What physicist has lost in running around? 30

You ask this question should be the allusion in Chapter 9, Section 7 of Physics in Grade 8, and it's called The Story of Coraton "Lost the Opportunity" He did an experiment with electromagnetic induction in two rooms, and the story that your teacher told is definitely the story of Coraton "Lost the Opportunity", because I'm a middle school teacher myself, and I just finished this lesson.

It was Faraday's first discovery of the electromagnetic effect.

Colaton, assistant to the young Swiss physicist Delarive.

a. The scientific method used by the particle is the method of establishing an idealized physical model, so A is wrong;

b. In order to study the velocity at a certain moment or a certain position, we use the average velocity of taking a very small time, that is, letting time tend to an infinite hour, as the instantaneous velocity, that is, the limit thinking method is adopted, so B is correct;

c. When Galileo studied the acceleration of the copper ball motion in the inclined plane experiment, he first let the inclination angle of the inclined plane change the mass and height of the copper ball to obtain that the acceleration of the ball is the same, and then maintain the mass and height to increase the inclination angle of the inclined plane, repeat the above experiment, and know that the acceleration of the small ball increases with the increase of the inclination angle of the inclined plane, so the control variable method should be used, so C is correct;

d. In the displacement formula of uniform variable speed motion, the micro element method is used to turn the variable speed motion into a period of uniform motion after infinite differentiation, that is, the micro element method is adopted; Therefore d is correct;

Therefore: BCD

Military, what is military, on the surface, the military, a lot of science and technology are produced by the military, so to speak, the military has affected private wealth, human culture, physics has affected the military, without physics you are not qualified to ask questions here, chemistry is also physics at a deeper level, think about the transition of electrons, energy has to be converted, at a higher level we live in the material world, in 5 billion years [the sun] will swallow the earth, then physics will appear, I think, You must be the first to finish, the natural law of survival of the fittest adapts to the material world, and there are so many resources, so for my higher-level development, you have to be eliminated, if there is no physics, there will be no China today, and without you is the most likely.

According to Marx's understanding of the law governing the development of human society, all science and technology serve the development of the productive forces of human society. Only science and technology that can produce powerful productive forces can be called science and technology, not because of how advanced it is.

The current physics is pinned on the generation of new instruments. It may be necessary to rely on breakthroughs in other disciplines.

Wouldn't it be happier to think about what to do so much, and to study whatever direction you are interested in?

Mainly optical and mechanical, such as small hole imaging, plane mirror imaging, lens imaging, etc., although the theory is not very perfect, but it can be regarded as a pioneer. In addition to the achievements in optics, there are also mechanical, acoustic aspects.

Mozi's View of Science, although it is difficult to see the whole of it and lacks a clear and systematic theory, it has a wide range of fields and many creations: for example, (1) the astonishing pioneer theory of today's "atomic theory"; (2) the discovery of "quantity" in Chinese thought; (3) In astronomy, the regressive motion of the sun and moon on the position of stars; (4) the discovery of "zero" in mathematics and the concept of "place value"; (5) In terms of physical theory, the cosmological creation theory of waves and particles; (6) In terms of weights and measures, he is the ancestor of Atwood machinery and the prophet of four-wheeled vehicles and ladder construction; (7) In terms of dynamics, the knowledge of the development of "ballistics" and "kites"; (8) Advanced insights and photographic principles of the optical kaleidoscope; (9) Acoustically, the invention of the microphone; (10) In mechanical engineering, there are more than a dozen inventions and discoveries such as the manufacture of piston bellows and crossbow machines. - Reference.

Hello! Imaging of small holes and atoms.

It only represents a personal opinion, don't spray if you don't like it, thank you.

(1) Small with heavy force g small.

100N, large counterweight weight g large.

520N, the net force is 420N, and the distance h=1m that the counterweight moves each time it is lifted is 1m, that is, the distance that one end of the rope moves is 1m

The work done on the leaves to the water is:

w=g?h=420n×1m=420j；

2) It is known from ** that the water temperature rises once it rises, and the heat absorbed by the water is

q=cm△t=

j/（kg?℃）

q=w, energy is conserved

3) The internal energy converted by mechanical energy, including the internal energy of water and the internal energy generated by frictional heat overcoming friction and doing work to consume part of the energy; The results of the experiment are based on a large number of experiments

It is enough to talk about reasonable feelings, for example: truth is often the result of continuous exploration and trial and error; We must be meticulous in our approach to science, etc

Answer: (1) The work done on the counterweight lifting of the rotating impeller is 420J;

2) See the answer section;

3) The error in this experiment is mainly due to the fact that part of the energy is consumed by overcoming friction and doing work; The results of the experiment are based on a large number of experiments