It's a pity that the people in front of them are still too hierarchical. The family leader Yan Shenggong himself does not allow it, and they dare not speak more.
Kong Lingyi thought for a long time and finally sighed: "Everyone, please disperse." He picked up the introductory textbooks and sat at his desk after returning. After flipping through them, he found them quite interesting.
After all, it is for beginners. Li Yu specially added some stories, such as Archimedes discovering the law of buoyancy while taking a bath, Franklin flying a kite, and Newton's apple hitting him. Some experiments are also combined with life, and they are all for future generations. It's familiar, and it's really attractive during this period.
Most of the Confucian classics books at this time were obscure and difficult to understand, and they did not make many simplifications specifically for school children. The writing skills of later generations like Li Yu were very advantageous and their communication ability was also strong.
It's just that when Kong Lingyi read the mathematical derivation, he was a little confused. The key is that he had no contact with science and had never even seen the definitions of triangles, quadrilaterals, or parallel lines.
He picked up paper and pen and wanted to really study, but was interrupted by Yan Jingyu who came in: "Yan Shenggong, are you really reading Li Yu's book?" Kong Lingyi said: "I just want to know what Western learning is like and what kind of The magic power can make the court abolish the imperial examination." Yan Jingyu said: "No matter how thorough the research is, it is useless. How about writing a memorial to the court? I will write a letter and send it to Zhejiang Nanzong and the Confucius Temple in Beijing, and jointly submit it to them. Just contact them. There are quite a few people who have been promoted to Jinshi." Kong Lingyi looked at the geometric figures he drew with a brush and felt that it was really too difficult to learn, so he closed the book and said, "Yes, let's try again! You are Hanlin Doctors of the Five Classics from the Academy also wrote letters to the Imperial Academy to win their support." Yan Jingyu said: "There is no problem, as long as the imperial examination does not fail, Confucianism will not fail." - In today's situation, Li Yu was not at a disadvantage, and even more There was no red-faced and thick-necked argument, so the warrants from Shandong Governor Yang Shixiang and the county magistrate were not used at all.
Lu Bicheng praised: "You really have the style of Zhuge Kongming's quarrel with the Confucian scholars." Li Yu said with a smile: "It's much better than Mr. Kongming's situation back then. After all, Western learning is the general trend. Facts are better than eloquence. I just need to be clear and organized. It's enough to tell him." Yan Fu said: "As long as Yan Shenggong doesn't make any more attacks, there should be no more scholars attacking you for a while." He should have known what happened to Li Yu in the guild hall outside Xuanwu Gate.
Li Yu also understood the principle of hitting with one punch to avoid hundreds of punches, so as to have a quiet environment.
Otherwise, it would be really annoying if a scholar comes to the door at every turn. Now if Yan Shenggong is asked to turn off the fire, the others will naturally turn off the fire.
Lu Bicheng asked: "Are we going back to the capital?" Li Yu said: "We are all here. Mount Tai is not far away. Wouldn't it be beautiful to go and experience the mountains together?" Yan Fu agreed: "What a good idea! I haven't either It’s a rare opportunity to climb Dongyue Mountain and arrive in Shandong today.” Mount Tai is a famous Taoist mountain. The current tourist situation cannot be compared with the situation after the massive investment of later generations: there are no mountain pickers and no eighteen plates, so the difficulty of climbing is higher. bigger.
But a few people were in a very good mood and had endless physical strength. Li Yu often played football to exercise, and Lu Bicheng was also in very good physical condition. The two of them supported Yan Fu from time to time, and it took them a long time to finally climb up.
The altitude of Mount Tai is actually not high. The reason why it appears high is because there are many plains in Shandong. A mountain that is pulled up from the plains will appear very tall.
Climbing high and looking far away was a very enjoyable thing in the eyes of the ancients. Because they did not have the opportunity to fly, Yan Fu and Lu Bicheng looked around as much as possible.
Yan Fu couldn't help but sigh: "No wonder they are often said to be great rivers and mountains. Such beautiful scenery really makes people forget to leave." Li Yu also felt a little bit, but it was a pity that Shandong would be classified as the Japanese sphere of influence after World War I, which was the lowest point in the history of the Chinese nation. There are still many ups and downs to overcome during this period.
After their tour, they returned to the capital along the same route. After returning to the capital, Fengling told Li Yu that people from Qiluofu Foreign Trade Co., Ltd. in Dongjiaomin Lane had come to see him.
Li Yu knew that the photographic equipment he ordered from Germany had arrived. The price was very unattractive and ridiculously high, costing over five hundred taels of silver.
But considering the purchasing power, in future generations it will still be affordable for a SLR. It seems that sentence
"Photography will ruin three generations, SLR will ruin a life" is also very appropriate to use in the early 20th century. Moreover, the lens of the camera in front of me is from the famous German Zeiss, so it is worth the money.
Li Yu immediately told Lu Bicheng that he wanted to take a photo of her. Women are women, and they get excited when they hear about taking pictures. Lu Bicheng dressed up carefully before coming to see him.
Li Yu was still a little shocked. The person in front of him was much more beautiful than in the historical photos. Although she was not as beautiful as Lin Huiyin, in this era, she was definitely among the top beauties.
Li Yu bought a lot of film and took a lot of pictures. Then he smiled and said, "It's almost done. You can change your clothes another day and continue." When the two of them started filming, Fengling came over and said, "Sir, there is a telegram." Li Yu took it over and saw that it was sent from Germany. The senders are Siemens and the Prussian Academy of Sciences.
