Determine the intensity of the gravitational force exerted by a sphere of radius \(R=15 \mathrm{~cm}\) and \(M=158 \mathrm{~kg}\) and one of radius \(r=3 \mathrm{~cm}\) with mass \(m=0.73 \mathrm{~kg}\) whose surfaces are \(5 \mathrm{~cm}\) apart