What mass of coal can the barge carry in freshwater, Physics

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An open barge has the dimensions 22x40x12m. If the bargeis made out of 4.0-cm-thick steel plate on each of its four sides and its bottom, what mass of coal can the barge carry in freshwater without sinking? Is there enough room in the barge toehold this amount of coal? (The density of coal is about1500kg/m^3.)


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