"Dear Mr. Li Yu, on behalf of our company and the Academy of Sciences, I, Carl Siemens, would like to invite you to go to Germany in person. I will set up a research institute, and the chief scientists will be you and Academician Planck to help the two in For further research on blackbody radiation." Good guy, he actually asked him to work with Planck.
It's a real honor. Lu Bicheng knew English, but did not understand German yet, and asked, "What is the content?" Li Yu said, "There is a telegram from Germany asking me to leave."
"About science?" Lu Bicheng asked again. Li Yu nodded: "Yes." He suddenly remembered that going by himself was indeed boring, and asked: "Do you want to go together? I also bought a small island in Sweden, which is very beautiful." Lu Bicheng's eyes were filled with tears
"I want to go" was the word, but he still said a little reservedly: "Is this...appropriate?" Li Yu smiled and said: "What's inappropriate? Don't you want to see Europe? It's the most powerful country in the world right now." When the time comes, I can write a travel note and publish it in Ta Kung Pao, which might even cause a sensation." Nowadays, there are really very few women who travel to the West and write travel notes.
Lu Bicheng was a little shaken and thought: "As a job, it is feasible."
"Of course it's feasible," Li Yu said,
"Going to the romantic Seine River in France may inspire you to write some more excellent poems." Lu Bicheng asked: "Where is that place on the Seine River?" Li Yu said: "It is a place where writers and artists gather together. ." Lu Bicheng became more interested now: "I want to... think about it again." Li Yu did not press for it: "Waiting for your news." When Li Yu returned to the house, he sent a telegram to Germany: "Thank you Mr. Siemens for the invitation. I will leave in the near future." Li Yu's game theory has now had a great influence in European academic circles. Not only Germany, but also invitations from academies of sciences in several countries are pouring in, including the Swedish Academy of Sciences, the Danish Academy of Sciences, the French Academy of Sciences, the Academy of Saint Peter, etc. I want to invite him.
In addition, some European observatories such as Greenwich also want to invite him to conduct research and lectures on the structure of the spiral arms of the Milky Way and extragalactic galaxies.
It seems that we really need to leave for Europe. The key is to take advantage of the fact that the Russo-Japanese War has not started yet and the Trans-Siberian Railway is still available, which can save a lot of time on the round trip.
News also came from the United States, first of all, a telegram from Zou Zhou. He regularly reported to Li Yu on the factory situation, and the current production was very good. In addition, he also said that fifteen radio devices had been sent over, and they were specially designed. Mr. Silla had made some improvements and said he must take a good look at it.
In addition, on the "sce" side, these few issues have been really explosive, and Li Yu has become a super trump card.
Although the Association for the Advancement of Science's telegram didn't say it clearly, it still hoped that Li Yu would write another manuscript.
Anyway, it is his own thing, so Li Yu will do his duty. Now "sce" has actually received a lot of manuscripts, and the quality has been improved, so Li Yu does not need to publish major discoveries too intensively, otherwise the tone will be set higher and higher at the beginning, and in the future, if there is a high opening and a low closing The situation is not easy to handle either.
So this time he planned to write a more relaxed scientific article. Li Yu likes to be in touch with reality and will not write too dry content. This time his starting point is the famous problem that has not yet been solved.
"The dropped cat problem". The question is simple, why is it that if you hold a cat by its four legs, hang it upside down, and then let go, the cat will always land on all fours?
This question may sound far-fetched and inexplicable, because it is a very natural phenomenon, but it has troubled the physics community for hundreds of years.
Because this question involves a very important conserved quantity in physics: conservation of angular momentum. When solving high school physics problems, we often list several conservation equations, such as conservation of momentum, conservation of mass, conservation of angular momentum, etc.
The so-called conservation of angular momentum is also very simple to understand. It means that the angular momentum of an object remains unchanged when there is no external torque.
That is to say, there is a stationary ring that will only rotate when you move it with your hand. If you stand on an ideal smooth plane with no friction and your head turns to the left, your body will definitely turn in the opposite direction in order to offset this part of the angular momentum.
So the falling cat problem becomes a difficult problem: when you let go, the cat's angular momentum is 0, and there is no external torque, but it can land firmly on all fours, that is, it completes a 180° turn in the air.
At first glance, it violates the conservation of angular momentum. Later, some physicists believed that the opposite rotation of other parts of the body must have offset this part of the angular momentum. Most people thought it was the tail.
But it is obviously unreliable, because the mass of a cat's tail is too small compared to its body, unless it can spin like a helicopter propeller.
But obviously the cat's tail did not turn into a propeller when it fell. The key point is that even if a tailless cat is used as an experiment, it can still land on all fours.
Cats move too fast for the human eye to see clearly, so physicists have been unable to solve this problem for a long time. The solution will have to wait until the emergence of high-speed cameras.
It was around 1969 that Stanford University solved this problem at a theoretical level.
In fact, the cat's body first bends in the air, then retracts the front legs, kicks the hind legs, and reduces the amount of rotation of the front part of the body to straighten; after the front part of the body turns straight, then extends the front legs, retracts the rear legs, Allow the back of the body to straighten.
In short, it is to constantly adjust the rotation amount of different parts of the body to make the overall rotation amount zero.
The whole action happened in the blink of an eye. It must be said that the evolution of nature is really ingenious. This kind of article is more in line with Li Yu's style. It introduces physics into life, and it can also make it more interesting when placed in a magazine.
