How far apart must be a proton from a group of 8 protons (held in place next to one another) if the magnitude of the electrostatic force acting on the lone proton due to the group is equal to the magnitude of the gravitational force on the lone proton at earth's surface/

Why should seat belts not be mandatory quick plz

What is the temperature in degrees celsius of a substance with a tempature of 49k

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.