What is the mass of the Earth? How much mass is the earth

After clarifying the concept of "mass", the study of the earth's mass naturally came to the front of scientists. It is realized that the Earth is so large that it is impossible to obtain a force that can change its state of motion by any means, and that it is absolutely impossible to weigh the gravitational mass of the Earth. But if we think about it from another angle, we can not directly weigh the weight of the earth.

If we measure the gravitational force of a common object at a certain distance from the center of the earth, we can compare it with the gravitational force exerted on that object at such a large distance from the earth's surface from the center of the earth, and the mass of the earth can be found with the mass of the object known. Still, we have the trouble that the Earth's gravitational pull is actually so small that it only reveals itself when it acts on a huge object. We believe that the gravitational pull of the Earth, like other destructive forces, is very strong, mainly because we associate it with the great Earth.

And when it is still used on an object such as an iron block, the gravitational force it produces is so small that it is almost impossible to detect. The British scientist Henry Cavendish began to solve this problem in 1798. He tied a thin wire to the middle of a lightweight wooden rod and attached a small lead ball to each end of the stick, thus creating a simple device that could be twisted freely around the hanging wire.

In this way, the small balls at both ends of the wooden stick can change the movement of the device with a single touch. Using this method, Cavendish measured the "torque" produced by the different forces. Cavendish then placed two larger metal balls in the vicinity of each of them, and the gravitational pull between them and the two balls caused the line to twist slightly.

Based on the length of the torsion arms, Cavendish calculated the mutual attraction between the two pairs of spheres, and then he calculated the mass of the Earth based on the difference between the center distance of the two pairs of spheres and the mass of each sphere, as well as the gravitational force of the same sphere on the surface (which is greater than the interaction force between the two spheres) and the suction force between the two pairs of spheres. Cavendish puts the mass of the Earth at about 6,1024 kilograms. This data is still recognized by the scientific community to this day.

As a result, Cavendish is arguably the first of its kind in the field.

Remember.

The mass of the Earth is grams, which is determined according to the law of gravitation. The determination of the mass of the Earth provides a basis for determining the mass of other celestial bodies. From the mass of the Earth, the average density of the Earth is 5 52 g cm3.

Any particle on the earth is affected by the gravitational and inertial centrifugal forces of the earth, and the combined force of the two is gravity. Gravity decreases with altitude and also varies with latitude. The acceleration due to gravity at the equator is 978

Gamma (centimeter sec2), and Gamma at the poles. In some places, gravitational anomalies also occur, reflecting the uneven distribution of matter in the Earth's interior. Gravity anomalies are associated with geological formations and deposits.

Due to the gravitational force of the sun and the moon, the gravitational acceleration of the earth also has slight periodic changes, and the maximum can reach a few tenths of a milligag. The Earth's gravitational constant is 6 times that of the Moon.

Earth is the third and fifth largest planet from the Sun: Orbital radius: 149,600,000 km (astronomical units from the Sun) Planetary diameter:

12, km Mass: kg Earth is the only name that is not derived from the Greek or Roman gods. The word earth comes from Old English and Germanic languages.

There are, of course, many other language names here. In Roman mythology, the goddess of the earth was called Tellus The Fertile Land (Greek: gaia, Haia, Mother Earth) It was not until the time of Copernicus in the 16th century that people understood that the earth was just a planet.

The Earth, of course, does not need a craft to be observed, but we did not have a map of the entire planet until the twentieth century. The Earth photographed in space has a very** value; They are a great aid in weather forecasting and storm tracking forecasting. And these ** are very beautiful!

The mass of the Earth is, which is determined according to the law of gravitation. The determination of the mass of the Earth provides a basis for determining the mass of other celestial bodies. From the mass of the earth, the average density of the earth is grams of cubic centimeters.

As early as more than 200 years ago, the ancient Greek mathematician Estosthenes used the principle of direct sunlight to estimate the diameter of the earth, and the value obtained was very close to the actual value.

Theoretically, the mass of the earth can be obtained by adding the average density of the earth, but until the 20th century, human beings did not know the structure of the earth's interior, and the average density of surface rocks was about 3g cm3, and the average density of the earth was, because the earth has a dense iron-nickel core with a density of up to 10g cm3.

In the 17th century, Newton established the law of universal gravitation, which theoretically used the Earth's radius and surface gravitational acceleration to calculate the Earth's mass.

According to: gmm r 2 = mg;

Yield: m=gr 2 g;

However, the method of calculating the mass of the earth using universal gravitation relied on the value of the gravitation constant g, and although Newton proposed the law of universal gravitation, the strength of the gravitation force was too weak, and it was difficult to use experiments to obtain the value of g under the conditions at that time.

It was not until more than 100 years later in 1789 that the British scientist Cavendish used a precise torsion scale experiment to obtain the value of the gravitational constant for the first time, and the value obtained at that time was g =, and this measurement accuracy was maintained until 1969, and now the most accurate value is g =.

The radius of the Earth's equator is about 12,756 kilometers, the polar radius is about 1,371 kilometers, the average radius is about 6,371 kilometers, and the circumference of the equator is about 40,076 kilometers.

The equatorial radius of the Earth is 6378137m, the polar radius RB=6356752m, and the fan rate is 1, ignoring the non-spherical symmetry of the Earth, with an average half of R 6371km.

The value of gravitational acceleration at a certain sea level at the equator is 9a, the value of gravitational acceleration at a certain sea level at the North Pole is GB, the global standard value of gravitational acceleration is 9, and the Earth's rotation period is 23 hours, 56 minutes and 4 seconds (sidereal days), that is, t.

