How swordsman digs mine automatically

1. Buy a Ding Dong sound to remind yourself

2. It should be done with dynamic programming

3. There are a lot of Internet projects, I can take you.

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5. Yes, but I can't make a lot of money. Of course, some people can take care of themselves.

6. Those zero investment network app are deceptive, it is impossible to gain without effort, proce benefits

7. No, there is no free lunch in the world. Don't trust others easily. It's deceiving to say that there is no risk!

8. Unknown_Error

9.

Knowing the pipe diameter and pressure, it is impossible to calculate the flow. However, it can be assumed that the loss of flow resistance is negligible, that is, when the compressed air flows to the nozzle, the pressure energy is all converted into kinetic energy × v) ρ/ 2 = P, i.e. P = 0.5 ρ V2

ρ--- Density

V2 --- velocity square

P --- static pressure

flow formula: l = AV, a is the cross-sectional area

the calculation principle is that, when designing in engineering, you can directly refer to the calculation table of compressed air pipeline

air occupies a certain space, but it has no fixed shape and volume. When pressure is applied to the air in a closed container, the volume of the air is compressed and the internal pressure increases

extended data:

when the external force is withdrawn, the air will return to its original volume under the action of internal pressure. If there is a movable object in the container, when the air returns to its original volume, the object will be pushed out by the pressure of the air in the container. This principle is widely used in proction and life

for example, when compressed air is injected into the ball, the harder the air is, the harder the ball is; When compressed air is injected into the tire, it can bear a certain weight. In large cars, compressed air is used to open and close doors and brakes; Hydraulic press uses compressed air to pressurize water. In the factory, compressed air is used to drive air hammer to strike iron; In coal mines, it can drill holes with pneumatic picks. It is also used for pipeline transportation of liquid and granular objects

10. BTC!