A tank of depth 4 ft is full of liquid of density 50 lb per cubic ft. The horizontal cross section of the tank at depth y ft below the liquid surface has area (40 –– 3y) square ft. Find out the work done to pump all the liquid out of the tank. Answer: ft-lb. (Enter an integer)

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A tank of depth 4 ft is full of liquid of density 50 lb per cubic ft. The horizontal cross section of the
tank at depth y ft below the liquid surface has area (40 – 3y) square ft.
Find out the work done to pump all the liquid out of the tank.
Answer:
ft-lb.
(Enter an integer)
Transcribed Image Text:A tank of depth 4 ft is full of liquid of density 50 lb per cubic ft. The horizontal cross section of the tank at depth y ft below the liquid surface has area (40 – 3y) square ft. Find out the work done to pump all the liquid out of the tank. Answer: ft-lb. (Enter an integer)
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