diameters of X and Y, two planets in the same solar system, are 6.4 103

Question

The mean diameters of X and Y, two planets in the same solar system, are 6.4 103 km and 2.0 104 km, respectively. The mass of X is 0.23 times the mass of Y. The value of g on Y is 8.0 m/s2.
(a) What is the ratio of the mean density of X to that of Y (?X / ?Y)?
____

(b) What is the value of g on X?
_____m/s2

(c) The mass of Y is 1.199 1025 kg. What is the escape speed on X?
_____ m/s

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Explanation / Answer

Oops I asked this twice!!

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