Homework Help: Physics

Posted by Sam on Thursday, December 1, 2011 at 10:35pm.

1.Two balls, each with a mass of 0.871 kg,
exert a gravitational force of 8.23 × 10−11 N
on each other.
How far apart are the balls? The value
of the universal gravitational constant is
6.673 × 10−11 Nm2/kg2.
Answer in units of m
I got .785 which is correct.

002 10.0 points
Mars has a mass of about 6.56 × 1023 kg,
and its moon Phobos has a mass of about
9.2 × 1015 kg.
If the magnitude of the gravitational force
between the two bodies is 4.68 × 1015 N,
how far apart are Mars and Phobos? The
value of the universal gravitational constant
is 6.673 × 10−11 N · m2/kg2.
Answer in units of m

Don't get this.

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