Why is the sky blue Why does the earth have a gravitational pull

This is related to the length of the light wave of blue light, the air can be longer and shorter than the wavelength of blue light to penetrate, and the light wave of blue light is a coward, encountering a certain blockage and going back. Scattering is formed. So you can see the blue sky too.

The first one is good. That's the result of the atmosphere scattering sunlight. The second Apple problem is not good. Try to answer, because without gravity there is no air. Then there is no one, and there is no one for you to ask this question.

As shown in the figure below: the earth is approximately a sphere, simplified to a sphere...

Then the object with mass m on the ground is equal to the magnitude of attraction f of the earth, and the direction points to the center of the earth o1.

Assuming that M is located at M position on the ground, since M rotates with the earth, M will move in a circle around the latitude line with O2 as the center of the circle, and the required centripetal force F1 is provided by the component of F, the closer to the north and south poles, the smaller the radius of the circle centered on O2, it can be seen from F1=M R, the smaller F1, the size of F remains the same, F1 decreases, F2 is getting closer and closer to F (i.e., F2 gradually increases) and F2 is the usual gravity, then it can be known from gravity G=mg=F2:

g is getting bigger.

Gravity: The force of mutual attraction between all objects with mass. This force exerted by the Earth on other objects is called gravity.

The gravitational pull experienced by other objects is in any direction. According to Newton's law of gravitation, there is a gravitational force between any two substances that have mass.

According to the law of gravitation, there is an attractive force between any two objects. This includes between the Earth and other objects. Its size is directly proportional to the product of the masses of the two and inversely proportional to the distance.

Since the mass of the earth is very large, and the distance between the objects on the surface and the earth is small, there will be a large gravitational pull.

The Earth itself has quite a large mass, so it also exhibits gravitational pull on any objects around the Earth. Take a cup as an example, the earth shows gravitational pull on the cup at any time, and the cup also shows gravitational pull on the earth.

The mass of the earth is too large, and the gravitational force on the cup is very large relative to its own mass, and the acceleration is relatively large, so the cup is attracted to it, and the direction is towards the center of the earth, and this force is gravity.

The Earth's gravitational pull is generated by the Earth's magnetic field, which is mainly the dimagnetic field of the north and south poles, which originates in the deep part of the earth. There are many theories about the cause of the Earth's main magnetic field, the most plausible explanation of which is the generator theory. It is believed that the molten iron and nickel alloys in the outer core of the earth can flow, and from this flow an electric current can be generated. The generation of electric current maintains the continuous flow of matter, and so on, and maintains the existence of the main magnetic field.

Because of each.

Planets are the same as a galaxy, there is a strong gravitational substance on the planet, for example, there is a small black hole in the Milky Way back, which attracts the surrounding matter, so the Milky Way moves in a ring.

In the same way, the earth also has a strong gravitational substance, which attracts things on the surface of the earth to **, in fact, people do not have to stand on the earth, they can live upside down, but human beings have evolved into the current upright walking after evolution and natural selection, which is the law of gravitation.

You may be asking why the gravitational pull of the Earth and the Moon are different.

Because the Moon itself is smaller in mass and volume than the Earth. Therefore, the gravitational force emitted by the gravitational material formed by ** is not as large as that of the earth.

Think of a star like a white dwarf, the larger the star compresses into gravitational matter, the stronger the gravitational pull. Therefore, the star will compress itself before **, compress itself to the smallest volume, and then release it.

Gravitational force is the gravitational force that is eventually integrated together.

There is a universal gravitational force between matter, and the magnitude of the gravitational force is related to the mass of the object, the distance between the two objects, and the direction is along the direction of the straight line determined by the two objects, and the gravitational force of the two objects is equal and the direction is opposite.

The universal gravitational force between the earth and the objects on the earth is manifested as gravity, in fact, gravity is everywhere, even between two feathers, but the mass is too small to be easily detected by the naked eye.

