Chapter 12.7, Problem 1QCE

Let G denote the universal gravitational constant and let M and m denote masses a distance $r$ apart.

(a) According to Newton’s Law of Universal Gravitation, M and m attract each other with a force of magnitude $\text{\_\_\_\_\_\_}\text{.}$

(b) If r is the radius vector from M to m. then the force of attraction the mass M exerts on mass m is $\text{\_\_\_\_\_\_\_\_}\text{.}$