A plate of negligible weight closes a 1 ft diameter hole in a tank containing ai

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A plate of negligible weight closes a 1 ft diameter hole in a tank containing air and water as shown. A block of concrete (specific weight 1 150 lbf/ft^3), having a volume of 1.5 ft^3, is suspended from the plate and is completely immersed in the water. As the air pressure is increased, the differential reading, h, on the inclined-tube mercury manometer increases. Determine h just before the plate starts to lift off the hole. The weight of the air has a negligible effect on the manometer reading.

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