Sunday
May 3, 2015

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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