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An Olympic-sized swimming pool is a rectangular prism that is 50m long, 25m wide, filled with water to a depth of 1.5m. We are going to pump the water out of the pool with a pump that is 0.5 meters above the surface of the water. Compare the costs of draining the pool from the surface of the water versus draining the pool from the bottom (only consider the work done in lifting the water). Note that 1 gallon of gasoline $3 can do about 36.75 megajoules (36.75×106J) of work.
Sagot :
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