Gravitational force,

$\overline{)\begin{array}{rcl}{\mathbf{F}}& {\mathbf{=}}& \mathbf{G}\frac{{\mathbf{m}}_{\mathbf{1}}{\mathbf{m}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}\end{array}}$

m_{1} = m_{2} = M

Two uniform spheres, each with mass M and radius R, touch one another. What is the magnitude of their gravitational force of attraction? Express your answer in terms of the variables M, R, and appropriate constants.

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