a.) For letter a, we use the law of universal gravitation using the constant G = 6.674×10−11 m3⋅kg−1⋅s−2
Grav. F = G*m1*m2*(1/d^2)
m1 is mass of electron = 9.11 × 10-31 kg
m2 is mass of proton = 1.67 × 10-27 kg
d = 4.5 nm = 4.5 x 10^-9 m
Grav F = 5.01 x 10^-51 N
b.) For letter b, we use the Coulomb's using the constant k = 9×10^9 N
Electric force = k*Q1*Q2*(1/d^2)
Q1 is charge of electron = -1.6 × 10-19 C
Q2 is charge of proton = +1.6 × 10-19 C
Electric force = 1.14 x 10^-11 N
