Explorers in the jungle find an ancient monument inthe shape of a large isosceles

Chapter 9, Problem 47

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Explorers in the jungle find an ancient monument inthe shape of a large isosceles triangle as shown in FigureP9.47. The monument is made from tens of thousandsof small stone blocks of density 3 800 kg/m3. Themonument is 15.7 m high and 64.8 m wide at its baseand is everywhere 3.60 m thick from front to back.Before the monument was built many years ago, all thestone blocks lay on the ground. How much work didlaborers do on the blocks to put them in position whilebuilding the entire monument? Note: The gravitationalpotential energy of an objectEarth system is given byUg 5 MgyCM, where M is the total mass of the objectand yCM is the elevation of its center of mass above thechosen reference level.

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