February 20, 2017

Homework Help: Physics

Posted by Ethan on Wednesday, January 12, 2011 at 9:18pm.

A unit of area often used in measuring land areas is the hectare, defined as 104 m2. An open-pit coal mine consumes 99 hectares of land, down to a depth of 28 m, each year. What volume of earth, in cubic kilometers, is removed in this time?

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