Question: what is the buoyant force acting on the cylinder?
Answer: The volume of a cylinder is the area of its base multiplied by its height, or in our case: Vcylinder=A(h2−h1) V cylinder = A ( h 2 − h 1 ) . Therefore, the buoyancy force on the cylinder is: FB=mflg=Vcylinderρg=(h1−h2)ρgA F B = m fl g = V cylinder ρ g = ( h 1 − h 2 ) ρ g A .