A schoolyard teeter-totter with a total length of 6.3 m and a mass of 41 kg is pivoted at tis center. A 18 kg child sits on one end of the teeter-totter. 1.) Where should a parent push vertically downward with a force of 220 N in order to hold the teeter-totter to level?
x1= m from center

2.)Where should the parent push with a force of 320 N?
x2=m from the center

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?