Wild Romance

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It's time for lunch, and everyone is scrambling to get out of the classroom and go to the dining hall to get food.

After the other students had finished leaving, Zhang Liying called Wei Xiaofan, Wei Xiaoping and Zhang Xiaoyan to sit down at the desks.

'Everyone came up with their own answers, right?Take it out and refer to each other! ' Zhang Liying said.

So Zhang Liying first put her answer slips on the table, followed by Wei Xiaoping, Wei Xiaofan, and Zhang Xiaoyan.

'My answer is that the chosen answer is one, and the balance says that the pole stays on the horizontal line.Wei Xiaofan, what answer do you choose first? '

'I choose three, and the weighing pole is tilted to the right. ' Wei Xiaofan said.

'I choose [-], the scale says that the lever is tilted to the left. 'Wei Xiaoping said.

'I, like Wei Xiaoping, chose the second option, and the balance said that the pole tilted to the left. ' Zhang Xiaoyan said after reading the note on the table.

Zhang Liying said: "The reason I choose one is that when the bees flap their wings, they give the air a downward force, and then the air passes through the glass wall of the container to give an upward reaction force, so that the gravity of the bee is equal to the reaction force of the air." Balanced, so the bees can stay in the air, and the momentum of the air on the glass wall is also equal to the gravity of the bees, so the balance says that the pole is in a balanced state! . '

As soon as Zhang Liying finished speaking, Wei Xiaofan said: "Well, my reason is almost the same as that of class leader Zhang Liying!"But I think the airflow power generated by the bees pushing the air flow when they flap their wings, and the power generated by rushing to the glass container, is greater than the weight of the bees, so the bees can stop in the air, so the weighing rod will tilt to the right ! '

Zhang Xiaoyan said; "After listening to your reasons, I feel very reasonable. I think Wei Xiaoping and I chose the second reason because we chose the wrong one!"I originally thought that when the bee flies in the air in the container, because it is not in contact with the container, it will not produce weight and gravity, so I think that after the container on the right is missing the gravity of a bee and presses on the container, the pole will tilt to the left !Now, after listening to Zhang Liying, you and Wei Xiaofan's explanations, I realize that I ignore the key point that air flow will also produce impact! '

Wei Xiaoping smiled and said: "Student Zhang Liying, you have said everything I want to say, what do you want me to say?" ! ——My thoughts and reasons are the same as those of Zhang Xiaoyan! '

After Zhang Xiaoyan and Wei Xiaoping finished speaking, Zhang Liying nodded, then looked at Wei Xiaofan suspiciously, and asked: "Student Wei Xiaofan, your reason is a bit different from mine, can you explain it in more detail?"I think it should be that the bees flap their wings to make the air flow and hit the glass wall of the container. The gravity is equal to the weight of the bees, so that the bees can stop in the air! '

Wei Xiaofan said: "I thought about it just now, and it is very likely that the monitor's answer is correct, because according to Newton's third law of motion, the reaction force of the air on the bee's wings is balanced with the gravity of the bee itself, so that the bee can stay in the air; at the same time, The air flowing in the container produces a uniform impact force on the glass wall of the container, which is also equal to the gravity of the bees, so the pole is stopped on the horizontal line! '

Wei Xiaoping said: "After listening to Wei Xiaofan's explanation, it reminded me of seeing a helicopter hovering above the grass on TV.When the helicopter on TV stays over the grass, the grass on the grass is said to push the air downward when the helicopter propeller rotates, making the air flow into a huge wind wave and blowing to the grass, blowing the grass on the ground to swing downward continuously . '

'Yes, I mean exactly that!I think, the bee stays above the small container. I think it is also like a helicopter, it can stay in the air. Its wings fan the air, so that the reaction force of the air supports it, and then continuously replenishes the new air that comes in, and pushes it forward again. The original air flows to the ground, and then turns into a small wind wave and blows to the glass wall. The wind force on the glass wall is also equivalent to the gravity of a bee, so the weight of the two containers is also equal at this time, so the pole is in a horizontal state!This is just my guess!Not necessarily correct! ' Wei Xiaofan said.

