Ekapluto is an unknown planet that has two spherical moons in circular orbits. The table summarizes the hypothetical data about the moons. Both moons have low axial spin rates. (G = 6.67 × 10-11 N ? m2/kg2)
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 acceleration due to gravity at the surface of Moon B is
A) 0.10 m/s2.
B) 0.15 m/s2.
C) 0.20 m/s2.
D) 0.25 m/s2.
E) 0.30 m/s2.
Answer: D
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