An elevator does 81, 00 elevator J work to lift group of people 15 meters up to the 4th floor of a building. Determine the combined mass of the people in the elevator.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

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?

As the distance from a magnet increases, what happens to the magnet force?