The mean distance of mars from the sun is 152 times that of, Ask an Expert

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The mean distance of Mars from the Sun is 1.52 times that of Earth from the Sun. From Kepler's law of periods, calculate the number of years required for Mars to make one revolution about the Sun.

Determine the mass of Earth from the period T and the radius r of the Moon's orbit about Earth. T = 27.3 days and r = 3.82 ? 105 km.

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