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A pump lifts water from a lake to a large tank 20m above the lake. How much work against gravity does the pump do as it transfers 5.0m^3 of water to the tank? One cubic meter of water has a mass of 1000kg.

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GLORYCELCERVANTESIN

Answer:

980 kJ

Work= change in energy

W= mgh

W= (1000 kg/m³ x 5.0m³) (9.8 m/s²) (20m)

W= 980,000 J

W= 980 kJ

The pump does 980 kJ of work

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