50 points X How to Prepare for a High School Physics Competition?

First of all, the competition is very dark, and the power and money trading is very serious, unless the ability is very strong, be cautious, and the college entrance examination is the right way. Even if you get the provincial one, it is just a guarantee qualification, and the rest is not good, but it is only a score for the college entrance examination. Let's aspire to be on the national team. Only when you take the country one can you directly protect it.

In terms of learning, you should be diligent and do more questions. It's a cliché, but it's important. Talent is often very secondary here, because people who don't have a little talent won't try, and people who have a lot of talent won't try, everyone is about the same, it depends on who works harder.

The aspect of the examination of force and electromagnetism is the focus, which is the basis and method. Others like light, relativity, atoms, and heat also have to be looked at. To have a knowledge reserve of integration and vectors in mathematics, in addition to optics and quantum theory, which involves the Schrödinger equation, there is also the nature of magnetism in electromagnetism, which do not need to be seen, and the rest must be mastered.

Good luck to the landlord!

Do more questions and do more research, in addition, the mentality is very important, and you must not be in a hurry to do the questions. Don't mess around, and believe in yourself and don't hesitate.

The key to excelling in the exam is to rely on your usual efforts. ,, a blockbuster is rare. In addition, you must control your mentality and do physics problems without rushing.

Can't mess around. But you can't die slowly. An average multiple-choice question takes 2 minutes.

However, it is necessary to grasp the accuracy rate. What you think is right. You choose.

Some of them are uncertain. Put it down. Don't waste time ,.. stopping there

Come back and do it again. When the test starts for 1 hour, go back to the original uncertain question. At this time.

It feels like a different ,..You can definitely answer the questions correctly. That's what physics problems feel like.

Do more questions and do more research There is still hope for you to grasp it now.

...This question. I've been reading the topic for a long time.。。。

It's all about the phase difference... Seemingly... Beyond the scope of the college entrance examination...

All right.. Begin.

If the perpendicular line of a intersects b with c, then bc is the optical path difference, and then from the triangle, it can be obtained: bc=d*sin, because the value mentioned in the title is very small, it can be approximated as: bc=d*

The initial phase of b is given a small amount behind that of a. The length of the BC phase difference, and the phase of point A and point C are the same, that is, the minimum phase difference is guaranteed to be *(2).

That is, the difference after the change: BC-BC'

All right.

If the rope wants to pull B, it will naturally slow down A by a beat, drag A, and do negative work on A. I thought C was AB doing negative work on B.

First of all, AB is regarded as a whole regardless of the internal force, then this is a single pendulum, OA obviously does not do work, A and B exclude, if it is a multiple-choice question, you can actually choose ...... hereBut if you want to know the principle, it's probably because of OA< ob, so the angular velocity of a is larger than b according to the single pendulum period, so choose it this way.

OA is perpendicular to the direction of velocity and definitely does not do work.

The pendulum radius of a is short and the frequency is fast.

b has a long radius and a slow frequency.

Therefore B will drag down A

The angle between the direction of AB and the direction of velocity of A is greater than 90°

The angle between the direction of ab and the direction of velocity of b is less than 90°

Therefore, C d is chosen

The angular velocity of a and b should be the same, and it feels like no work is done, because it is a centrifugal force, and the direction of the force is always perpendicular to the direction of motion.

I think the answer is A, and I don't know the reason, so I think about it.