Zhang Liying stared at Wei Xiaofan, felt that Wei Xiaofan's analysis seemed to be more detailed than hers, although Wei Xiaofan's reasons may not be correct, but the analysis was reasonable!

Zhang Liying recalled that Chinese teacher Wu Wenbin told Wei Xiaofan's five articles!He looked at Wei Xiaofan again.

What Wei Xiaofan is wearing today is a white shirt that has been washed whitishly, the inside of the collar is a bit torn due to too much washing, and the white collar that is a bit torn by the neck Kind of rolled up.His hair is a bit long and messy, maybe he hasn't cut it for two or three months; although his clothes are old and his hair is long and messy, he has a handsome face and a smart mind!As long as one looks at his handsome face and his clever mind, people will unknowingly forget his shabby clothes and messy long hair!

Zhang Liying's eyes moved from Wei Xiaofan's face to Wei Xiaoping's next to him, and saw that the latter's face was almost exactly the same as Wei Xiaofan's, even the skin color was almost the same, the only difference was that Wei Xiaofan's clothes were old clothes, and his hair was Long hair; Wei Xiaoping's clothes are also white shirts, but they are relatively new, and his hair is shorter than Wei Xiaofan's.If it wasn't for the difference in clothes and hair, when two people walked together, others would not be able to tell who was Wei Xiaofan and who was Wei Xiaoping!

Zhang Xiaoyan saw that Zhang Liying looked at Wei Xiaofan and Wei Xiaoping for a long time, and seemed to be in a daze, so she shook her hand at Zhang Liying and said:

'Alas!Our squad leader, what are you looking at?The look of dementia! '

Seeing Zhang Xiaoyan dazzled herself with her hands, Zhang Liying woke up from looking at Wei Xiaofan and Wei Xiaoping, and said with a smile:

'Zhang Xiaoyan, if Wei Xiaofan and Wei Xiaoping have the same hairstyle and clothes, can you tell who they are? '

Hearing Zhang Liying's question, Zhang Xiaoyan also looked at it carefully, came over for a while, and said, "Don't tell me, if that's the case, I really can't tell the difference!"I didn't pay much attention before, alas, classmate Wei Xiaofan, classmate Wei Xiaoping, were you two reincarnated as twin brothers in your previous life?What is so similar? '

Wei Xiaoping said hehe: "I think it should be!"Wei Xiaofan and I are not only similar in appearance, but also in height, the most important thing is in age, we were born in the same year and the same month, only one day difference! '

'real? Zhang Liying's eyes widened and she exclaimed, "Isn't this too coincidental?"The difference is that the place of birth and the date of birth are different? '

'Exactly! 'Wei Xiaoping said.

Zhang Xiaoyan also said in surprise: "Is there really such a coincidence in this world?" !And the IQ is almost the same! '

'Yes!What a coincidence!It would be even better if you both have the same family circumstances!so.Wei Xiaofan no longer has to worry about finishing the book! ' Zhang Liying said a little lonely.

Hearing that Zhang Liying was a little sad about studying for her, Wei Xiaofan was slightly moved inexplicably, and said:

"Squad leader Zhang, don't worry, no matter what kind of difficulties I encounter, I will find a way to finish my studies. Moreover, for my study, my classmate Wei Xiaoping and I are thinking about how to implement our plan!" '

'plan?Is it about reading? ' Zhang Liying asked after hearing this.

Wei Xiaofan and Wei Xiaoping told Zhang Liying and Zhang Xiaoyan about their plan to do business during the summer vacation!

Zhang Liying listened, and said with a smile: "This plan is good, but can you do it with the face?"Do you know how much courage it takes to set up a street stall? '

Zhang Liying said, similar to when Wei Xiaofan and Wei Xiaoping set up a street stall for the first time, they might meet an acquaintance and show awkwardness or embarrassment, and laughed!