ANSWER:
3.82 x 10^-9 N
STEP-BY-STEP EXPLANATION:
Given:
Mass 1 (m1) = Mass 2 (m2) = 2.8 kg
Distance (d) = 0.37 m
According to Newton's laws of gravitation, the attractive force is given by the following expression:
[tex]\begin{gathered} F=G\cdot\frac{m_1\cdot m_2}{d^2} \\ \\ G=6.67\cdot10⁻¹¹\text{ N*m^^b2/kg^^b2} \\ \\ \text{ We replacing:} \\ \\ F=6.67\cdot\:10^{-11}\cdot\frac{2.8\cdot2.8}{0.37^2} \\ \\ F=3.82\cdot10^{-9}N \end{gathered}[/tex]The magnitude of the gravitational attraction between the books is 3.82 x 10^-9 N