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A polythene rod of length 0.5 m floats upright in a water tank. (i) Given that the densities of polythene rod and water are

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A polythene rod of length 0.5 m floats upright in a water tank. (i) Given that the densities of polythene rod and water are 920 and 1000 kg/m3 respectively, what is the length of the rod immersed in water? (5 marks) (ii) If the rod floats in another liquid with 0.4 m of its length under the liquid surface, what is the density of the liquid? (5 marks)

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