The Earth's interior has a core, mantle, and structure, and the Earth's exterior has a hydrosphere, atmosphere, and magnetic field. The Earth is the only celestial body in the universe where life is known, and it is home to millions of creatures, including human beauty.

Geologists divide the history of the Earth into five generations: Archean, Proterozoic, Paleozoic, Mesozoic, and Cenozoic. Scientists are due to the inability to determine.

Is the earth getting heavier and lighter with different opinions? A long, long time ago someone wondered what is the mass of the Earth? Archimedes, a scientist in ancient Greece, once said:

Give me a fulcrum, and I'll pry the earth up. In 1789, the famous British physicist Cavendish conducted a famous torsion scale experiment and measured the gravitational constant, which made it easy to calculate the mass and average density of the earth. Later, after many tests and improvements by many scientists, it was basically determined that the mass of the earth is tons.

So, has the mass of the earth changed since the day it was born? This has become a hot spot for many scientists.

Some scientists believe that the mass of the Earth itself is gradually decreasing. This is due to the fact that the earth's material is constantly escaping outward. Some people figuratively say that the earth's atmosphere, like a car tire, will "leak", so the outermost layer of the earth's atmosphere is called the fugitive layer.

At the same time, during each eruption, it is also possible that some volcanic dust will fall into space.

Most scientists believe that the mass of the Earth is constantly increasing.

This increase comes mainly from meteorites flying out of the sky, which weigh very large, and the largest known iron meteorite in the world weighs 60 tons.

So, will the Earth get heavier or lighter? This question is of great interest to each of our inhabitants of the planet, and we hope that scientists will come to a conclusion sooner rather than later.

In 1879, Charles Darwin Jr. put forward the idea that the moon flew out of the earth early in the history of the earth, and that the Pacific Ocean was the trace left by that separation.

In 1976, in a "meteorite rain" in Jilin, China, a large meteorite was found - Jilin No. 1 meteorite, weighing 1770 kilograms, surpassing the Norton-Fourness meteorite in the United States, which was originally the champion of meteorites. Become the largest stony meteorite in the world.

Cavendish puts the mass of the Earth at about 6,1024 kilograms.

The equatorial radius of the earth ra=6378137m, the polar radius rb=6356752m, the flattening rate e=1, ignoring the non-spherical symmetry of the earth, the average radius r=. The value of gravitational acceleration at a certain sea level at the equator is ga=, the value of gravitational acceleration at a certain sea level in the North Pole is gb=, the global standard value of gravitational acceleration is g=, and the earth's rotation period is 23 hours, 56 minutes and 4 seconds (sidereal days), that is, t=.

The mass of the earth m is kilograms. Basic parameters of the Earth: Mean equatorial radius:

ae = m Mean pole radius: ap = m Mean radius: a = m Equatorial gravitational acceleration:

ge = m2 average angular rotational velocity: e = 10-5 radians sec flattening: f = mass:

m = 1024 kg Gravitational constant: ge = 1014 m3 sec2 Average density: e = g cm3 Sun-to-Earth mass ratio:

s e = Sun-Earth-Moon mass ratio: s (m+e) = length of return year: t = days Average distance from the Sun:

a = 1011 m Escape velocity: v = km seconds Surface temperature: t = - 30 45 Surface atmospheric pressure:

p = millibar Surface gravitational acceleration (equator) cm Second2 Surface gravitational acceleration (polar) cm Second2 Rotation period 23:56:4 (mean solar time) Orbital semi-major diameter 149597870 km Orbital eccentricity Orbital period 1 sidereal year Yellow red angle 23 degrees 27 minutes Earth's sphere structure Earth's oceans 361745300 square kilometers Crustal thickness km Mantle depth km Core radius km Surface area 510067866 square kilometers.

Cavendish believed that the mass of the Earth is about 6 10 24 kg The equatorial radius of the Earth Ra = 6378137m, the polar radius Rb = 6356752m, the flattening rate e = 1, ignoring the non-spherical symmetry of the Earth, the average radius r =. The value of gravitational acceleration at a certain sea level at the equator is ga=, the value of gravitational acceleration at a certain sea level in the North Pole is gb=, the global standard value of gravitational acceleration is g=, and the earth's rotation period is 23 hours, 56 minutes and 4 seconds (sidereal days), that is, t=. If the mass of the Earth is considered homogeneous, and the influence of other celestial bodies is ignored, the mass of the Earth can be calculated in the following way.

Method. 1. At the equator, the gravitational pull of the Earth on an object with mass m is equal to the sum of the gravitational force of the object and the centripetal force that rotates with the Earth, then the kg method is used.

2. In the North Pole, the rotation of the earth is not taken into account, and it is calculated as a method.

3. Treat the earth as a sphere with uniform mass, ignore the influence of rotation, take the average of the radius, and take the standard value of gravitational acceleration. Then the distance between the moon and the earth is r from the moon and the earth, and the lunar rotation period is 27 days, 7 hours, 43 minutes and 11 seconds (sidereal day), that is, the moon and the earth are regarded as mass points, and the mass of the moon is m months. Method.

Fourth, for.

Cavendish puts the mass of the Earth at about 6,1024 kilograms.

Earth. Ball.

Base. Root. Number. Occupy.

The radius of the equator is 6378140 meters.

Flattening factor. Quality grams.

The average density is gram cm3

Surface gravity accelerates the destruction of the car (equator) cm sec2

Surface gravity fiber preparation acceleration (polar) centimeter sail medium meter 2 rotation period 23:56:4 seconds (mean solar time).

The semi-long diameter of the orbit is 149597870 km.

Eccentricity of the orbital revolution.

The orbital period is 1 sidereal year.

Yellow and red angle 23 degrees 27 minutes.