a question about angle of sand
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
European sand or African sand?
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
Is the book referring to wet sand?
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Is the book referring to wet sand?
can not tell, but it looks like wet sand has good repose angle for 45 degree...
diligent hands rule....
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European sand or African sand?
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can not tell, but it looks like wet sand has good repose angle for 45 degree...
diligent hands rule....
Yeah, it does seem a little steep. I would assume the 30 degrees is more accurate. I have been trying to sanity check it by imagining a stack of marbles. A triangular pyramid of marbles would have a 45 degree angle on the face. That would not be the angle of repose though.
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Yeah, it does seem a little steep. I would assume the 30 degrees is more accurate. I have been trying to sanity check it by imagining a stack of marbles. A triangular pyramid of marbles would have a 45 degree angle on the face. That would not be the angle of repose though.
Well, the relative roughness or smoothness of the individual grains should matter, yes?
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Yeah, it does seem a little steep. I would assume the 30 degrees is more accurate. I have been trying to sanity check it by imagining a stack of marbles. A triangular pyramid of marbles would have a 45 degree angle on the face. That would not be the angle of repose though.
the amazing part is that The Great Pyramid's repose angle is 51.5 degree...
diligent hands rule....
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
Sand comes in all sorts of forms. Fine, coarse, mixed and everything in between. Then there is the source of sand, desert sand, sea sand, natural underground sand domes, etc. Then there are various sand minerals. Talk to an concrete expert.
"A little time, a little trouble, your better day" Badfinger
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Sand comes in all sorts of forms. Fine, coarse, mixed and everything in between. Then there is the source of sand, desert sand, sea sand, natural underground sand domes, etc. Then there are various sand minerals. Talk to an concrete expert.
"A little time, a little trouble, your better day" Badfinger
Not sure we were looking for a concrete answer. ;P
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Not sure we were looking for a concrete answer. ;P
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Sand comes in all sorts of forms. Fine, coarse, mixed and everything in between. Then there is the source of sand, desert sand, sea sand, natural underground sand domes, etc. Then there are various sand minerals. Talk to an concrete expert.
"A little time, a little trouble, your better day" Badfinger
this pyramid is with slope of 51.5 degree...
Quote:
The dimensions of the pyramid were 280 royal cubits (146.7 m; 481.4 ft) high, a base length of 440 cubits (230.6 m; 756.4 ft), with a seked of 5+1/2 palms (a slope of 51°50'40").
diligent hands rule....
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
What I've heard and also seen pictures from those who've gone there, is that the pyramid is not sand, but cuboid-shaped stones placed one upon the other. Each such stone is about 1.5 feet to 2 feet in side-length.
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
As for the Great Pyramid of Giza it is rather curious its latitude is the speed of light in m/s
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As for the Great Pyramid of Giza it is rather curious its latitude is the speed of light in m/s
Which comes even more surprising if you consider that the meter has existed as a unit of measurement for just a couple hundred years. An exact definition of the second is far more recent. So the old Egyptians were sure ahead of their time! It reminds me of the great wisdom of nature: A million years ago, no one knew that we would be wearing eyeglasses. Yet nature put the ears in just the right position to hold them.
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I am reading a book related with the Great Pyramid of Gizeh and get this statement: "the natural repose of sand is 48 degree". but when I did google and find this link. it tells me the for dry sand, this angle is 30 degree. do I miss anything?
diligent hands rule....
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Which comes even more surprising if you consider that the meter has existed as a unit of measurement for just a couple hundred years. An exact definition of the second is far more recent. So the old Egyptians were sure ahead of their time! It reminds me of the great wisdom of nature: A million years ago, no one knew that we would be wearing eyeglasses. Yet nature put the ears in just the right position to hold them.
Hei, No comment about light speed in m/s at latitude, probably a coincidence. :~ There is a really easy to understand reason why the modern meter appears in the pyramids. *Really* easy to understand reason why the modern meter appears in the Egyptian pyramids. Spend a few minutes to do the basic math yourself. 1.) Here is a [seconds pendulum](https://en.wikipedia.org/wiki/Seconds\_pendulum). Guess how long the rope is? The rope/rod is 1 meter long. [Royal cubits to meters](https://www.convertunits.com/from/cubit+\[Royal+Egyptian\]/to/meters) (Enter 2) No aliens, no "ancient technology", just a coincidence I guess. Anything you build using the royal cubit will contain an approximation of the modern meter. Basic geometry. My "guess" is that the Egyptians might have been experimenting with a unit of time equal to [1 minute of time](https://en.wikipedia.org/wiki/Ancient\_Mesopotamian\_units\_of\_measurement#Time) divided by two using a pendulum. Why would it be hard to believe that they tried to divide the minute? Btw, do the math. Guess what the "arc length" of a modern seconds pendulum is? The arc length of a two second pendulum is 1 royal cubit. My opinion is that they wanted to define a unit of measurement equal to two seconds of our modern minute. I'm just guessing.
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Hei, No comment about light speed in m/s at latitude, probably a coincidence. :~ There is a really easy to understand reason why the modern meter appears in the pyramids. *Really* easy to understand reason why the modern meter appears in the Egyptian pyramids. Spend a few minutes to do the basic math yourself. 1.) Here is a [seconds pendulum](https://en.wikipedia.org/wiki/Seconds\_pendulum). Guess how long the rope is? The rope/rod is 1 meter long. [Royal cubits to meters](https://www.convertunits.com/from/cubit+\[Royal+Egyptian\]/to/meters) (Enter 2) No aliens, no "ancient technology", just a coincidence I guess. Anything you build using the royal cubit will contain an approximation of the modern meter. Basic geometry. My "guess" is that the Egyptians might have been experimenting with a unit of time equal to [1 minute of time](https://en.wikipedia.org/wiki/Ancient\_Mesopotamian\_units\_of\_measurement#Time) divided by two using a pendulum. Why would it be hard to believe that they tried to divide the minute? Btw, do the math. Guess what the "arc length" of a modern seconds pendulum is? The arc length of a two second pendulum is 1 royal cubit. My opinion is that they wanted to define a unit of measurement equal to two seconds of our modern minute. I'm just guessing.
Similar to finding PI factored in acient construction. Rolling measuring wheels tend to have it built in.
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Similar to finding PI factored in acient construction. Rolling measuring wheels tend to have it built in.
Yeah, When researching this a few years ago I discovered there are two types of "crackpots". - Those who will believe anything, especially "conspiracy theories". - Those who dismiss everything without investigation and critical thought process. The Cheops pyramid appears to have "two seconds" encoded all over it. It just looks to me like Egyptions were engaged in defining [additional measurements of time](https://en.wikipedia.org/wiki/Ancient\_Mesopotamian\_units\_of\_measurement#Time). I don't have a problem believing Egyptions were using pendulums. They probably never defined it "officially" because they knew it was slightly inaccurate. The royal cubit *might be* the arc length of a 2 second pendulum. We are of course speculating.