A few questions about spacecraft flights, a few questions about spacecraft

In space, you still have to keep pushing, because there is a gravitational force, and if you don't push it, it will deviate.

1 is not valid, so 23 questions are not needed.

There is no friction in the vacuum in space, the only thing that has an impact is gravity, you must accelerate to a sufficient speed to get rid of the shackles of gravity, otherwise you can only be sucked back to accelerate and fly out to slow down and orbit.

Your argument is valid at low velocities (relative to the speed of light), but the relativistic effect should be taken into account when the velocity increases, the greater the relative velocity, the greater the apparent mass, the smaller the acceleration produced by the thrust, and the speed of light will never be reached by the formula.

The second floor understands a lot of points

Although it is said that there is a vacuum in space, it is actually not, and there are many 'impurities' (generally ignored)! If there is no more power in space, then he may have 1 day to stop, but it will be ...... for a long time

I don't know if you've ever heard of the term 'space sailboat'. This is also a hypothesis of scientists at present. Space is too big, and if you want to 'go out' for a long time, you need to bring a lot of fuel.

Scientists have imagined a space sailboat based on a sailboat, and it is possible to use a large sail to drive the spacecraft like a ship at sea. There are many ideas among scientists at the moment, and I would like to say one of them.

Install a super-large parachute-like 'sail' on the spacecraft! Turn it on again when you're in outer space. The material of the 'sail' is special, which can gather the energy of the sun's rays, and this energy can 'blow' the 'sail' and run forward to drive the spacecraft!

And this method also has the advantage of 'infinite acceleration', because in space there is a vacuum, if you keep adding propulsion, then the speed will accumulate infinitely, theoretically it will exceed the speed of light, but this is only a theory

A lot I didn't go into detail, I also found another idea on the Internet for you to see.

1: I don't think the question of whether space is a vacuum or not seems to have no argument value, and the answer is no. Space is close to a vacuum, so there is basically no drag (excluding the gravitational pull of massive objects), so as long as the spacecraft has an initial velocity and no power, the spacecraft can continue to fly in a straight line at a uniform speed.

2: Just because the above question is true does not mean that this question is also valid. First of all, if you want to maintain a constant speed, you don't need power, but to keep flying at a constant speed, you must have a continuous power.

Secondly, even if there is a large amount of continuous power, it is absolutely impossible to make the spacecraft continuously accelerate to the speed of light or even beyond, for reasons I will talk about in the next question.

3: The example of the bicycle has been said by netizens, and the reason why it does not explain the problem is because of friction.

Without further ado, let's start with two formulas. The inertial mass formula: m=m0 (1-v2C2), m is the inertial mass, m0 is the rest mass, v is the velocity, and c is the speed of light.

The formula for the applied force: f=ma, f is the applied force, m is the mass of inertia, and a is the acceleration. (307761682 seems to be wrong, this formula is not limited to classical mechanics.

Let's use these two formulas to analyze: assuming that the spacecraft is always accelerated with acceleration A, the power required to increase the speed of the spacecraft from zero to V in a certain period of time is F, and as the speed of the spacecraft increases, its inertial mass becomes larger and larger, so the power required to increase the speed of the spacecraft from V to 2V in the same time is greater than F, and the acceleration continues to ...... 3V and 4VThe power required increases until the speed approaches the speed of light, the ship's inertial mass tends to infinity, and so does the power required. If the spacecraft reaches the speed of light, the force required to accelerate it again is infinity.

It is simply not possible for the force to tend to infinity or to reach infinity.

Certainly not a meaning.

In the beginning, you are right, there is no friction in the vacuum, if the object is in a state of uniform motion in an empty space, you don't have to do anything to it, it will always do a uniform linear motion on its own;

Then, after accelerating for a period of time, the acceleration is no longer accelerating, and the object continues to move in a straight line at the last velocity;

However, when you use the example of a bicycle, the problem is that the bicycle has friction, and when the speed is higher, the friction power is greater, so whether you ride fast or slow, you will reach a state of equilibrium, and the friction power and your output power are equal. So the bicycle example cannot be used as a metaphor for the situation in space.

The crux of the matter is what exactly is the "size" of this thrust? It's x for the person being accelerated, but isn't it x for the person who is stationary outside? In addition, the higher the velocity of the object, the greater the energy and the greater the mass, the more difficult it will be to accelerate.

1. Theoretically, it is possible, but generally we cannot directly give the spacecraft a large enough muzzle velocity, on the one hand, the thrust is insufficient, and on the other hand, the excessive acceleration makes the spacecraft and astronauts unable to bear it.

2. A spacecraft that flies in space at will requires a lot of fuel, as well as a variety of communication and monitoring and navigation systems. If you fly too far, the requirements for these equipment will increase exponentially, so most of the spacecraft that fly to the outer solar system (such as Cassini, Voyager, etc.) go through strict orbital calculations and control, and go through the accelerated ejection of large planets to go that far.

3. I think this is for the sake of space, after all, with the same material, the spherical spacecraft has the largest space, and the models of various dynamics and fluid mechanics are relatively clear. Now human technology is not enough to build a spaceship in a science fiction movie. But the American space shuttle is already very advanced.

