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Two Moons Orbit a Planet in Nearly Circular Orbits

Question 28

Multiple Choice

Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?


A) 20 days
B) 40 days
C) 80 days
D) 160 days
E) 320 days

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