How long does the earth rotate

The time of the earth's rotation is 23 hours 59 minutes 04 seconds

The rotation time of 90 degrees is 0.5 seconds, the required starting time is 0.2 seconds, the deceleration time is 0.2 seconds, and the middle constant speed is 0.1 seconds. How to calculate the angular acceleration
Please write the calculation process,

Rotation angle: θ = π / 2, time t = 0.5s, starting time, deceleration time T1 = T3 = 0.2S, middle uniform speed T2 = 0.1s
It can be seen that the value of the acceleration of the moving angle is the same as that of the deceleration angle, and it is set as α
ω 1=αt1=0.2α rad/s
ω 2=-αt3=-0.2α rad/s
θ1=θ3=1/2αt1^2=0.02α rad
θ2=ω 1t2=0.02α rad
From θ = θ 1 + θ 2 + θ 3
π/2=0.02α +0.02α+0.02α
The solution is: α = 25 π / 3 rad / S ^ 2
So the starting angular acceleration is 25 π / 3 rad / S ^ 2, and the deceleration angular acceleration is - 25 π / 3 rad / S ^ 2
The average angular acceleration is: α = π / 2 △ 0.5 ^ 2 = 2 π rad / S ^ 2

If it takes 0.8 seconds for the wheel to rotate for the first turn after start-up, calculate the average angular velocity within 1 second after start-up

Let pi = Pi
According to the integral: degree = (0 T) KT ^ 2DT = 1 / 3 * k * T ^ 3
T = 0.8 degree = 2 * PI, so k = 375 * pi / 32
Within 1 second, degree = 375 / 32 * pi * 1 / 3 * 1 ^ 3 = 125 / 32 * pi

What is the relationship between the time when the moon rotates once and the time when the moon rotates once around the earth?

This should only have a numerical relationship
And there's not much cause and effect
It's the same time as the earth's rotation and revolution

What is the relationship between the time that the moon rotates once and the time that the moon rotates once around the earth?

The moon revolves around the earth at the same time, with a period of 27.32166 days, which is exactly a stellar month, so we can't see the back of the moon. This phenomenon is called "synchronous rotation", which is almost the general rule of the satellite world. It is generally believed that it is the result of the long-term tidal action of planets on satellites. Libration is a very wonderful phenomenon, It allows us to see 59% of the moon's surface
1. In different parts of the elliptical orbit, the rotation velocity does not match the common angular velocity
2. The angle between the white road and the equator

What is the relationship between the time of one revolution of the moon and the time of one revolution of the earth

The moon rotates 27.32166 days a week
It takes 27.32166 days to circle the earth
Under the long-term tidal effect of motherhood on satellites, the periods of revolution and rotation of satellites tend to be close to each other until they are equal

It can be seen from this that what is the time for the moon to rotate one circle and the time for the earth to rotate one circle

Equal

What is the correct definition of rotation in primary school mathematics?

The graphic transformation of a figure rotating an angle around a certain point O is called rotation. That is to say, rotation is the phenomenon that an object moves in a circle centered on a point or an axis, and it does not necessarily need to move in a circle. Therefore, swing is also rotation, so the motion of swing, pendulum and seesaw is swing and rotation

What is the meaning of class defined properties in Java

This is a variable or constant such as a string, value, list, map, etc. defined in the class / * * * / this is the manager class * / public class manager {string user name = Zhang San "; / / define an attribute of the manager class string password = 0000; / / define Manag

What are the characteristics of the sun

It's extremely hot, but there's a problem that people ponder. The temperature of the sun's interior and corona is very high, but the temperature of the sun's surface is far lower than the former two

How long does the earth rotate