pump delivers 11000 lb/hr of water from an elevation 30 ft below the pump to an elevation 50 ft above the pump through various diameter pipes. at the lower elevation, the water is 60 f and 10 psia and the flow area is 0.0233 ft^2. at the higher elevation, the water is at 80 psia and the flow area is 0.0060 ft^2. the pump and pipes are insulated. determine the minimum pump power required