What Is Motion Sensitivity?

In physics, the physical quantity is the expression of how fast an object moves relative to a reference object (usually the earth or the ground as a reference object). In physics, the motion velocity of a particle to the ground or to a stationary object on the ground is generally called the relative velocity; the motion velocity of a reference frame of the mass to motion is called the absolute velocity; and the motion velocity of the motion reference frame to the ground is called the implication velocity. Absolute speed = implicated speed + relative speed (because the speed is a loss, the above operations use vector synthesis. That is, the triangle rule or the square rule. But the above calculations have a scope of application, and this rule can only be used under macro low-speed conditions) in astrophysics In school, the classical formula of physics does not hold.

Speed of movement

(Physics subject concept)

in

The speed is equal to the moving object passing in unit time

v = v. + at (

International unit m / s or m · s-1

Common units in transportation: km / h or km · h-1

Conversion relationship: 1m / s = 3.6km / h 1km / h = 1 / 3.6m / s 0.28m / s, the movement can be divided into average speed, instantaneous speed and so on according to the speed classification. According to the direction of movement, it can be divided into

Horse racing, ice skating, etc. have fully demonstrated people's limits.

First speed of movement

(Also known as orbital speed): refers to the speed at which an object moves in a circular motion close to the surface of the earth (also the minimum launch speed of an artificial earth satellite). The magnitude is 7.9km / s-the calculation method is V = (gR), which is V = sqrt (gR) (g is the acceleration of gravity and R is the radius of the planet)

Speed of motion

(Also known as detachment speed): refers to the minimum initial speed required for an object to completely break away from the gravitational constraints of the earth and fly away from the earth. Magnitude is 11.2km / s

Third Cosmic Speed

(Also known as escape velocity): The minimum initial velocity required for an object launched on Earth to escape the solar gravitational restraint and fly out of the solar system. Its size is 16.7km / s.

Fourth Cosmic Speed

The so-called fourth cosmic velocity refers to the minimum initial speed required for objects launched on the earth to escape from the galaxy's gravitational constraints and fly out of the galaxy, which is about 110-120km / s, which refers to the speed required to sail in most places in the galaxy. . If the rotational speed of the solar system around the silver center is fully utilized, the minimum sailing speed may be 82 km / s. Since humans know very little about the Milky Way, this figure will take a long time to form a public opinion. Refers to the speed of separation required in most parts of the galaxy. The fourth universe velocity cannot be obtained at all, because the mass and radius of the silver core cannot be taken.

Fifth Universe Speed

The fifth cosmic velocity refers to the minimum velocity of the spacecraft launching from the earth and flying out of the local galaxy group. Since the radius and mass of the local galaxy group are not sufficiently accurate, the data size cannot be accurately known. Scientists estimate that the local galaxy group is about 5-10 million light-years. According to this calculation, it should take a speed of 1500-2250km / S to fly away, but this speed is at least a few hundred years to reach the level of scientific development of human beings. So just an illusion.