At a distance of 100 km from a small, electrically charged asteroid, it is found
that there is an electric field of 300 V/m. How much charge does the asteroid
carry?

E = K Q / R^2         electric field due to charge Q

Q = E * R^2 / K = 300 N / C * (10^5)^2 m^2 / (9.0E9 nt-m^2/C^2)

Q = 333 C

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

a electromagnetic waves