The speed of sound in air on a certain stormy day is about 1130 feet per second. you see a flash of lightning striking some distance away, and four seconds later you hear the clap of thunder. how many miles away did the lightning strike?

What type of nuclear decay causes the atomic number of an element to increase by 1?

Who was the first scientist to measure speed as distance over time?

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?