(November 20, 2011 at 9:16 pm)IATIA Wrote:(November 20, 2011 at 8:24 pm)The_Flying_Skeptic Wrote: 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.
The floating cylinder would displace 7kg (plus whatever is added to it) of water.
Nothing is added to the cylinder. The cylinder is solid. I made the mistake of saying the cylinder was a barrel in the title but it's just a solid cylinder. The cylinder is in a container full of water, and oil is added to the container. If enough oil was added to the container that cylinder gets covered by the oil...
