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Q8. (a) Explain why the draught of a ship decreases when it passes from fresh water to seawater and vice versa. (6)
(b) A lock gate which is 15m wide has salt water on one side to a depth of 8m and fresh water on the other side to a depth of 9m. Find the resultant thrust on the lock gate and state on which side of the gate it acts. (10)
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