Objects are very slow and can fly vertically away from the Earth

It's just theoretically possible, but before it gets off the ground, if the object is slow (the kinetic energy is small), but assuming that the kinetic energy does not change when it can fly away from the earth, the potential energy is the largest, that is, there needs to be a force that works on the object all the time to increase the potential energy of the object, which is much more difficult to achieve than high speed.

In fact, the cosmic velocity is reached to provide enough energy for the object In the Earth's frame of reference (under the condition of conservation of kinetic energy plus potential energy), only when the initial kinetic energy is large can it reach the height of the gravitational pull away from the Earth's gravity (the potential energy of kinetic energy conversion).

For example, a geostationary satellite, the launch speed of a geostationary satellite is the first cosmic velocity, so in space it can only be stationary relative to the Earth (the potential energy reaches its maximum, and the kinetic energy becomes 0).

I've thought about this question a long time ago, and in theory, yes, you're right, if you let the space shuttle fly out of the Earth, you just need to make sure that the thrust in the vertical direction is greater than its gravity.

But the Space Shuttle needs to perform space missions in the outer layers of the Earth, that is to say stay in orbit (orbit the Earth).

If the launch is to let it accelerate to the first cosmic velocity, you can turn off the engine in orbit and it can fly around the Earth at the first cosmic velocity.

But if it is going up slowly, it must be powered throughout the flight, which requires a lot of energy to maintain uninterruptedly, and once it loses power, the spacecraft will fall.

If you don't understand it or still have questions, you can continue to ask me at any time

The plane disintegrated into pieces in the air.

Categories: Education, Science, >> Science & Technology.

Analysis: When the body reaches a speed of kilometers and seconds, it can free itself from the constraints of the earth's gravity. In the process of getting rid of the shackles of the earth, under the action of the earth's gravity, it does not fly away from the earth in a straight line, but flies in a parabola.

After breaking away from the Earth's gravitational pull, it orbits the Sun under the action of the Sun's gravitational pull. To escape the gravitational pull of the Sun and fly out of the solar system, an object must move at a speed of 1,000 seconds. It will then fly away from the Earth in a hyperbolic trajectory, and it will fly away from the Sun in a parabola relative to the Sun.

Human space activities are not just about escaping the earth. In particular, the current application spacecraft needs to fly around the Earth, that is, let the spacecraft move in a circle. We know that there must always be a force equal in magnitude to the centrifugal force and in the opposite direction acting on the spacecraft.

Here, we can take advantage of the gravitational pull of the Earth. This is because the gravitational pull of the earth on an object is exactly in the opposite direction of the centrifugal force in which the object moves in a curvilinear motion. It has been calculated that when the speed of motion of an object on the ground reaches a kilometer second, the centrifugal force generated by it is equal to the gravitational pull of the earth on it.

This velocity is known as the orbital velocity.

The speed at which the object moves in a circle around the earth is called the first cosmic velocity; The speed at which the earth flies away from the gravitational pull of the earth is called the second cosmic velocity; The speed at which the sun is free from the gravitational pull of the sun and flies out of the solar system is called the third cosmic velocity. According to the law of gravitation, the magnitude of the gravitational force between two objects is inversely proportional to the square of their distance. Therefore, the distance of an object from the center of the earth is different, and its orbital velocity (first cosmic velocity) and separation velocity (second cosmic velocity) have different values.

Our universe is very magical, from ancient times to the present, many scientists, writers, etc. have been studying our universe, our solar system, they found that the earth has rotation and revolution, and the speed is very highThen some people ask why people can stand on the ground and not be thrown out of the earth when the rotation speed of the earth is so high? This is due to the gravitational presence of our earth on our human body, which is what we call gravitational force.

The Earth's equator is about 40,000 kilometers long, and the linear velocity of the equator is about 1,668 kilometers per hour, which means that it can reach about 463 meters per second. This speed has clearly exceeded the speed of sound. So as a small creature on the earth, why haven't humans been thrown out of the equatorial region?

This is because there is gravitational force on the earth, and the area of the earth is very, very large for humans, so although the rotation speed is very high, it is still relatively small compared to humans.

Because humans are also following the rotation of the earth at the same speed, the two are relatively stationary, so people can stand on the ground and not be thrown out.

The reason why people can stand on the ground and not be thrown out is due to the effect of gravity and inertia. In addition, man rotates at the same speed as the earth, and man is stationary relative to the ground.

It takes kilometers and seconds to fly out of the Earth.

The three cosmic velocities are based on the study of the motion laws of the two particles under the action of gravitational force, and people usually call the minimum launch velocities required for spacecraft to orbit the earth, break away from the earth and fly out of the solar system, which are respectively called the first cosmic velocity, the second cosmic velocity and the third cosmic velocity.

The first cosmic velocity is a kilometer second, which is called orbital speed, and when a spacecraft is actually launched, as long as there are kilometers and seconds, it is enough, and the condition is that it is launched from west to east at the equator, with the help of the earth's rotation speed of about 400 m s. The second cosmic velocity is called the detachment velocity, and when it is reached, it can leave the earth. The third cosmic velocity is called escape velocity, and with the help of the earth's rotational speed, it is possible to escape from the solar system.

Summary. Hello! Dear, I'm glad to answer for you, the horizontal linear velocity around the earth will not decrease when an object is falling freely relative to the ground.

Because when an object is falling freely, its velocity changes only in the vertical direction, whereas the horizontal linear velocity is in the horizontal direction, so the horizontal linear velocity does not change. When an object is falling freely, the kinetic energy of the object becomes less due to gravity and is converted into potential energy. This is in line with the law of conservation of kinetic energy, as the law of conservation of kinetic energy is defined as the fact that kinetic energy does not change when the object falls freely, i.e., the sum of kinetic energy does not change.

Will the horizontal linear velocity of an object falling high in the air at a stationary height decrease relative to the ground? So how does the overall kinetic energy change? Is it still possible to simply use the law of conservation of kinetic energy?

Hello! Dear, I'm glad to answer for you, the horizontal linear velocity around the earth will not decrease when an object is falling freely relative to the ground. Because when an object is falling freely, its velocity changes only in the vertical direction, whereas the horizontal linear velocity is in the horizontal direction, so the horizontal linear velocity does not change.

When an object is falling freely, the kinetic energy of the object becomes less due to gravity and is converted into potential energy. This is in line with the law of conservation of kinetic energy, as the law of conservation of kinetic energy is defined as the fact that kinetic energy does not change when the object falls freely, i.e., the sum of kinetic energy does not change.

In general, when an object is in free fall, the horizontal linear velocity around the Earth does not change, but the overall kinetic energy becomes smaller, and this is consistent with the law of conservation of kinetic energy.

But after the object reaches the ground, it is still stationary relative to the earth, the radius becomes smaller, and the linear velocity will not become smaller (although the radius becomes very small) What is the potential energy, and the decrease in gravitational potential energy should not bring about an increase in kinetic energy I am mainly curious about the decrease in the horizontal linear velocity of the object, and what the corresponding kinetic energy has become I think about a little too much, sorry.

Dear, how many questions do you have?

When an object hits the ground, it is indeed right to be stationary relative to the Earth. The radius of the object becomes smaller, resulting in a smaller linear velocity. This is because when an object lands, it is subjected to friction and air resistance, which slows down the object.

Gravitational potential energy is the energy produced due to the gravitational action between an object and the earth. When an object lands, the gravitational potential energy decreases while the kinetic energy increases. This is because the object is subjected to an elastic force when it lands, which causes the object to experience an increase in kinetic energy.

The linear velocity of the object decreases horizontally, and the corresponding kinetic energy is converted into heat energy generated by friction and air resistance. This heat energy is absorbed by the object and other objects in the environment.

Okay, thank you, I will give five stars, then if I take the ground as a reference frame, the object falls vertically, theoretically the horizontal direction should not be forced, do you have to consider the geostrophic deflection force?

If the ground is used as the frame of reference and the object falls vertically, then the object will not be subjected to external forces in the horizontal direction. Because the motion of the object is linear motion and there is no horizontal component. However, if the influence of the Earth's rotation on the falling motion of the object is considered, there will be a geostrophic deflection force, which may cause the object to have a small velocity component in the horizontal direction.

This velocity component is due to the rotation of the Earth.

Free fall is the ideal state, that is, there is no air resistance, in this case the acceleration of the object is constant, the constant gravitational acceleration g 10m s, it will always accelerate!! But in the non-ideal case, which is the reality, the drag on the object will increase with the increase of velocity, and when the drag increases with the increase of velocity to the same as gravity, the acceleration is 0, so the object will move at a uniform speed, such as the rain in the sky.

That's it, hope

The free fall of the object is not only affected by gravity, but also the air resistance, the magnitude of the air resistance is related to the velocity, when the velocity reaches a certain value, the air resistance and gravity are equal, at this time the object is balanced by the force, the acceleration is zero, and the motion is uniform.

Provided that it is on Earth.

Because the frictional force of the atmosphere prevents the object from falling, the faster the object, the higher the friction it produces until it reaches a constant velocity.

Who taught you to move at a certain speed at a certain maximum speed? As long as there is acceleration, it will continue to accelerate, and the acceleration of a free fall is always g, hope.

To fly out of the earth to reach the first cosmic velocity, the first cosmic velocity is. Only above this speed can you break free from the gravitational pull of the earth and fly out of the earth.

But humanity has already broken through, and we have already launched numerous probes to other planets.

Just like the speed of a spaceship, you can leave the earth, leave the earth, as long as you get rid of the gravitational pull of the earth

In order to fly out of the earth and out of the earth, you must have a speed faster than the first cosmic velocity, and the first cosmic velocity must be faster than this speed in order to fly out of the earth.

As long as it's fast enough, what you throw can fly off the earth? After reading it, I was dumbfounded.