Something about a few physical paradoxes 90

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

Analysis: A paradox is a mistake that appears to be a mistake when it's not. The twin paradox is one of the most well-known paradoxes in special relativity.

Because according to the special theory of relativity, time in a moving object slows down, and when the motion reaches the speed of light, time stops. The twin paradox goes something like this: if there are twin brothers, one of whom is moving at close to the speed of light for a while and then returns, he will look younger than his non-moving brother.

But in fact, from a completely relative point of view, when this person is talking about sports, his brother is doing the same sports relative to him, so which one is older? Or is it just as old? I found that this was not a paradox, but a real error that could not be explained by the theory of relativity.

In the theory of relativity, each observer has his or her own measure of time. This can lead to the so-called twin paradox.

Let's give you an analogy, for example, you and your twin brother were born at the same time, suppose you are now on a space voyage, the speed of the spaceship is close to the speed of light (c), and your brother stays on Earth, because the speed is close to the speed of light, so in the eyes of the brother on Earth, your time has passed more absolutely, so when you return, you will find that he is older than the Rusher. While this may seem counterintuitive, a series of experiments have proven that you are indeed younger than your brother when traveling in this scenario.

In 1949, the famous philosopher K. Gödel argued that it is permissible to return to history and travel according to Einstein's theory of general relativity. But he also points out that there are some absurdities in between, such as: Is it possible for someone to go back to the time before he was born, kill his grandfather, and then go back to his old time?

Since his grandfather was dead before he was born, how could he have existed? Therefore, because of the existence of this paradox, scientists put forward a view of "parallel time and space", and this view is basically recognized by the scientific community, that is, time and space are not the only existence, but there are countless parallel existences of time and space, and they cannot be related to each other in general.

Each space-time evolves according to its own laws and in its own order.

It is also said that it is.

If each space-time exists in parallel, then the people who exist in that space-time do not necessarily exist in the other. In other words, you can't recruit your grandfather in another time and space, let alone kill him, since everything is very different, and the development and evolution are also different, and generally cannot be connected, nor can it affect our own time and space, then it can't be regarded as a return to the past at all. At most, even if it is a trip to another planet or a country, how can it be called a return to history.

The energy produced due to the motion of an object is called kinetic energy. Then the magnitude of the kinetic energy is related to its velocity, more precisely, it is related to the relative velocity of the moving object and the selected frame of reference, the faster the relative velocity, the greater the kinetic energy. Again, in the example you gave, the car is stationary, and the damage caused by being hit by an airplane is of course less than that caused by a head-on collision, which means that the kinetic energy of the aircraft is greater in the latter's frame of reference.

Then it is simple to consider the problem next, the comparison of the inertial parameters of different reference frames is meaningless, just like Guan Gong and Qin Qiong, and if you want to be meaningful, you must take into account the changes in the reference frame. As shown above, the inertial reference quantity should be introduced as follows: 1 2m[(300-100) 2-(200-100) 2], and the energy will be the same as the previous one.

If you are studying, it is good to remember that the quantities of different reference frames cannot be directly compared.

In both scenarios, the aircraft is fundamentally in two frames of reference. Wouldn't it be more fierce if the car was replaced by a satellite? In the second frame of reference, in order to convert the frame of reference, the speed of the aircraft should be subtracted from the speed of the car, and it is the same.

What a fallacy this is!! I'll go!!! In terms of kinetic energy, you can only use the ground as a reference, and you belong to the concept of stealing!!

I'll tell you the truth!! Think about it, for example, if the mass and force of your car and plane are the same!! Both of them interact with the ground, you know.