A solid cylinder (radius 0.150m height 0.120m) has a mass of 7 kg. The cylinder is floating on water, but oil (r=875kg/m^3) is added to the container, the cylinder gets covered by the oil. What % of the cylinder is above water?
I think that that 100% of the solid cylinder is floating above water because the cylinder is less dense than the water and the oil. density_cylinder = (mass_cylinder) / (pi*(radius^2)*h) = (7) / (pi*(0.15^2)(0.120) = 825.248kg/m^3
However, I can't believe the problem is that easy. I must be doing something wrong.
I've talked to about 4 other people about this problem. I even talked to a chemistry professor at my college and he agrees that 100% of the cylinder is above the water. I just talked to a physics tutor about this problem and he too agreed that the cylinder is above the water and floating on top of the oil. I still think this problem is too easy.