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A glass tube of cross sectional area 1.3 × 10 4m2 is partially filled with water. An oil with a density of 810 kg ms is slowly with the water and floats on top of it. The height of the oil above the waters surface is l 1 cn. oned into the tube so that does not mi (a) By how much does the pressure change at a depth of 14 cm below the waters surface after the oil s added? Number Units (b) Would the pressure at this depth increase or decrease if you added more oil to the tube? O decrease increase
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