BALLOON PROBLEM. please please help :) 1. The problem statement, all variables and given/known data I need to find the volume of a helium balloon, and 9 paperclips can sit on it so it doesn't float away (.004kg). Density of He=.18; density of air=1.29; mass of balloon=.0116kg. 2. Relevant equations Free body sum of equations: Fy=Fb-W(He)+W(balloon)+(Wpaperclip)=0 3. The attempt at a solution using the equation above, I first isolated Fb, then I got: Fb=(.18)(vHe)+(.0116)(g)+(.004)(g) Fb=p(fluid)v(disp)g=(.18)(vHe)+(.0116)(g)+(.004)(g) I don't know if this is right. And i don't understand if you solve for Vhe or Vdisp because aren't they the same things.