Gravitational Attraction Between Two Balls

[mikejonesss]

two 6.3 kg balls with radii of .11m are in contact w/ each other. what is the gravitational attraction b/w the balls.

radius = .11m
mass = 6.3kg

Fg = G*m1*m2/ $$r^2$$

i just tried pluggging in the givens and somehow it's a trick question and i get the incorrect answer.
i shold be getting 5.47E-8.

 

[mikejonesss]

testttt,,,

 

[Hootenanny]

What is the distance between the centres of mass of the balls?

 

[mikejonesss]

hmm .11m x 2?

 

[Hootenanny]

hmm .11m x 2?

Look's good to me. If you do the arithmetic correctly, you should obtain the correct answer.

 

[mikejonesss]

yes. thank you. i also had a problem where the Fg is given and you have to find the masses. one mass is twice the other.