1. The problem statement, all variables and given/known data http://img524.imageshack.us/img524/1743/buobu1.png [Broken] 2. Relevant equations Vsphere= pi/6(d^3) W = mg 3. The attempt at a solution Wc + Wo' = 0.650 N Wc' + Wo' = 0.550 N I'm unsure of how to do this because it asks to find the volume ONLY BY USING THE two weight measurements. The simpler way to do it would be to measure how much fluid is displaced but that's not allowed apparently so I'm stuck.