Give three examples of objects that have gravitational potential energy

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

An object in mechanical equilibrium is an object