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Q1) A ship’s double bottom tank is divided by an oiltight centre girder to form equal port and starboard tanks.

The tanks are 16 m long and have a constant plan area defined by equidistant ordinates from the centre girder to the sides of the ship of:

5.5, 5.0, 4.3, 3.5 and 2.5 metres.

At a displacement of 11164 tonne in sea water of density 1025 kg/m³, the centre of gravity  is 5.733 m above the keel and both tanks are partially full of oil having a density of 900 kg/m³ to a depth of 0.75 m remains constant.

Calculate the change in effective metacentric height. (16)