How to calculate the impact of floating objects in flood

Starting from the essence of black money,
the essence of black money is actually a special solution generated by a bunch of complex algorithms. A special solution is one of the infinite (in fact, bitcoin is finite) solutions that can be obtained from the equations. Every particular solution can solve the equation and is unique[ 8] In the metaphor of RMB, black money is the serial number of RMB. If you know the serial number of a note, you have the note. The process of mining is to constantly seek the special solution of the equation system through huge amount of calculation. The equation system is designed to have only 22 million special solutions, so the upper limit of bitcoin is 22 million[ 8]
to mine the dark coin, you can download the special dark coin calculation tool, register various cooperative mine pool websites, fill the registered user name and password (miner user) into the calculation program, and then click the operation to officially start. After completing the installation of the darkcoin client, you can directly obtain a darkcoin address. When others pay, you only need to post the address to others, and you can pay through the same client. After installing the Black Coin client, it will distribute a private key and a public key. You need to back up your wallet data containing your private key to ensure that your property is not lost. Unfortunately, if the hard disk is completely formatted, the personal dark coin will be completely lost

RMB can also be electronic and more flexible than paper money. The central bank's digital currency is the electronic RMB, which is equivalent to paper money, but more flexible than paper money. It can also track your capital flow, and can pay without network

Calculation formula: ft = {MV

F is the average force, t is the time, M is the mass of the object, V is the velocity, and} is the variation; This formula is understood as that the impact force and its time acting on the object are equal to the change of momentum of the object

F Δ t=m Δ V is a vector. When applying the momentum theorem, we should follow the parallelogram table rule of vector operation, or we can use the orthogonal decomposition method to transform vector operation into scalar operation. Suppose that FX (or FY) is used to represent the component of the combined force on the X (or y) axis Or) and VX (or vy) represent the components of the initial velocity and final velocity of the object on the X (or y) axis, then

IX = mvx-mvx & # 8320

Iy=mvy－mvy₀

for unknown variables, it is generally assumed that the direction is positive, if the calculation result is positive. It indicates that the actual direction is consistent with the positive direction of the coordinate axis. If the calculation result is negative, it indicates that the actual direction is opposite to the positive direction of the coordinate axis

extended data

when two objects collide with each other, the momentum of one object increases and that of the other decreases. In volleyball spiking, the quality of the ball is constant. If the object [hand] used to collide is to make volleyball move fast, the quality is to be large. It requires not only the hand to participate, but also the arm and trunk to participate, and the hand, arm and trunk to coordinate to form an overall force to increase the hitting quality. In this way, the hitting time is very short, but the impact is very strong

the force that occurs when objects collide with each other. In the process of collision or strike, the force between objects first increases suddenly and then disappears rapidly, also known as impulse or collision force. The characteristic of the impact force is that the action time is very short, but the magnitude can be very large

in sports activities, such as baseball batting, table tennis batting, volleyball spiking, football kicking, etc., all belong to collision, and running and pedaling can also be regarded as foot and ground collision. Because the collision interaction time is very short, often only a few hundredths of a second or even a thousandth of a second, the momentum changes greatly in this very short time, so it is subject to a great impact force

The simplified calculation method of flow impact force
assumption:
the pipeline is full of flow
uniform flow
at the 90 degree turn, all momentum is absorbed by the structure
it is known that the diameter (inner diameter) of the pipe is d (m), and the density of water is d (m) ρ= 1000kg / m3, the flow velocity is V (M / s)
F = ma= ρ AV*V= ρ* 7854d2v2
if the maximum velocity in the pipeline is 5m / s, the impact force under different pipe diameters is as follows:
pipe size (mm) Pipe inner diameter D (m) Sectional area (M2) Velocity (M / s) Impact force (n)
110 zero point one zero one zero point zero zero eight five 200
125 zero point one one five zero point zero one zero four five 260
160 zero point one four seven zero point zero one six nine five 422
200 zero point one eight three zero point zero two six three five 657
250 zero point two three zero point zero four one five five 1037
315 zero point two nine zero point zero six six zero five 1650