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A closed tank is filled with water and has a 4-ft-diameterhemispherical dome, as shown in Fig.P2.10.18. A U-tube manometer is connected to the tank. Determine the vertical force of the water on the dome if the differential manometer reading is 7 ft and the air pressure at the upper end of the manometer is 12.6 psi.

Fig: 1

Fig: 2