Kelly is examining the gravitational attraction between two objects. Which best describes the effect of distance on gravitational attraction between two objects?
a.) When the distance between two masses is decreased, the gravitational attraction decreases.
b.) When the distance between two masses is increased, the gravitational attraction remains constant.
c.) When the distance between two masses is increased, the gravitational attraction decreases.
d.) When the distance between two masses is increased, the gravitational attraction increase.

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?