Short eyes and jumping driving force show short buds on sunny days.
He won the first place in the exam, which we all said was a coincidence. He treats people warmly.
I don't understand: "How can his' cow' be so accurate?" Curiosity shǐ I went to his house, which may solve the mystery. When I arrived at his house, he warmly invited me in. I saw books on the bed, on the desk and in the cupboard, including inside and outside the classroom, childhood, a hundred thousand whys and so on.
"Bragging" Wang's real name is Jin Chen, but this real name is almost forgotten by everyone. Because he likes to brag, and he plays well. Not to mention our classmates, sometimes even the teacher listens to him play wonderfully! This famous "braggart" is only thirteen years old, short and short, with a dark and thin face. But those eyes are big and full of spirit.
On the first day he moved from the countryside to the city, he boasted in class. He said that you know your height and weight by knowing how long your feet are. I thought of his ugliness, so I measured my feet with a ruler and reported the figures. After a while he told me my height and weight. The students all said that he was "bragging". I went home at night and measured my height and weight, and the error with him was very small. But I'm still bá n xì n bá n yì. Is this a coincidence? After another evening self-study, everyone watched the stars according to the homework assigned by the science teacher. King "Bragging" began to brag again. He said, "I know that the moon is white and Mars is orange." After listening to his words, I thought, "I didn't see you ugly last time. This time you brag, so I have to satirize you." But then I thought, "No, what if what he said is right again? I have to ask the teacher first! " I didn't know what he said was true until I asked the teacher. His eyes are amazing! A new building was built next to the school, and the "bragging" king took the opportunity to "brag": "Who knows the distance from the school gate to the building?" Students, look at me, I look at you, and there are many discussions. Some say they don't know, some say they use a tape measure, and some say they use advanced surveying and mapping instruments to measure. He proudly said, "I just need to have a visual inspection!" " At this point, everyone focused on the bragging king, only to see his arm stretched out, his thumb straightened, his eyes narrowed, he thought for a moment and said loudly, "10: 35 meters!" Ah! It's all j and jīng què to two decimal places. Then I quietly measured it with a tape measure, only one meter was missing. Oh, what a mystery!
I can't figure out how his cows can blow so accurately. I went to his house, which may solve the mystery. When I arrived at his house, he warmly invited me in. I see books on the bed, on the table and in the cupboard. There are100000 children inside and outside the classroom. Why not wait? That's not a book, it's his cow. Without these "cows", can he blow? I punched him hard on the back and said, "You guys, I finally got this cow." Say that finish, we laughed together.
The second paragraph is auspicious words.
6 the first time: measure your feet to know your height.
Know the colors of the moon and Mars for the second time.
Take the third distance measurement with glasses.
It shows that he is not bragging, but has read a lot of books and learned a lot.
hot-air artist
Interviewee: Juan bo 0420- assistant level 2 4-3 12: 12.
1 with a grain of salt, precision drive
Small eyes challenge the ring drive to reveal the length of sunny days.
It's a coincidence that Xiaohong and I bought the same hair accessories.
I warmly embraced my long-lost classmates.
4. "How can his" cow "be so accurate?" Curiosity shǐ I went to his house, which may solve the mystery. When I arrived at his house, he warmly invited me in. I saw books on the bed, on the desk and in the cupboard, including inside and outside the classroom, childhood, a hundred thousand whys and so on.
5 A, bragging is bragging. "Wang's real name is Jin Chen, but this real name is almost forgotten by everyone. Because he likes to brag, and he plays well. Not to mention our classmates, sometimes even the teacher listens to him play wonderfully! This famous "braggart" is only thirteen years old, short and short, with a dark and thin face. But those eyes are big and full of spirit.
B, brag three times. On the first day he moved from the countryside to the city, he bragged in class. He said he knew how long your feet were, and he knew your height and weight. I thought of his ugliness, so I measured my feet with a ruler and reported the figures. After a while he told me my height and weight. The students all said that he was "bragging". I went home at night and measured my height and weight, and the error with him was very small. But I'm still bá n xì n bá n yì. Is this a coincidence? After another evening self-study, everyone watched the stars according to the homework assigned by the science teacher. King "Bragging" began to brag again. He said, "I know that the moon is white and Mars is orange." After listening to his words, I thought, "I didn't see you ugly last time. This time you brag, so I have to satirize you." But then I thought, "No, what if what he said is right again? I have to ask the teacher first! " I didn't know what he said was true until I asked the teacher. His eyes are amazing! A new building was built next to the school, and the "bragging" king took the opportunity to "brag": "Who knows the distance from the school gate to the building?" Students, look at me, I look at you, and there are many discussions. Some say they don't know, some say they use a tape measure, and some say they use advanced surveying and mapping instruments to measure. He proudly said, "I just need to have a visual inspection!" " At this point, everyone focused on the bragging king, only to see his arm stretched out, his thumb straightened, his eyes narrowed, he thought for a moment and said loudly, "10: 35 meters!" Ah! It's all j and jīng què to two decimal places. Then I quietly measured it with a tape measure, only one meter was missing. Oh, what a mystery!
C. solving puzzles I can't figure out how his cow can blow so accurately. I went to his house, which may solve the mystery. When I arrived at his house, he warmly invited me in. I see a hundred thousand books on the bed, on the desk and in the cupboard. Why don't you wait? Not a book, but his cow. Without these cows, can he blow? I punched him hard on the back and said, "You guys, I finally got this cow." Say that finish, we laughed together.
