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Q5. (a) State why cargo ships must have a collision bulkhead. (6)
(b) A bilge holding tank of 5m length. 3m width and 1.8m depth has water of density 1.020 t/m3 upto a sounding of 1.3m and oil of density 0.86 t/m³ is floating on top of water up to an ullage of 0.3m. Calculate the mass of water and oil in the tank. (10)