How to calculate power

1. 1. The computing power of mobile phones now exceeds that of the Apollo spacecraft of the United States at that time
2. The computing power of desktop computers using mobile phones requires the support of hardware and software
3. If you are interested, you can study SETI's software and use computer computing resources all over the world to search for aliens

2. 1、 Lever
(1) basic concept of lever
a hard rod that can rotate around a fixed point under the action of force is called lever
there are five terms of lever: ① fulcrum: the point around which the lever rotates (o); ② Power: the force that makes the lever rotate (F1); ③ Resistance: the force that prevents the rotation of the lever (F2); ④ Power arm: distance from fulcrum to action line of power (L1); ⑤ Resistance arm: distance from fulcrum to resistance action line (L2)< (2) the condition of leverage balance × Power arm = resistance × The resistance arm, the equilibrium condition, is the lever principle discovered by Archimedes< (3) three levers:
1. Labor saving lever: L1 & gt; L2, F1 & lt; F2 The feature is labor saving, but it costs a lot of distance (e.g. iron scissors, guillotine, driver)
② lever: L1 & lt; L2, F1 & gt; F2 The characteristic is laborious, but saves the distance (e.g. fishing rod, barber scissors, etc.)
③ equal arm lever: L1 = L2, F1 = F2 when balancing. It is characterized by no effort and no effort Such as: balance)
2. Buoyancy
(1) buoyancy
the upward force of liquid or gas on an object immersed in liquid or gas is called buoyancy. The cause of buoyancy is: the object immersed in liquid (or gas) is subject to the upward and downward pressure difference of liquid (or gas). Buoyancy is applied to liquid (or gas), buoyancy belongs to elastic force
(2) Archimedes principle
an object immersed in liquid is subject to upward buoyancy, which is equal to the gravity of the liquid it displaces. Expression: F = g row= ρ Liquid V discharges g (Archimedes principle also applies to gas)
it can be concluded that the density of the liquid and the volume of the liquid displaced by the object are two factors that affect the buoyancy< (3) the calculation method of buoyancy
① Archimedes principle: F floating = g row= ρ Liquid V row g (also suitable for gas)
② two force balance: F floating = g object (suitable for floating and suspension)
③ multi force balance: F floating = G-F (this is the case of measuring buoyancy with a spring dynamometer)
④ pressure difference method: F floating = f up-f down (not commonly used)
(4) measurement of buoyancy
① common method: measure the gravity g of an object with a spring dynamometer, When an object is immersed in the liquid and the indication F of the spring dynamometer is read out, the buoyancy of the object immersed in the liquid is: F floating = G-F< (2) measuring v-row (measuring cylinder) method: measure v-row and use f = g-row= ρ The buoyancy of liquid V row G is calculated
(5) the buoyancy and sinking conditions of objects are determined by the relationship between gravity and buoyancy. ① When gravity is greater than buoyancy, the object sinks; ② When gravity equals buoyancy, the object floats; ③ When gravity is less than buoyancy, the object floats< (6) utilization of buoyancy
1. Ship: hollow method is used to increase the available buoyancy, so that the ship can float on the water. The size of a ship is expressed in terms of its displacement - the mass of boiled water discharged when it is fully loaded
② submarine: submarine floats and sinks by changing its own gravity
③ balloons and airships: both use the buoyancy of the air to work. Balloon and airship lift, mainly by changing the volume of the airbag to change their own buoyancy to achieve.

3. It is recommended that you choose a 45 degree angle, because both the horizontal distance and the vertical height are the best
let me share my skills
45 degrees, full screen distance
no wind, no height difference, the force is about 50. After that, according to the factors of each small screen distance and wind direction, increase or decrease the intensity by about 10
65 belongs to half height throwing, which is not very easy to use, because high throwing is very affected by the wind, so it is recommended that the building owner shoot at a 45 degree angle
as for the experience and the so-called feeling, you can have two more
pure hand fighting, hope to adopt it~~~~~~~~~~

4. Torque (torque) = power (kw) / speed * 9550 = 7Nm or so
because you only have one motor, so the power remains unchanged. After the speed change gear, the speed becomes 1 / 10 of the original, so your torque also has to be 1 / 10 of the original, about 0.7nm or so,
personal opinions, primary school diploma, if you have any help, please thank you!

