On the question of the geographical orientation of the Earth in the pyramids. Satisfaction with addi

The first question, of course, is that it is most convenient to use a compass. But you have to know the geomagnetic declination to find the north and south of the earth, not the north and south of the geomagnetic field. The geomagnetic declination can be found.

The second question, if your pyramid material is uniform and the mass distribution is uniform, then its geometric center is the center of gravity, which can be found by hanging, the specific calculation method is more complicated, there is no ready-made formula I don't know, but it is not impossible to calculate, the center of gravity must be on the line between the apex of the pyramid and the center of the bottom surface, then take any point on this line and use a plane parallel to the bottom plane to cross the upper and lower parts of the weight equally, this point is the center of gravity.

Also, the upstairs is not right, the geometric center is indeed the same distance from the four sides, but any point on the line connecting the top and bottom center of the pyramid fits this condition!

The first question is to use one side of the pyramid to aim at the sun at noon, remember that it must be local time [we use Beijing time, convert it to local time].

The second question: the pyramid position triangular pyramid is flanked by a hosceles triangle.

The triangular pyramid can be called four small triangular pyramids of equal volume, because the length of the bottom side and the length of the side edge can be measured. And because the distance from the geometric center of the pyramid to the four faces is equal, that is, let this distance be x, and the bottom surface can be found. The volume formula of the triangular pyramid is one-third of the base area [a] multiplied by [height i.e. h] multiplied by [one-third] equals [side area] multiplied by [x] multiplied by [three] multiplied by [one-third] plus [base area] multiplied by [one-third] multiplied by [x] and the equation is found to find [x].

For example, if you look down on the North Pole, the southern end of the top view is still the northern end of the world map.

The relative plane of the plane, do you know the round place of the sky that was said before?

Isn't the three-dimensional flower of the plane up and down, left and right, back and forth?

Located east of the departure point. The distance to the north is the same as the distance to the south, so if there are no other conditions, it is in the same place, but there are still 20 kilometers to the east in the question, so choose B

This question examines the shape of the latitude and longitude grid, which is actually an isosceles trapezoid. Let's look at the picture:

A is the starting point, AB and CD are two meridians, AD is the equator, BC is the latitude, AB=BC=CD=ED=20 km.

If you go 20 km due north, 20 km due east, 20 km due south, and finally land at point D, east of the starting point, if you go 20 kilometers due north, 20 kilometers due east, 20 kilometers due south, and then 20 kilometers due west, the landing point is at point E, or it is located east of the starting point.

To the east of the starting point, it is determined by the dimension of the earth.

Excuse me, it's not on Earth, it's on **??? It is said that the designer and architect of the pyramids, was the first genius in history to transcend his time. Hotep.

However, his "genius" was too far ahead of his time to cause our rightful surprise and suspicion. It was quite difficult to level a huge convex rock into a base of 52,900 square meters, and they completed the survey and construction of the base without a level, without power equipment, and without modern means of measurement. Its four bottom edges differ by less than 20 centimeters, and the error rate is less than one thousandth.

The height difference between its southeast and northwest corners is only centimeters, and the error rate is less than 1/10,000....The force and position error of its east-west axis and north-south uranium is not more than 5 arc seconds, they do not have a "ruler", they only use the arm as a unit of measurement, called a wrist ruler (300 wrist rulers are equal to about 155 meters), how can the tower be built so accurately? It's confusing!

In order to ensure the longevity of the pyramid, the designers did not need a single piece of wood or an iron nail, because wood is perishable and iron is easy to rust, which are all hidden dangers of solidity. There was no bond between the stones, but they fit together so seamlessly that not even the thinnest blades could fit in.

How to build up the stones layer by layer is a mysterious subject that leads people to speculate Some people say that it is a wooden boat-shaped tool that uses the principle of levers to gradually raise the boulders and build them layer by layer. However, where do the brackets and ropes that can lift several tons, dozens of tons, or even more than l00 tons come from? Some people say that the sand filling method is used to fill the sand along the base of the tower.

The sand fence rises with the base of the tower, acting as a foot robe, and after the tower is completed, the sand is removed. Now, let's do a math problem: The Kinning Tower in Egypt is a square cone with a pointed bottom and a height of l46 meters. The base of the tower is square, with a side length of 230 meters, Q: What is its volume?

If sand were to be placed around its perimeter to create a slope that could transport stones, and the angle of the slope would be 30 or 25 degrees, how many meters would its base edge be? Suppose they are also 146 meters high, how many squares of sand do you need for each? So much sand coming from?

In addition, the volume of transportation will be doubled. Some people say that it is the use of salt filling method, the method is the same as above, after use, only need to dissolve it with water, no need to move away, but so much salt is more difficult to obtain than Shayu. What's more, a heavy rain will dissolve the entire salt slope.

Some people think that the Nile mud bricks were used to build a spiral ramp, which stopped rising layer by layer, and the result was similar to that of the sand slope, except that the mud bricks were more difficult to obtain than the sand.

It was built by the ancient Egyptians.

Did you look at some sci-fi ** said that it was built by aliens.

The way things are because we see them the way they are.

The pyramids were built by man, man on the earth, of course man built it on the earth, otherwise he could have run to the extraterrestrial terrestrial construction (

Hello, are you sure you made a mistake? Because from this question, it is true that A is in the northeast of B, but C is due west of D.

The teacher said that "standing at the North Pole, there is the south in front of you, left and right" is correct, and there is only one North Pole, which is the point in the middle of this picture. ABCD isn't the North Pole.

Because the references b and d are not at the north pole. This is just a graticule diagram centered on the North Pole. Just follow the requirements of the graticule map to judge the direction.

The lying person represents the developed or northern country, and the standing person represents the developing country or the southern country.

The people standing represent the developing countries, also known as the countries of the South, because the vast majority of the countries of the southern hemisphere are developing countries. The lying people represent the developed countries, also called the northern countries, because the vast majority of the developed countries are in the northern hemisphere. The illustration is also very vivid, the lying person is very fat, and there is an unfinished chicken leg in his mouth, while the standing person is thin and small, holding an empty spoon in his hand, looking for anything to eat.

· .City A has a large population of young people, while the population of city B has a larger proportion of young adults than city A. A is a growing population model, while B has a more reasonable population structure.

The natural growth rate is [(new population - dead population) total population] Therefore, the proportion of new population increases, the greater the natural growth rate.

Answer: a.

AA is a developing country with a large inertia of population growth and a high natural population growth rate.

b is a developed country with a stable population structure and a low natural population growth rate.

a>b, as can be seen from the information in the figure, the proportion of new population in figure a is significant, so the natural growth rate is also large.