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anonymous

  • 5 years ago

If an average rectangular block of limestone used to build the Great Pyramid of Khufu at Giza is approximately 2.5 feet by 3 feet by 4 feet and limestone weighs approximately 170 pounds per cubic foot, what is the weight of one of the nearly 2,300,000 limestone blocks used to build the pyramid?

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  1. anonymous
    • 5 years ago
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  2. dumbcow
    • 5 years ago
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    First find the volume of the block, then multiply by 170 volume = length *width*depth

  3. anonymous
    • 5 years ago
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    can u show me that volume = length *width*depth?

  4. anonymous
    • 5 years ago
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    can u show me that volume = length *width*depth?

  5. dumbcow
    • 5 years ago
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    why that is the volume? well imagine how many 1 cubic foot boxes could fit in our 2.5 by 4by3 block the base of our figure is a rectangle of length 4 and width 3 thats an area of 12 so i could draw 12 1 ft squares, now imagine each of these squares is 1 ft high, to fill up the block we would need 2.5 layers of these 12 cubes does that help at all?

  6. anonymous
    • 5 years ago
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    then what happen next

  7. dumbcow
    • 5 years ago
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    well the volume is the total number cubes 12*2.5

  8. anonymous
    • 5 years ago
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    i got 30

  9. dumbcow
    • 5 years ago
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    correct

  10. dumbcow
    • 5 years ago
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    now since each cubic foot weighs 170 lbs ->30 * 170

  11. anonymous
    • 5 years ago
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    is that a neg?

  12. dumbcow
    • 5 years ago
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    no sorry its an arrow

  13. anonymous
    • 5 years ago
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    my bad

  14. anonymous
    • 5 years ago
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    51oo

  15. dumbcow
    • 5 years ago
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    correct for the other problem you posted, its done the same way except you have to find the area of the triangle first

  16. anonymous
    • 5 years ago
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    which is

  17. dumbcow
    • 5 years ago
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    Area of triangle = (1/2)*length*height

  18. anonymous
    • 5 years ago
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    which is the lenght and height

  19. dumbcow
    • 5 years ago
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    look at the triangle part of the diagram these 2 lines represent length and height | | | ______________________

  20. anonymous
    • 5 years ago
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    I mean the number of the triangle

  21. dumbcow
    • 5 years ago
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    its on the diagram

  22. anonymous
    • 5 years ago
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    1/2 (3)x2.5?

  23. dumbcow
    • 5 years ago
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    no that was for the last problem, i thought we were talking about the triangular prism (the ramp)?

  24. anonymous
    • 5 years ago
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    oop my bad

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