Environmental science, please help

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

mass and volume are the answers you are looking for

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach