General relativity of civil science

Title Party? 2333 in fact, should be the special relativity science? Anyway I don't believe $\sum_{n = 1}^{+\infty} \frac{1}{n} < 400$ 's

I had a deep feeling after reading the Feynman physics handout ... Prepare to write a "self-summary", where readers can take part of the interesting content to put X on others

1. What is special relativity

$ $m = \frac{m_0}{\sqrt{1-v^2/c^2}} \tag{1}$$

Where $m_0$ represents the mass of an object at rest, $c $ represents the speed of light.

"If you want to install X, you can say this is special relativity."

This is Einstein's amendment to Newton's second law of Newton.

$ $F = \frac{d (mv)}{dt}$$

Newton originally thought that regardless of how the object moves its quality must be constant, in fact, from $ (1) $ know, the larger the speed of the object, the greater the quality.

But the quality of the correction at low speed can be almost negligible, so it can be said that the original Newton's understanding is not a big mistake.

First look at an interesting example, take $v=c$, then $m*0=m_0$, that is, $m_0=0$, that is, the speed of light object is not quality. This thing is a photon.

2. Rotation and movement of the coordinate system

For convenience, all rotational translations are performed only in the simplest case.

2.1 Rotation of the coordinate system

For example, transform from $x-y-z$ coordinates to $x '-y '-Z ' $ coordinates, where the $z$ axis is unchanged, and the rotation angle is counterclockwise on the $x-y$ plane $\theta$

So a point on the original coordinates $ (X_0,Y_0,Z_0) $ and the new coordinates on the point $ (x_0 ', Y_0 ', Z_0 ') $ relationship for

$ $x _0 ' = x_0 Cos\theta + y_0 sin\theta$$

$ $y _0 ' = y_0 cos\theta-x_0 sin\theta$$

$ $z _0 ' =z_0$$

2.2 Translation of the coordinate system

For example, the transformation from $x-y-z$ coordinates to $x '-y '-Z ' $ coordinates, where the $y$ axis $z$ axis is unchanged, $x $ axis shifts $a$ units to the right,

So a point on the original coordinates $ (X_0,Y_0,Z_0) $ and the new coordinates on the point $ (x_0 ', Y_0 ', Z_0 ') $ relationship for

$ $x _0 ' = x_0-a$$

$ $y _0 ' = y_0$$

$ $z _0 ' = z_0$$

These two things look very simple, is a simple high school competition "high" "test" content ... It leads to something more complicated.

General relativity of civil science