If the distance between two objects is decreased to one fourth of the original distance how will the decrease change the force of attraction between the objects

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

As the distance from a magnet increases, what happens to the magnet force?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m