All of these are examples of electrochemical cells used in our daily lives. Which involve voltaic electrochemical cells? Check all that apply. a cell that powers a flashlight a cell used to make gold-plated jewelry a cell that charges your cell phone battery a cell used to electrically split aluminum oxide into aluminum metal a cell that powers a TV remote control

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?