I have two questions that I wanna make sure I'm doing correctly and understanding. The first question is how close will two protons get to each other if they are traveling at a velocity v towards each other. I figured you can set up 1/2mv^2 = kq1q2/r and solve for r..is that correct? The second q i'm not really sure about..I actually drew a picture which was given to me.. Basically you have the following pipe where the area on the top is twice the area on the bottom..The question asks what should h equal in order for the pressure in both pipes to be the same.. I'm guessing that the area on top will be .5V1 (using A1V1=A2V2)..then do we use Bernoilli's principle to solve for h?