The force, F, acting on a charged object varies inversely to the square of its distance, d, from another charged object. When the two objects are 0.65 meters apart, the force acting on
them is 5.2 Newtons. Approximately, how much force would the object feel if it is at a
distance of 0.5 meters apart?

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?