There is a way to do physics problems!! Thanks 20

I'm a freshman, and I got a perfect score in the college entrance examination last year, so I'll introduce you to how I studied in the first place:

1 Basic knowledge is very important, the origin of special theorems, inferences and proofs must be completely understood, 2 Reasonable use of class time, listen carefully, do not think that you understand something and do not listen to the class, this is a big taboo!! After class, you should read the book carefully (sample questions, basic content) and do the exercises after class.

3 Find time to do difficult problems on the basis of 1 2, strengthen your problem-solving thinking and analytical skills!!

4 Reading questions generally need 3 sides, after the first side, you should have a general understanding of the problem and solve the problem, and the second side should outline the key content and numbers in the question.

The third aspect is to check what you have drawn and clear your mind, thinking about what formulas, theorems, or so on might be used.

5 Do the question When doing the question, the necessary text should be written, and the marking teacher can see your idea of doing the question, which is also useful for you!!

Finally, there is no need to do too many questions, but you need to learn something from each question, such as how to solve similar problems in the future and what you should pay attention to.

There are several major sections of high school physics: mechanics, electromagnetism...

Conservation of energy in mechanics, momentum theorem, conservation of mechanical energy. The kinetic energy theorem, the Lorentz force in electromagnetism, the left-handed rule, the right-hand rule.

These are all compulsory contents in the college entrance examination, and sometimes they are also taken comprehensively, which requires you to have a considerable understanding and familiarity with each theorem and rule!!

Generally mechanics questions.

Force analysis is the most important.

If it's electrical. That's the most important thing to redraw the circuit diagram.

Make up for it.

Read more textbooks, do more exercises, and what the teacher says is nonsense, this is my experience.

Just do the contest questions and do more.

Do a good job of basic skills and analyze carefully.

1 All the first question, the real image light screen.

The second problem is that if the magnifying glass is placed outside the double focal length of the lens, it should be placed within the double focal length.

The third problem is that the first one places the object at two times the focal length, so the focal length is 25cm, and the second convex lens has a focal length of 15cm, and only the object placed at the focal point is not imaged, so the focal length ratio is 5:3

True; Alone;

The phase seen with a magnifying glass is an imaginary image, so the words you see will not be an inverted and shrunken phase.

Virtual image light screen.

It should be an upright enlarged image.

It's too easy, physics in the second year of junior high school, just bring the formula into it. The first question is the pressure p= hg=10 The second question is that the pressure is equal to the gravity of the container plus the gravity of water, f=g1+g2=5+10

The density of water is 1000, which is wrong.

Solution: 72km h=20m s

The distance traveled by the car in 4s s1 = v1t = 20m s 4s = 80m sound distance traveled s2 = v2t = 340m s 4s = 1360m Since the car is already 80m away from the horn when the echo is heard, the distance between the car and the mountain is s=(s2+s1) 2=(1360m+80m) 2=720m

A: The distance from the car to Takayama is 720m.

Vehicle speed v=72km h=20m s, t=4s, let the distance be x

Time t the distance the car travels s'=vt=20*4=80m, time t, whistle transmission distance, s=(x+s')+x=2x+80, and s=v*t=340*4=1360m

Therefore 2x+80=1360

x=640m

Let the distance be x, and the equation is as follows: ().

Unit conversion: 72km h=20m s

2x-20*4=340*4

It's good to calculate the result x=720m

b add and divide by 4

That is, the average.

Round again.