How far apart must two protons be if the electrical force acting on either one is equal to its weight on the earth's surface when the mass of proton is 1.7×10^-27kg

G M m / R^2 = F   force of attraction for proton

K e^2 / r^2 = F     force of attraction between 2 protons

G M m / R^2 = K e^2 / r^2

r^2 = K e^2 R^2 / (G M m)

r^2 = 9E9 * (1.6E-19)^2 * (6.37E6)^2 / (6.67E-11 * 5.98E24 * 1.7E-27)

r^2 = 9 * 2.56 * 40.6 / (6.67 * 5.98 * 1.7) * 10^-19

r^2 = 1.38 * 10^-30

r = 1.17E-15 m

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

uranium fissions/breaks up giving out energy and neutrons