30. Equilibrium of forces (on the ﬂoating body) is expressed as F b = m body g = ⇒ ρ liquid gV submerged = ρ body gV total which leads to V submerged V total = ρ body ρ liquid . We are told (indirectly) that two-thirds of the body is below the surface, so the fraction above is 2 / 3. Thus, with ρ
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