Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons.
Mass Radius Orbital Radius Orbital period
Moon A 4.0 1020 kg 2.0 108 m 4.0 106 s
Moon B 1.5 1020 kg 2.0 105 m 3.0 108 m
The orbital period of Moon B is closest to
A) 5.6 106 s.
B) 6.0 106 s.
C) 6.4 106 s.
D) 6.9 106 s.
E) 7.3 106 s.
Question 2
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 d
B) 40 d
C) 80 d
D) 160 d
E) 320 d