Why a spacecraft is subjected to force in spaceflight is not to say an object

There is no object in the universe that is not subject to force.

Encyclopedia: Inertia, the property of an object to remain at rest or in a state of uniform linear motion, known as inertia. Inertia is an intrinsic property of an object, which is manifested as a degree of resistance of an object to a change in its state of motion, and mass is a measure of the magnitude of an object's inertia.

When the external force acting on the object is zero, the inertia is manifested as the object keeping its state of motion unchanged, that is, keeping it at rest or moving in a straight line at a uniform speed; When the external force acting on the object is not zero, inertia is expressed as the degree of difficulty with which the external force changes the state of motion of the object.

We know that any matter is magnetic, so any matter will be affected by magnetic force in an inhomogeneous magnetic field (1) Because any matter is magnetic, there are magnetic fields everywhere in the universe (inhomogeneous magnetic fields such as the sun, the Milky Way, etc.), and matter will be subjected to magnetic force in inhomogeneous magnetic fields, therefore, there are no objects in the universe that are not subject to magnetic force (force).

The theory of the expansion of the earth holds that because there is no object in the universe that is not subject to magnetic force (force), if the net force experienced by the object is zero, the object has a state of rest; If an object is subjected to a constant force, the object remains in a state of constant motion in a straight line.

2), search: magnetic induction intensity, 4 dimensions, (unit: t), the surface of the nucleus about 10 12;The surface of the neutron star is about 10 8;Interstellar Space 10 (-10); Human surface 3*10 (-10).

SpaceshipThe dynamics of the movement in space ** are:Reaction forceThe way it moves may be different from that of the Earth.

According to the plan, the astronauts of the space station will work about six and a half hours a day, with about two and a half hours for exercise and eight and a half hours for sleeping. Like all of us, they always squeeze in some time after work to have some entertainment. Walter Sibes, a NASA psychologist who specializes in long-term space research, said these activities, while secondary, are useful for maintaining a good mental state.

They don't have a sports locker, so they have to pack their sports gear.

In addition to space treadmills and stationary bikes, they also play gravity-free basketballs, frisbees and boomerangs.

and several sports that have to be named. It's just that in a gravity-free environment, they have to change the rules of the game.

Form the background. In order to make the most of the precious time in space, some astronauts are using their brains to think about some feasible space sports in the future. Garrett Riesman, an American astronaut who is now working on the space station, said that sometimes they just had a whim.

We started fiddling with large hydration bladders filled with water like we did with fitness balls to simulate an aerial baseball game. We recognize that movement is a big deal. However, he said he had to relearn how to throw the ball vertically.

The former commander of Expedition 16, Peggy Whitson, and 2 other colleagues had a different plan, organizing six astronauts from the Expedition 16 and 17 teams to hold an air relay race. "We started at one end of the capsule, then the people waiting at the second and third capsules followed, and then we sprinted back one by one," Whitson said.

So it's very interesting. The result was that she and Riesman's group won the game.

In space, because there is no air, there is no resistance, so as long as the object is given an initial force, the object will move in a fixed direction in a uniform straight line without the influence of other external forces; As for the magnitude and direction of the velocity, it depends on the magnitude and direction of the initial force; After that, as long as no resistance is applied to the object, the object will continue to move and will never stop.

1. When launching. The thrust of the rocket gradually accelerates from a stationary state to the first cosmic velocity. After reaching the first cosmic velocity, the spacecraft operates reliably by inertia.

2. When changing tracks. If the spacecraft needs to change orbit, it also needs thrust. There is no air in space, but the ship can be powered by the thrust of the Spitfire.

3. When decelerating. The spacecraft returns to the atmosphere until it lands, requiring a reverse drag force to reduce its speed. Part of this resistance is natural in the air, and the other part is artificial, such as using a parachute to slow down, but it can also be created by a reverse spitfire (mainly in the final stage).

1.Before a spacecraft enters orbit in space, it relies on the fuel in the spacecraft to produce material as a thrust reversal to adjust its direction.

2.When the spacecraft enters the predetermined orbit, because it is in a vacuum, there is no resistance, only the gravitational pull of the earth, so it can maintain the original speed and fly around the earth.

3.The speed at which a spacecraft flies around the earth in space is the first cosmic velocity, that is, the launch speed that the spacecraft must have when moving in a circle along the earth's surface, also known as the orbiting velocity, which is denoted as v1.

4.According to the theory of mechanics, it can be calculated that v1 = 9 kilometers per second.

5.However, in accurate calculations, the gravitational pull of the Earth on the spacecraft is slightly smaller than that on the ground, so its velocity is slightly less than V1.

1. Spaceship.

Before entering the flight orbit in space, it relies on the material produced by the leather fuel in the spacecraft as a thrust reversal to adjust the direction. When the spacecraft enters the predetermined orbit, because it is in a vacuum, there is no resistance, only the gravitational pull of the earth.

So it can keep its original speed and fly around the earth.

2. The speed at which a spacecraft orbits the earth in space is the first cosmic velocity.

That is, the launch speed that the spacecraft must have when moving in a circle along the earth's surface, also known as the orbiting velocity, is denoted as v1. According to the theory of mechanics, it can be calculated that v1 = kilometers and seconds. However, in accurate calculations, the spacecraft is orbiting at an altitude of several hundred kilometers above the surface of the ground, and the gravitational pull on the spacecraft in front of the Earth is slightly smaller than that on the ground, so its velocity is also slightly less than V1.

When we think of spaceships, we immediately think of the futuristic world of science fiction**, and in this fictional world, spaceships are depicted as fulfilling all sorts of surreal missions. However, in reality, if you've ever played the well-known game podcast** (PS4), you'll find that even the most technologically advanced spaceships face extremely difficult voyages with infinite limitations. Here we will talk about things that cannot be achieved in a spaceship.

First, let's imagine one of humanity's basic needs in a spaceship: breathing. In fact, oxygen does not exist in space, so astronauts must rely on special air circulation and oxygen regulation to survive.

Even now, astronauts need to be trained to adapt to this extreme environment. So, we can conclude that in a spaceship, breathing cannot be done without air**.

Secondly, the fuel of the spacecraft is also an extremely important issue. Because spacecraft need to operate independently in space for months, if not years, we need to have a reliable fuel**. However, regardless of the fuel used, the voyage will become slower and slower, or eventually it will stop running because it runs out of fuel.

Therefore, the guarantee of the Burning Tone Forest** is a limitation that can never be completely overcome.

Finally, the biggest limitation of a spacecraft is the gravitational pull of the Earth. Before going into space, the gravitational pull of the Earth must be circumvented using bonding orbits or other methods. Otherwise, the spacecraft will be trapped in Earth's gravity and will not be able to enter orbit.

But even this method ultimately needs to obey the Earth's gravity. Therefore, the gravitational pull of the earth can be seen as an insurmountable constraint.

In short, the spaceship is an extremely complex system of clearing acres, which is subject to numerous constraints and limitations. While we are now able to go into space and complete a variety of tasks, there are still some things that are not possible with spaceships.

Objects moving in a circle around the earth are subjected to gravitational attraction to provide centripetal force, and they are in a state of weightlessness rather than not being attracted by the earth

So the answer is: nothing

Hehe, the problem is very simple: first of all, it will emit some gas after burning itself, and the subsequent gas will be sprayed on the basis of the previous gas and it can fly (at this time, it is accelerated)), and in the approximate ideal state of space, flight does not need energy to maintain a uniform linear motion, I hope to solve your doubt.

It's not that there is no air in the universe, it's that there is no oxygen.