Posted by **colleen** on Saturday, August 22, 2009 at 7:50pm.

Two uniform spheres , each of mass M and radius R, touch one another. What is the magnitude of their gravitational force of attraction?

- physics -
**bobpursley**, Saturday, August 22, 2009 at 7:59pm
Isn't the distance the centers of mass are apart 2R?

- physics -
**Marth**, Saturday, August 22, 2009 at 8:05pm
Fg = G*m1*m2/r^2

And as bobpursley noted, the r (distance) is 2 * R.

Try to solve for Fg.

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