[SOLVED] Electrostatics Problem I've been trying to solve this problem for the longest time, but it doesn't seem to give enough information. 1. The problem statement, all variables and given/known data If an alpha particle is fired straight at a nucleus of a gold atom, (q = 79 e) at a velocity of 3.3 x 10^4 m/s, how close will it get to the gold nucleus? mass of alpha particle = 6.64 x 10^27 kg e = 1.6 x 10^-19 C (I looked this up on the internet, it's not given in the question, but: charge on alpha particle = +2e) 2. Relevant equations I have v1 and v2 (I'm assuming it's zero), but that's pretty much it. I can't calculate the force between these charges because I don't know their distance. I also tried: W = Delta Ek W = (0.5)(m)(v)^2 W = (0.5)(6.64x10^-27)(3.3x10^4)^2 W = 3.62x10^-18 J F * d = 3.62x10^-18 But, as I said, I can't calculate the force, and the "d" in that formula gives me the distance it traveled, not how close it got to the nucleus. 3. The attempt at a solution I'd really like to post an attempt, to show that I truly tried this problem, but I'm really stumped. I have thought of using the electrostatic force equation, but that didn't work out. I'm really not sure where to start. Could someone please tell me the general direction I should go? I don't need an actual answer, I just want some guidance. Thanks.