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. A 1.5 ft³ concrete weight (y = 150 lb/ft³) is connected to a thin plate as shown below, where the plate is covering an opening in the top of the tank. Determine Ah just before the plate starts to-lift off the opening. The weight of the air has a trivial effect on the manometer reading, and you may assume that the weight of the plate is also insignificant.

Fig: 1

Fig: 2