A custodian pushes a 119 kg box across a level floor. The box moves at a constant velocity. The custodian pushes horizontally on the box with a force of 724 Newtons, what must be the friction force experienced by the box in Newtons?

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?