Q. Neptune has a mass 17.20 times larger than that of Earth and a radius 3.88 times larger. A person weighing 140 lb on the Earth would weigh how much on Neptune?
Q. Two identical positive charges exert a repulsive force of 6.40 x 10-9 N when separated by a distance of 3.80 x 10 -10 m. estimate the charge of each.