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

  • physics -

    Isn't the distance the centers of mass are apart 2R?

  • physics -

    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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