5.

When calculating the force, it has nothing to do with whether the lever is bent or not

because the arm of force is the distance from the fulcrum to the action line of the force, which has nothing to do with the shape of the lever. Finding out the arm of force can be calculated according to the lever balance condition. As shown in the figure below, the arm of force is the length of the dotted line, which has nothing to do with the shape of the rod

6. According to the empirical method for calculating the bearing capacity of single pile under vertical load, through the bearing mechanism of composite pile foundation with single pile and single pile cap under the action of pile cap, and based on the elastic theory, a formula for calculating the bearing capacity of composite pile foundation with low pile cap is proposed, The measured value is close to the calculated value. It is proved that the calculation method of bearing capacity of composite pile foundation established in this paper is feasible on the premise of considering the load sharing effect of pile cap and the increase of pile side friction and pile end resistance e to the effect of pile cap. It can be applied and referenced by engineering circles, and it can greatly save engineering funds with remarkable economic benefits

7. Master in each hand of chess, after the changes will be carefully calculated. Repeat the different changes in your mind like a slide show, and choose the best way to do it. Finally, you can get on the chessboard
children who have just learned chess often play chess very fast. What they care about is winning or losing. There are no changes in their eyes. They play mechanically by feeling. Developing this habit is certainly harmful to the improvement of chess power
therefore, it is very important to develop the habit of thinking when playing chess at the beginning stage. It's important to think about how the other side will play chess and how they should play next. The ability to analyze all kinds of changes in mind is the ability to calculate
in go, computational ability is a basic ability, so the cultivation of computational ability is the only way to improve chess power. The best way to cultivate the ability of calculation is to do the dead and alive questions and the hand problems. It can be said that the training of computational ability must run through the whole process of learning chess
for beginners, we should also pay attention to some methods to solve the problems of life and death and hand muscle. First of all, we should pay attention to the choice of difficulty, follow the principle of graal progress, according to their ability from simple to difficult. Secondly, when answering questions, do not know the answer in advance. Only on the premise of not knowing the answer, through the full analysis of various changes, can it play the role of exercise
besides, don't be afraid to make mistakes. The most important thing is the process of calculation. In the repeated exercise, summarize all kinds of experience, strengthen the feeling of all kinds of key points of chess. Calculation ability will be improved unconsciously in the process of exercise, so the accuracy rate will be improved naturally
experience the new blog

8. "Pressure" generally refers to "positive pressure", that is, the force acting in the direction perpendicular to the acting surface; When a force acts vertically on a surface, the force is the pressure on the surface, and the magnitude of the force is the magnitude of the force. For example, when a wooden block weighing 10N is placed on a horizontal desktop, the pressure on the desktop is 10N; Because the contact area between the wood block and the tabletop may be different, the average force of the 10N force divided into each unit of contact area is "pressure". It can be seen that when the contact area between the wood block and the tabletop is large, the pressure is small; Conversely, the pressure on a surface is equal to the proct of the area under action and the wall under pressure
and "buoyancy" is related to the density of liquid and the volume of liquid discharged by the object into the liquid. The buoyancy is equal to the proct of the volume occupied by the object in the liquid and the density of the liquid. In particular, the buoyancy of the object floating on the water is exactly equal to the gravity of the object.

9. You can refer to the V-T image. If you change f to V and X to t in the above figure,
then the displacement x is the area formed by this line and X axis.
similarly, w = FX is not the same as x = VT? So w is the area formed by this line and X axis
this area is trapezoidal, the upper and lower price plus the lower price multiplied by the height divided by 2...
the above is the analogy method

there is another explanation, which is integral.. After you learn the meaning of the integral of senior three, you will further understand it

10. △R/R=K* ε， Use this formula to calculate the strain, and then the stress = E* ε
e is the elastic molus of the measured object. If you are interested in the knowledge of strain gauge, you are welcome to chat with me,