A. Explain the purpose of non-watertight longitudinal subdivision of tanks. b) A box -barge 30 m long and 9 m beam floats at a draught of 3 m. The centre of gravity lies on the centreline and KG is 3.50 m. A mass of 10 tonne, which is already on board, is now moved 6m across the ship. i) Estimate the angle to which the vessel will heel, using the formula GZ=sin θ(GM+1/2BM tan2 θ) ii) Compare the above result with the angle of heel obtained by the metacentric formula.

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