The trajectory of the movement of God 7

FYI: 1. Before the spacecraft flies out of the earth, it moves in the direction of the earth's rotation, so that with the help of the speed of the earth's rotation, in this process, the power and resistance of the spacecraft are changing, not uniformly accelerating; 2. What kind of motion does the parabola you are talking about? Projectile motion?

I do not quite understand; 3. After the spacecraft flies out of the earth, it first moves along an elliptical orbit, which does not require additional power, and the speed is maximum at the perigee of the orbit and the minimum velocity at the apogee. Usually the spacecraft ignition at apogee and acceleration to a predetermined orbit (orbit higher above the ground or circular orbit), ignition at apogee is with the help of the spacecraft's inertia, where fuel can be saved; 4. Each orbit corresponds to a speed, the higher the orbit, the greater the speed, so after the spacecraft is launched, it is generally accelerated to the predetermined orbit, if it reaches a very high orbit at the beginning, and then wants to return to the predetermined orbit, it must slow down, wasting fuel; 5. When the spacecraft returns to the earth, it only needs to slow down, because the smaller the speed, the smaller the corresponding orbital height, and when the centrifugal force is less than the earth's gravitational force on it, it will be "sucked" back by the earth. 6. The process of the spacecraft returning home is that the gravitational potential energy of the spacecraft is converted into kinetic energy in the process of landing, and the speed of the spacecraft increases, at this time, several parachutes need to be opened in turn to slow down, until the spacecraft is a few meters away from the ground, the thrust reverser engine is started, and the spacecraft is finally decelerated to make it land smoothly.

Option b, a When applying the law of gravitation and uniform circular motion, the mass of the spacecraft will always be eliminated c The spacecraft will enter the atmosphere and rub violently with the air, and the mechanical energy will be converted into internal energy, and the mechanical energy will not be conserved. d The spacecraft will accelerate into a higher orbit and will not dock, and the reason why it enters a high orbit is because its velocity increases, and the gravitational force is less than the centripetal force that does circular motion, so it does centrifugal motion. It's high school, haha, I just graduated this year.

FYI: 1. Before the spacecraft flies out of the earth, it moves in the direction of the earth's rotation, so that with the help of the speed of the earth's rotation, in this process, the power and resistance of the spacecraft are changing, not uniformly accelerating;

2. What kind of motion does the parabola you are talking about? Projectile motion? I do not quite understand;

3. After the spacecraft flies out of the earth, it first moves along an elliptical orbit, which does not require additional power, and the speed is maximum at the perigee of the orbit and the minimum velocity at the apogee. Usually the destruction of the spacecraft ignition at the apogee and acceleration to a predetermined orbit (higher orbit or circular orbit above the ground), ignition at the apogee is to use the inertia of the spacecraft, where fuel can be saved;

4. Each orbit corresponds to a speed, the higher the orbit, the greater the speed, so after the spacecraft is launched, it is generally accelerated to the predetermined orbit, if it reaches a very high orbit at the beginning, and then wants to return to the predetermined orbit, it must slow down, wasting fuel;

5. When the spacecraft returns to the earth, it only needs to slow down, because the smaller the speed, the smaller the corresponding orbital altitude, and the centrifugal force is less than the earth's gravitational force on it, and it is "sucked" back by the earth.

6. The process of the spacecraft returning home is that the gravitational potential energy of the spacecraft is converted into kinetic energy in the process of landing, and the speed of the spacecraft increases, at this time, several parachutes need to be opened in turn to slow down, until the spacecraft is a few meters away from the ground, the thrust reverser engine is started, and the spacecraft is finally decelerated to make it land smoothly.

7. If it's not good or if you have any questions, just raise it, and I will do my best for you.

All the ships.

After launch, once it enters the stabilization phase.

will do a uniform circular motion around the earth, at which time the gravitational force of Nianbi acts as a centripetal force, and no energy is required to maintain it. The spacecraft is first launched from the ground to a predetermined position in the high altitude, and in this orbit does a circular motion around the earth, which is a first-stage orbit, and then when it reaches a specific position, the hail lifts the body to adjust the posture and power, and changes the orbit to an elliptical orbit, which is the second orbit, when it reaches the predetermined position again, adjusts the posture again to change the orbit to a circular orbit, and then there is no need to maintain power, only the third orbit. All satellite launches are carried out in such three processes, i.e., energy-saving and accurate.

Second, the spacecraft also needs to retain part of the energy in order to.

The ship's ** prepares the necessary energy.