The equation for the force of gravitational attraction is
given by the expression G*M1*M2*/R^2, where M1 and M2 are the mass of the bodies, R is
the distance between their centers of mass and G is the universal gravitational
constant.
In the case of the spheres with radius 10 km and
20 km, which are touching each other, we would have to take the distance between them as
30 km to calculate the force of gravitational attraction. [It has been assumed here that
the mass is uniformly distributed within the spheres.]
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