Is speed power
Publish: 2021-04-19 02:13:44
1. Is the first cooperation part still short of one sentence?
2. Newton's second law of motion: force = mass × Acceleration, force must know mass and acceleration
3. Computing power is trained. When we were in primary school, we didn't have a calculator. The topics were all written and oral arithmetic. In junior high school, when I had a calculator, I always used it. After a period of time, I found that my computing ability had declined. I put it aside
no matter how large the number is or how complex the operation is, you should insist on doing it yourself; I also like mental arithmetic. I don't need a pen to do it. For example, 18 * 37 can be 20 * 37 or 18 * 40
no matter how large the number is or how complex the operation is, you should insist on doing it yourself; I also like mental arithmetic. I don't need a pen to do it. For example, 18 * 37 can be 20 * 37 or 18 * 40
4. Smile and don't talk. Don't worry about it..
5. In fact, any problem can be overcome.
I think you can find some problems.
it must be problems with complex process and complicated calculation (such as the last step of Mathematics)
it is best to provide reference answers, Then you work on the draft paper step by step
until you match the standard answer
make a plan for yourself
for example, do a question one night
secondly, I think you should be calm when doing the question
sometimes say to yourself
write down step by step
don't worry
try to write clearly on the draft paper
finally
you can also do it Think about the mistakes you made in the past.
to sum up,
at least pay attention to this in the future.
finally, I wish you success in the college entrance examination.
after all, I don't think you should be too nervous about the college entrance examination.
as long as you do it step by step,
no matter how simple or difficult the test paper is,
you should have a good attitude.
you will definitely have a good score uck
I think you can find some problems.
it must be problems with complex process and complicated calculation (such as the last step of Mathematics)
it is best to provide reference answers, Then you work on the draft paper step by step
until you match the standard answer
make a plan for yourself
for example, do a question one night
secondly, I think you should be calm when doing the question
sometimes say to yourself
write down step by step
don't worry
try to write clearly on the draft paper
finally
you can also do it Think about the mistakes you made in the past.
to sum up,
at least pay attention to this in the future.
finally, I wish you success in the college entrance examination.
after all, I don't think you should be too nervous about the college entrance examination.
as long as you do it step by step,
no matter how simple or difficult the test paper is,
you should have a good attitude.
you will definitely have a good score uck
6. Set the inclination angle as α
normal pressure of object to inclined plane = mgcos α
(without drawing, you can also imagine a special position: α= 0, positive pressure = mg, α= 90º Positive pressure = 0, so it's cos α， And sliding force = mgsin α On the contrary)
sliding friction f = n· μ= mgcos α·μ， The direction of force is opposite to that of motion.
normal pressure of object to inclined plane = mgcos α
(without drawing, you can also imagine a special position: α= 0, positive pressure = mg, α= 90º Positive pressure = 0, so it's cos α， And sliding force = mgsin α On the contrary)
sliding friction f = n· μ= mgcos α·μ， The direction of force is opposite to that of motion.
7. Bearing vibration acceleration is an important index to measure the level of bearing manufacturing. It can be measured quantitatively with special instruments. Due to the imperfect manufacturing of bearings, all bearings will have a certain measurement value. Usually people hope that the smaller the vibration acceleration value of the bearing, the better, especially for the equipment requiring low noise and long life. According to the bearing diameter, different vibration acceleration levels will be specified. It can be represented by Z1, Z2, Z3, Z4, etc. The vibration acceleration level of Z1 is higher than that of Z2, and so on. For example: ordinary bearing is required to reach Z1 level, and Z4 level will be called "silent bearing". If the vibration acceleration level exceeds the standard requirements, there is a problem with the bearing. The internal causes are: the roundness, waviness and roughness of the steel ball or raceway are unqualified, the cleanliness is poor, the lubrication is poor, and so on. The external causes are: improper installation, pollution, poor supplementary lubrication, load bias or overload, frame resonance, and so on.
8. This is a problem of impulse. Let the momentum before and after a person touches an object change to M & # 8710; 5. In the process of collision, when the force of the object on the human is n and the collision time is t, there is M & # 8710; V=(N-Mg)t!
this n is equal to the human pressure on the object in the collision process. Because t is very small, this n is generally very large, far greater than gravity. The problem can be simplified as:
M & # 8710; V / T = n, this # 8710; V / T is the average acceleration of people in the collision process
I don't know if I'm wrong!
this n is equal to the human pressure on the object in the collision process. Because t is very small, this n is generally very large, far greater than gravity. The problem can be simplified as:
M & # 8710; V / T = n, this # 8710; V / T is the average acceleration of people in the collision process
I don't know if I'm wrong!
9. Generally speaking, we need to know the air density and velocity
F = Q * s
q = 1 / 2* σ* V^2*a;
A = (H / H0) ^ (1 / N)
where q is velocity pressure< br /> σ Air density and velocity
A is the height correction factor
H is the height of the pressure point from the ground
H0 is the reference height, which is 10m
F = Q * s
q = 1 / 2* σ* V^2*a;
A = (H / H0) ^ (1 / N)
where q is velocity pressure< br /> σ Air density and velocity
A is the height correction factor
H is the height of the pressure point from the ground
H0 is the reference height, which is 10m
10. 1. Start with simple mental arithmetic: 3 + 7 = 10.27 + 77 = 100, 100-50 = 50.... "
2. Learn some simple operations: 99x89 + 1x89 = (99 + 1) x89 = 8900
3. Start slowly and accurately, check errors and accumulate experience. And then continuously increase the amount to speed up
you will make progress!!!!!!!!!!!! one
2. Learn some simple operations: 99x89 + 1x89 = (99 + 1) x89 = 8900
3. Start slowly and accurately, check errors and accumulate experience. And then continuously increase the amount to speed up
you will make progress!!!!!!!!!!!! one
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