Why Einstein s equivalence principle makes sense

Einstein used this as a breakthrough to boldly propose the famous equivalence principle on the basis of two rounds of equal mass: a non-inertial frame with an acceleration of a is equivalent to an inertial frame with a uniform gravitational field. In other words, the motion seen by an acceleration system is exactly the same as that seen by a nucleus-making inertial system with a gravitational field.

Einstein also illustrated this equivalence principle with a special "aerial elevator experiment". The discovery of the "principle of equivalence" was considered by Einstein to be the most enjoyable event of his life. On the basis of this principle, he finally came up with a satisfactory "generalized covariant principle":

The mathematical form of the laws of physics is the same in any frame of reference. In this way, he extended the principle of relativity from the pure and inertial frame to the non-inertial frame, and established the general theory of relativity on the basis of the special theory of relativity.

Einstein used a hypothetical experiment to illustrate: in the distant depths of the universe (inertial reference frame), there is a sealed spacecraft accelerating upwards in the + z direction with an acceleration of 2, suppose there is an astronaut and a shot put ball in the sealed spacecraft, the astronaut picks up a shot put ball in the spaceship, and he feels that the lead ball has weight; Not only that, but he also felt that he had weight, and he believed that there were two possibilities: one was that the spacecraft was accelerating upwards in the + z direction (relative to the astronauts) in space, and although there were no planets or gravitational fields nearby, the astronauts would still feel a tendency to fall due to the relationship between the shot put and their own inertia, which was the inertial force.

Another possibility is that the spacecraft may be parked on a planet with a gravitational field strength of 1, which uses gravity to pull the shot put and itself, making it feel the weight of the shot put and itself.

In 1907, Einstein wrote a long article on the special theory of relativity, "On the Principle of Relativity and the Conclusions Drawn from It", in which Einstein first mentioned the principle of equivalence, and since then, Einstein's ideas on the principle of equivalence have evolved. Based on the natural law that inertial mass and gravitational mass are proportional to the mass of inertia and gravitational mass, he proposed that a uniform gravitational field in an infinitesimally small volume can completely replace the reference frame of accelerated motion. Albert Einstein also put forward the idea of a closed box

The most common way to explain the equivalence principle is that the observer in a closed box cannot determine whether he is at rest in a gravitational field or in a space without a gravitational field in accelerated motion, and the equality of inertial mass with gravitational mass is a natural corollary of the equivalence principle.

If the equivalence principle fails, then the ratio of the inertial mass of the same object to the gravitational mass is no longer constant, then the acceleration of objects of different masses falling at the same position in the gravitational field will be different, which means that gravity can no longer be regarded as a background geometric quantity, and the basis of general relativity is that gravity is essentially curved space-time, and gravity appears as background geometry in general relativity.

Therefore, once the equivalence principle fails, the general theory of relativity will be like a tree without roots and water without a source, and the entire theoretical system will collapse with a bang.

Which of the following groups is the object of Einstein's principle of incursion equivalence?

a.Acceleration vs. gravity.

b.Gravitational force and accelerated motion.

c.Overweight phenomenon with acceleration movement.

d.Gravitational force vs gravity.

Correct answer B

e=mc is equal to mc square. Argument

It is customary to use the formula e=mc to express the mass-energy equivalence, where c represents the speed of light, which is about 300,000 kilometers per second, e is the energy contained in a stationary object, and m is its mass. The energy contained in mass m is equal to this mass multiplied by the square of the tremendous velocity of light, i.e., each unit of mass contains tremendous energy.

Effect. This equation originated from Albert Einstein's study of the relationship between the inertia of an object and its own energy. The famous conclusion of the study is that the mass of an object is actually a measure of its own energy.

To understand the importance of this relationship, compare the electromagnetic force with the gravitational force. The theory of electromagnetism states that energy is contained in fields (electric and magnetic) that are force-dependent and charge-independent. In the theory of gravitation, voltive energy is contained in matter itself.

It is no accident that the mass of matter can distort space-time, but the particles of the other three fundamental interactions (electromagnetic, strong, and weak) cannot.