The Great Pyramid of King Khufu was built of limestone inEgypt over a 20-year time period from 2580 BC to 2560 BC.Its base is a square with side length 756 ft and its heightwhen built was 481 ft. (It was the tallest man-made structurein the world for more than 3800 years.) The densityof the limestone is about 150 lb /  cu . ft  .(a) Estimate the total work done in building the pyramid.(b) If each laborer worked 10 hours a day for 20 years, for340 days a year, and did 200 ft - lb / h of work in liftingthe limestone blocks into place, about how many laborerswere needed to construct the pyramid?

Mathematics For Machine Technology
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ISBN:9781337798310
Author:Peterson, John.
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Chapter59: Areas Of Rectangles, Parallelograms, And Trapezoids
Section: Chapter Questions
Problem 79A
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The Great Pyramid of King Khufu was built of limestone in
Egypt over a 20-year time period from 2580 BC to 2560 BC.
Its base is a square with side length 756 ft and its height
when built was 481 ft. (It was the tallest man-made structure
in the world for more than 3800 years.) The density
of the limestone is about 150 lb /  cu . ft  .
(a) Estimate the total work done in building the pyramid.
(b) If each laborer worked 10 hours a day for 20 years, for
340 days a year, and did 200 ft - lb / h of work in lifting
the limestone blocks into place, about how many laborers
were needed to construct the pyramid?

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