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Mathematics 9 Online
OpenStudy (anonymous):

the cylindrical tank shown below is to be filled by pumping water from a lake 15 ft below the bottom of the tank. one way is to attach a hose to the rim of the tank and let the water pour in. the other is to pump water through a hose attached to a valve at the bottom of the tank. which will require less work? (tank dimensions; 6ft high with a radius of 2 ft)

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