A raft is constructed of wood having a density of 600.0 kg/m3. The area of its top surface is 5.7 m2, and its volume is 0.50 m3. When the raft is placed in fresh water having a density of 1.0x10^3 kg/m3, how much of it is below water level? What is the upward acceleration of a helium filled balloon of volume 0.0230 m3 if the mass of the balloon's shell is 0.005 kg? (The density of air is 1.20 kg/m3 and that of helium is 0.177 kg/m3. I keep getting the 1st question wrong, I only have one try. I tried Fb=volumexgxdensity Then weight=mg=densityxvolumex9.8 Then I did w/fbx100= % then did h=volume/area then hx% I keep getting it wrong, please help.