In Gulliver's Travels, Jonathan Swift wrote about a country where astronomers had found that Mars had two moons. (The moons of Mars were unknown at that time)
"They have likewise discovered two lesser stars, or satellites, which revolve about Mars, whereof the innermost is distant from the center of the primary planet exactly three of his diameters, and the outermost five; the former revolves in the space of ten hours, and the latter in twenty-one and a half..." If this information were correct, what would the mass of Mars be? The radius of Mars is 3,393,500 m and G = 6.67 x 10-11 N•m2/kg2. A) 3.86 × 1024 kg
B) 6.45 × 1023 kg
C) 5.67 × 1021 kg
D) 2.83 × 1021 kg
E) 4.78 × 1020 kg
A
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Fill in the blank(s) with the appropriate word(s).
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A. the temperature in its core B. its mass C. its luminosity D. the pressure in its core E. All of these choices are correct.