The famous Cavendish torsion scale is specially used to measure the gravitational force of the earth, the mass of the earth is very large, so the gravitational force is large enough that we can feel that we are always standing on the ground, because the direction of gravity is along our line with the center of the earth, and points to the center of the earth.

Newtonian mechanics shows that all objects are attracted to the surrounding objects because of their mass.

force, due to this force genus.

It's everywhere, and we call it gravity. That is, as long as there is mass, gravitational attraction is generated.

The mass of the Earth is so large that it exerts a strong gravitational pull on the objects around it, which we call gravity.

At the end of the day, Newton didn't know why gravity existed before he died, so he studied theology, and so did Einstein, and in his old age, they studied theology, because they couldn't find the strongest evidence to support their doctrine as to why matter has a gravitational ......

The Earth itself has a considerable mass, so it also exhibits gravitational force towards any object around the Earth. Take a cup as an example, the earth shows gravitational pull on the cup at any time, and the cup also shows gravitational pull on the earth. The mass of the earth is too large, and the gravitational pull on the cup is also very large, so the cup is attracted to it, and the direction is towards the center of the earth, and this force is gravity. Gravity is not equal to the gravitational pull of the Earth on an object.

Due to the rotation of the earth itself, in addition to the poles, objects in other places on the ground are moving in a uniform circle around the earth's axis with the earth, which requires a centripetal force pointing perpendicular to the earth's axis, and this centripetal force can only be provided by the earth's gravitational force on the object, we can decompose the earth's gravitational force on the object into two components, one component f1, the direction points to the earth's axis, and the magnitude is equal to the centripetal force required for the object to move in a uniform circular motion around the earth's axis; The other component g is the gravitational force on the object (illustrated), where f1 = mw2r (w is the angular velocity of the earth's rotation and r is the radius of rotation of the object), which shows that the magnitude of f1 is zero at the poles, increasing with the decrease of latitude, and the maximum f1max is in the equatorial region. Because the centripetal force of the object is very small, in general, it can be considered that the gravitational force of the object is the magnitude of the gravitational force, that is, the effect of the rotation of the earth can be omitted in general.

Because the Earth's core transforms energy to produce a magnetic field.

Because of gravity, everything has a gravitational pull. The larger the object, the greater the gravitational pull.

The force of attraction between all objects with mass. This force exerted by the Earth on other objects is called gravity. The direction of gravity experienced by other objects is towards the center of the earth.

This is due to the rotation of the Earth. The rotation of the Earth creates a force called geostrophic deflection. In the Northern Hemisphere, it causes the object to be moved in a direction that wants to be biased to the right; In the Southern Hemisphere, it causes the object to move in a direction that is biased to the left. So in the Northern Hemisphere it's counterclockwise, and in the Southern Hemisphere it's clockwise.

In 1665, the famous physicist Isaac Newton discovered the law of universal gravitation. This proves that gravity and matter coexist, and where there is matter, there is gravity. It is not only the earth that has gravity, but all matter has gravity between them. So, why does the Earth have a gravitational pull?

From the perspective of the formation of the earth, the earth is under the action of gravity, through the attraction of material particles to each other, continuous condensation, accumulation and evolution, so from this point of view, the earth also originated by gravity.

From the perspective of the earth's own characteristics, the earth is a sphere with magnetic force, so the center of the earth will naturally produce a huge gravitational force, which firmly attracts all the materials on the earth.

From the point of view of the law of the earth's motion, in the process of the earth's rotation around the earth's axis and the sun's revolution, due to the interaction between the earth itself and the earth and the sun, the earth has a gravitational force, which can compete with the sun's gravitational force, so that the earth will not be attracted by the sun's strong gravitational attraction and "go the wrong way".

Gravitation also exists between matter that is considered matter and antimatter, and is universal everywhere except for a slight modification of Newton's theory of universal gravitation proposed by Einstein's theory of general relativity.