The first time: the braggart tells you how long your feet are, and you know your height and weight.
The second time: the braggart said that he knew that the moon was white and Mars was orange.
The third time: the braggart said that the distance from the school gate to the building can be visually obtained.
He can brag because he has a wide range of knowledge.
8 "bragging" king
I have done this reading problem!
Responder: Ye De-Trainee Magician Level 2 4-5 23:32
I. Books, 100,000 Why?
"Hundreds of why? From the day it was published, it has influenced China people from generation to generation, guiding us to think and explore nature. For example, the mpemba effect in the book: Why does boiling water freeze before cold water? Help us understand the freezing phenomenon of water correctly.
Mpemba effect, known as the world physics problem, has been denied by physics teachers for more than 40 years, and even described as a lie by the media. However, according to the theory of middle school physics, it can be found that Mpamba problem is only a comprehensive problem of middle school students' knowledge, and every middle school student can master the method of proof.
It is proved that if hot water can freeze before cold water, the necessary conditions are either that the freezing point of hot water is higher than that of cold water or that the cooling speed of hot water is faster than that of cold water. Because the freezing point of pure hot water is the same as that of cold water under normal pressure, it must be proved that the cooling speed of hot water is faster than that of cold water to prove the mpemba effect.
According to the basic theory of physics, the evaporation intensity of hot water is greater than that of cold water, and the density is less than that of cold water. If you take two identical unsealed containers, put the same amount of water, one is hot water and the other is cold water, and put them at the same external ambient temperature. In the process of cooling, hot water loses more water due to evaporation than cold water, so the final mass of water with high initial temperature must be less than that with low initial temperature, and the cooling speed of hot water must always be faster than that of cold water.
If you take two identical sealed containers, put the same amount of water, one is hot water and the other is cold water, and put them at the same external ambient temperature. In the process of cooling, the air pressure in the container formed by the increase of the density and the decrease of the volume of hot water is inevitably lower than that of cold water. The boiling point temperature of hot water is lower than that of cold water, and the convection intensity is higher than that of cold water. Hot water always loses more heat per unit time than cold water, so the cooling speed of hot water is always faster than cold water.
Because the cooling speed of hot water is always faster than that of cold water under the same mass and the same external environment temperature, when the external environment temperature is continuously cooled, the temperature of hot water will be lower than that of cold water; When the external environment temperature is in a cooling state within a specific time or temperature range, the temperature of hot water will be equal to or higher than that of cold water. Therefore, it is a common phenomenon that the temperature of hot water will be lower than that of cold water under the same mass and external environment temperature. It is a specific phenomenon that cold water freezes before hot water at a specific external environment temperature. Mpemba effect accords with the basic theory of physics.
Attachment: first complete the operation points of the frozen boiling water experiment.
For more than forty years, few people in the world have completed the experiment of boiling water freezing first because the experimental method is unscientific. Theoretically speaking, water at 36℃ can freeze before water at 35℃ under the condition of homogeneous quantity and the same external environment temperature. However, if the temperature of the two is close, the evaporation intensity and density are not much different, so it is difficult to show the advantages of hot water in cooling rate by experimental methods. According to the basic theory of physics, 100℃ is the boiling point of water at normal pressure, and the density of water is the highest at 4℃. In order to complete the experiment of hot water freezing first more clearly, we can give the known conditions according to Mpamba problem, choose hot water and cold water as close as possible to 100℃, and reasonable the initial temperature of the external environment experiment to slow down the decline of the external environment temperature. The unsealed container has a large evaporation area, and the sealed container has high sealing performance. Special attention should be paid to the extraction method of boiling water: once boiling water leaves the heating source, the temperature and evaporation intensity drop rapidly, so it is necessary to extract a certain amount of boiling water quickly and accurately, and then extract cold water according to the requirements of uniformity and quantity.
Operation method of completing boiling water icing experiment with unsealed container first: (for reference)
1, control the initial temperature of the experiment in the freezer at 4 degrees Celsius, take two identical plates, put the same amount of water, one is cold water at 4 degrees Celsius and the other is hot water near 100 degrees Celsius, and put them in the freezer at the same time. Control the temperature drop rate of the freezing room to make it drop by 65438 0 degrees Celsius every hour (or drop by 65438 0 degrees Celsius every two hours), and record the final quality of hot water and cold water after freezing.
2. In winter, the experiment is completed by natural cooling. When the outdoor temperature is not lower than 4 degrees Celsius at noon and the lowest temperature at night is -2~3 degrees Celsius, you can choose to take two identical plates at noon and put in the same amount of water, one is hot water close to 100 degrees Celsius and the other is cold water with the same outdoor temperature. Put them in the same outdoor location at the same time, and record the time when hot water and cold water are completely frozen and their final quality.
3. According to the experimental method of three senior high school students in Shanghai, the final quality of hot water and cold water after freezing was recorded. According to the fact that the final mass of hot water is less than that of cold water, it is proved that hot water can freeze before cold water because its cooling speed is always faster than cold water.
Please refer toNo. 1 and No.2 experimental methods for unsealed containers when doing experiments with sealed containers.
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