Ekapluto is an unknown planet that has two moons in circular ...

[sammy]

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

[kescobar@64]

Answer to Question 1

E

Answer to Question 2

D

[sammy]

Excellent

[brbarasa]

Gracias!