Why can't it live in peace on this piece of land or that piece of land? Could it be that the female bird living on land here is having an affair and the other side is its wife
Nangong Nuannuan glanced at Nangong Jin, saw that he had finished reading it calmly, turned over the paper and returned it to the principal without any facial expression after all the other parts were correct.
The teacher surnamed Zheng said: "Parents of Nan Xu, you have also read Nan Xu's test paper, I would like to hear your opinion."
Nangong Jin looked at Teacher Zheng with a strange expression on his face.
Teacher Zheng is a middle-aged woman in her 40s, but she blushed because of Nangong Jin.
"Why, you have nothing to say, right? Do you also think that Nan Xu is wrong? If you really think so, I hope you can go back and discipline Nan Xu properly. At least let him understand what it means to respect teachers and value education."
Nangong Xu said lightly: "Teacher, from the dispute between you and Nan Xu's class teacher just now, I can tell that this question was written by you, so you are very dissatisfied with Nan Xu's negation of you. Nan Xu also Small, there is no way to make an analysis from a scientific theory, only to analyze the feasibility of crows drinking water and birds flying over the ocean from the normal state. But I can tell you a formula about buoyancy very clearly.
If you want a piece of wood to carry a bird, then one condition needs to be met, that is - the buoyancy generated by the wood - the gravity of the wood itself + the gravity of the bird.
In order to maximize the effect of the wood, we assume that the wood is just completely stepped below the water surface, then the conclusion that can be drawn is - density of water * volume of wood * acceleration of gravity - density of wood * volume of wood * acceleration of gravity + bird The weight*gravitational acceleration. Combining similar items and simplifying them gives: volume of wood * (density of water - density of wood - weight of bird).
The density of water is about 1,000 kilograms per cubic meter, while the density of wood is between 400 and 750 kilograms per cubic meter. Let's assume that this bird is very smart and found a lighter one. The density of wood is based on 500 kilograms per cubic meter. Calculated in cubic meters. It can be obtained: weight of bird/volume of wood - 500 kg/m3.
In simple terms, this is the conclusion: if the bird weighs a kilogram, then the volume of the wood - 1/500 cubic meter - 0.002 cubic meter - 2 cubic decimeters.
Teacher, do you know the concept of 2 cubic decimeters? It is our common brick, about two pieces. What is the concept of a bird weighing one kilogram? A chicken weighs about three or four catties, and a one kilogram is a small chick.
Can a bird the size of a chicken move two pieces of wood the size of a brick or a stick with the thickness of an arm? Even if it could, the resistance of the wind to the block would make it roll directly from the ocean to the bottom of the sea.
You might say that the bird in your proposition is large, much larger than a chick-sized bird. But the bird is big and heavy, and what it wants to grab at that time may not be a branch as thick as an arm, but a pillar as Nan Xu said, and it will have to travel with it. I don't think a bird can move a pole. Teacher, what do you say? "
headmaster:…
head teacher:…
Question teacher: ...! ! !
Nangong Nuannuan on the side is serious. But inside, she felt that she could laugh into internal injuries.
Her brother is probably a straight man with terminal cancer, right
Identification is completed!
Nangong Jin seemed to think that what he said was not enough to piss off the teacher, and said—