QUESTION 1a Lightning Flash
A lightning flash may transfer up to 18 C of charge through a potential difference of 107 V
How much energy does this involve?

QUESTION 1b
A lighting flash may transfer up to 15C of charge through a potential difference of 10^7 v
For how long in minutes does this energy light a 75 W bulb?

PLEASE PLEASE HELP ME

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

What is the single most important equation in all of physics?