A pumps lifts water from a lake to a large tank 20 m 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 1000 kg.
The work done by pump against gravity
"W=mgh\\\\\n=\\rm 5.0*1000\\:kg*9.8\\: N\/kg*20\\: m=9.8*10^5\\: J"
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