A girl is on a 5m swing set and I give her a push. How long do I have before she returns to me in seconds?

Apossible explanation for a set of facts that can be tested by further investigation is called

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9

Why does lightning travel from clouds to the ground?