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The mean diameters of planets A and B are 7.9 × 103 km and 1.0 ×...

The mean diameters of planets A and B are 7.9 × 103 km and 1.0 × 104 km, respectively. The ratio of the mass of planet A to that of planet B is 0.47. (a) What is the ratio of the mean density of A to that of B? (b) What is the ratio of the gravitational acceleration on A to that on B? (c) What is the ratio of escape speed on A to that on B?

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