posted by annn on .
Mars has a mass of about 6.14 × 1023 kg,
and its moon Phobos has a mass of about
9.8 × 1015 kg.
If the magnitude of the gravitational force
between the two bodies is 4.18 × 1015 N,
how far apart are Mars and Phobos? The
value of the universal gravitational constant
is 6.673 × 10−11 N · m2/kg2.