Consider a cloudless day on which the sun shines down across the united states. if 2073 kj of energy reaches a square meter ( m 2 ) of the united states in one hour, how much total solar energy reaches the entire united states per hour

Could someone . i have tried to solve myself but my calculation is off

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?