An ideal spring, with spring constant k, is attached to a particle of charge q and mass m in such a way that it can only move along the z-axis. the spring's equilibrium is used to set i= 0. the system is then put in an electric field e= e . 1. where would the new equilibrium be? 2. if the system was at rest and equilibrium initially, what is the maximum speed of the system after the electric field is turned on? 3. under the same conditions what is the maximum distance from the origin the mass can reach?

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?