Question

The gravitational force F exerted by the earth on an object having a mass of 100 kg is given by the equation

F =


4,000,000



d2

where d is the distance (in km) of the object from the center of the earth, and the force F is measured in newtons (N). For what distances will the gravitational force exerted by the earth on this object be between 0.0004 N and 0.01 N?

Answer 1

This?
\[F=\frac{4,000,000}{d^2}\]
Plug in those given values for F and solve for d.

Answer 2

(or better yet, solve for d first algebraically, then plug in the values)