8.
A moon orbits a planet that has a mass of 8.44 x1028 kg. If the speed of the moon
along its orbital path is 4.27 x 104 m/s, what is the radius of its orbit?
A. 1.59 x10 m
B. 3.09 x10 m
C. 1.32 x1014 m
D. 9.53 x1018 m