Figure the weight of the steel (volume*density of steel) .
Figure the displacement of the barge, and what that displacement would weigh in water. Subtract the weight of steel, and you have left the weight of coal.
An open barge has the dimensions l=22 m, w=40 m, and h=12m. If the barge is 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 fresh water without sinking? Is there enough room in the barge to hold this amount of coal? ( the density of coal isa bout 1500 kg/m^3)
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