A vertical cylindrical tank has an orifice for its outlet. When the water surface in the tank is 5.0 m above the orifice, the surface can be lowered 4.0 m in 20 minutes, the pressure on the surface being atmospheric. What uniform air pressure must be applied on the surface if the same volume of water is to be lowered in 10 minutes? 60 cm 0 W.S. orifice anchor

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