[" 1) " acm.Find the weight of 1"m" long...

[" 1) " acm.Find the weight of 1"m" long tube,if the inner diameter of the tube is "],[" How many cubic metres of earth must be dug out to sink a well of "7.8g/cm^(3)" ."],[" "and dianneter "7m" ? Also,find the cost of plastering the inner curved surface at "],[" " "]

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[" 1) " acm.Find the weight of 1"m" long tube,if the inner diameter of the tube is "],[" How many cubic metres of earth must be dug out to sink a well of "7.8g/cm^(3)" ."],[" "and dianneter "7m" ? Also,find the cost of plastering the inner curved surface at "],[" " "]

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