4. The space shuttle has its own power, because it involves changing orbit in space and flying in the atmosphere when returning, and it will not work without power.

Hope it helps.

1. Theoretically, "the spacecraft can fly around the earth with only one initial velocity", but due to the drag of space particles and air molecules escaping from the atmosphere, power is still needed to maintain orbit. In addition, power is needed for work and life such as cabin lighting, as well as the power to change orbit when returning. So with a pair of wings (solar sail panels).

2. Flying at will must make the power of the aircraft strong enough to change orbit at will, and now the solar energy conversion technology is not up to the situation, to fly at will must carry more fuel, which consumes energy on the one hand, is dangerous on the one hand, and reduces the transportation capacity of the spacecraft on the other hand.

3. The cone can minimize the air resistance during launch. The space shuttle is not round, but this causes a significant increase in energy consumption at the time of its launch, which does not save energy.

4. Any spacecraft has power**, mainly solar sail panels, and the surplus fuel at launch.

During the launch phase, the main factor that occurs in the thruster** is fuel leakage. The leakage points mainly include container sealing materials, pipes, and valves.

Other causes include abnormal operation of the pump body, program errors, cracks caused by changes in part materials and machining accuracy, stress, and temperature.

Natural wear and tear is not a major factor, as the thruster is designed for a very short period of time, typically only a few minutes, and is designed with the material in mind at high speeds.

Fuel leakage should be the main cause.

The natural wear and tear of the equipment should not be the main reason, and it is more reliable to look at the high temperature and accidental detonation of fuel caused by attitude adjustment in the atmosphere rather than natural wear.

The hydraulic system of the fuel tank is clogged.

The head of the Russian Space Agency, Vladimir? Popovkin confirmed on Thursday (16th) that the "Breeze-M" thruster malfunctioned due to manufacturing problems, which led to the failure of the "Proton-M" rocket launch.

On August 7, the two communications satellites "Express-MD2" and "Telecom-3" could not be put into orbit due to the failure of the "Breeze-M" thruster, which led to the failure of the launch of the Proton-M rocket.

"The interdepartmental commission began its investigation on August 7 and took 10 days to find out the cause of the accident, mainly a blockage in the hydraulic system of the spare fuel tank of the Breeze-M thruster," Popovkin said. ”

He also said that there is no basis for the claim that the Breeze-M thrusters may have occurred in non-scheduled orbits, and that the thrusters would not have occurred in orbits.

If it is a thruster** then there are a few possibilities.

1 Leakage Factor You also mentioned that this is also one of the reasons.

2 The device for the thrusters to receive the direction (different for each spacecraft, I can't name it exactly) went wrong and caused the spacecraft to dance ballet in the sky.

3 Push it hard enough to fly halfway down from the sky and shatter It is also possible.

4. Pressure control If the pressure control system is not in place, the pressure difference between the inside and outside will be too large.

Basically, let's ask questions if you have any questions about these four articles.

It is generally caused by leakage.

A light-year is a unit of length, which is the distance that light travels in a year at a speed of 300,000 kilometers per second.

Your spaceship is at the speed of light, and it will take 1,200 years to reach 1,200 light-years away.

1,200 light years is 1,200 years at the speed of light, and you probably won't be able to reach it in a week. That's many times faster than the speed of light. If it does arrive in a week, you can postpone the arrival date a bit to allow enough time to slow down.

It seemed to the people on the ship that time passed unhurriedly.

The particles are attached to the spacecraft, which means that the micro-punching rubber grains gain a velocity of 2000 meters per second. The momentum gained by the particles comes from the thrust of the engine.

ft=mvm=svtρ

f=sρv^2

According to m=m0 [ 1-(v c) 2], when v = c, the spacecraft mass becomes infinity. In the same way, t=t0* [1-(v c) 2], when v=c, time on the spacecraft will stand still, which means that a person travels around the speed of light, and countless years have passed on the earth, and the traveler is still so young.

As for why there will be no light-speed vehicles, even particles cannot be accelerated to the speed of light, because with the increase of v, the mass of the particles will increase, according to e=, the energy required for acceleration will become larger and larger, when v is close to c, the mass tends to infinity, and the required energy tends to infinity, and human beings cannot obtain infinite energy, you understand, so they cannot reach the speed of light, at most close to the speed of light.

Several important conclusions of special relativity are the relativity of time and the relativity of mass, that is, when the velocity of the object relative to the reference frame increases, the time flow velocity of the object and the mass relative to the reference frame will slow down and increase respectively. This effect becomes more and more pronounced as the speed approaches the speed of light. When an object moves close to the speed of light, the mass will become very large, so theoretically an infinite thrust is required to accelerate to the speed of light, which is unrealistic.

At the speed of light, a second has passed on the spacecraft, and hundreds of millions of years have passed in the outside world.

1) In the process of accelerating the spacecraft, its speed increases and its kinetic energy increases; The height of its Qizheng increases, and the gravitational potential energy increases; So the mechanical energy increases; Deficit (2) Although the astronaut's position has changed, the quality will not change; Therefore, the answer is: increase; No change