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The planet Mars has two moons, phobos and
delmos. (1) phobos has a period 7 hours, 39
minutes and an orbital radius of 9.4 × 10 km .
Calculate the mass of mars. (ii) Assume that earth
and mars move in circular orbits around the sun. with
the martian orbit being 1: 52 times the orbital radius
of the earth. What is the length of the martian year in
days?

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