The centers of a 15 kg lead ball and a 90 g lead ball are separated by 11 cm. part a what gravitational force does each exert on the other?

The gravitational force between the two objects is calculated through the equation,

      F = Gm₁m₂/d²

where F is the gravitational force, G is constant (equal to 6.67 x 10^-11), m₁ and m₂ are masses in kg and d is distance is meters. 

Substituting the known values,

    F = (6.67 x 10^-11)(15 kg)(0.090 kg)/ (0.11 m)²

    F = 7.441 x 10^-9 N

ANSWER: 7.441 x 10^-9 N