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 "It's all a group of people who don't do their jobs properly, but they are so arrogant that they have nothing to say."
 Qin Yi shook his head helplessly and started looking for books.
 The library of Huaxia University has a very rich collection of books. In the whole of China, it is estimated that only the Imperial Capital University can surpass the collection of Huaxia University.
 The entire huge library has everything from the most basic books to the books in the professional field, and all the books are numbered. The location of the books can be accurately found in the internal library network, which is very convenient to find.
 After more than ten minutes, Qin Yi returned to his seat with a pile of books. There were more than ten books, including mathematics, physics, chemistry, biology, and even literature, art, music, etc. It was very miscellaneous. In other words, reading should be changed to read, so that it will not be tired and it will be easier to absorb.
 "Encyclopedia of high school mathematics knowledge~"
 Qin Yi picked up a book and began to look seriously. Although he said that he started learning from basic things, Qin Yi couldn't learn the content of elementary school and junior high school. At least naturally, he started to learn from high school.
 In high school mathematics, Qin Yi learned very well, and he almost got a full score in the college entrance examination, so when he learned this complete high school mathematics knowledge, it was also very easy, without a trace of difficulty.
 "My memory has improved a lot, and I can almost never forget it."
 Soon, Qin Yi discovered a huge change in himself. Although he had studied mathematics in high school for three years, he didn't know how many questions he had done, and he remembered many things very firmly.
 But after all, I am also a junior now, and I haven't learned these things for a few years, but I read the book very fast, almost ten lines at a glance, but I remember the content of the book clearly, never forget it, and then combine it The experience of studying in high school in the past quickly made things clear.
 "It seems that the old man really didn't brag. This genetic optimization solution is really amazing. It can really develop the brain, and my physical fitness has increased a lot."
 Qin Yi sighed at the magic of genetic optimization fluid while reading the book.
 "Bragging, I have to brag~"
 In his mind, inside the technology tower, the old man couldn't help blowing his beard and staring.
 In less than 10 minutes, a thick book of high school mathematics knowledge was read.
 "Reviewing the old and learning the new, what the ancients said is still very reasonable. If you learn the mathematics knowledge in high school from scratch, your understanding of mathematics is much deeper."
 "Many people think that mathematics is useless, but in fact mathematics is the real foundation of modern scientists. Without breakthroughs in mathematics, there is no way for scientists to achieve in-depth development in other fields."
 "The real effect of mathematics is not reflected in the test-oriented education, but in the future mental thinking. Learning mathematics is a process of thinking exercise from simple to complex. Many people think that mathematics knowledge will be useless in the future. It is true that if you are not in the future. Basically, you don't need much mathematics to do related academic work."
 "On the other hand, people who are good at mathematics tend to have clear thinking, coherent logic, and better subjective initiative in dealing with many things. Many people solve problems with stupid methods, they can often use their own thinking to hit the nail on the head. And it is very useful to have all kinds of reverse thinking and transformational thinking as the accumulation grows.”
 Qin Yi closed his eyes and kept recalling the knowledge of high school mathematics in his mind. He also thought about many of his classmates in high school. People with good mathematics scores often think that they have good grades in science, because science requires continuous thinking. It's easy to understand, hard to understand.
 People with poor math scores often choose to study liberal arts. Many things like liberal arts are rote memorization, which is very different from the activity of science.
 "It seems that I still need to study more mathematics in the future.
 I need to exercise my thinking ability more. At first, I felt that learning advanced mathematics in mathematics is basically out of the realistic needs. Now it seems that my understanding is still too superficial. "
 Qin Yi put down the math gently, picked up the detailed explanation of high school physics knowledge, and continued to read it. Qin Yi also studied physics in high school quite well, and he also got a very high score in the college entrance examination that year.
 Revisiting the physics knowledge in high school again, Qin Yi learned it very quickly, turning a page in ten lines at a glance, and reading a thick detailed explanation of high school physics knowledge.
 "Qin Yi, did you gain anything after reading it?"
 In his mind, the old man was a little bored to chat with Qin Yi. After Qin Yi read the physics knowledge in high school, the old man naturally knew very well the level of civilization development on this side of the earth.
 "The harvest is okay."
 Qin Yi smiled and nodded.
 "Then I will test you. Do you know how to calculate the mass of the earth?"
 The old man smiled and said, turning his eyes.
 "What's so difficult about this, according to the law of universal gravitation, F=GMm/R^2, where G=6.67*10^(-11), M is the mass of the earth, m is the mass of an object, and R is the radius of the earth. F= m*V^2 /R is finally simplified to M = V^2*R/G , V is the speed of the earth's rotation (the speed can be obtained by knowing the radius of the earth), and the mass of the earth can be calculated by bringing the data in. "
 Qin Yi didn't take it seriously. The calculation of the planet's mass needs to apply the law of universal gravitation. As long as you know this, you can easily calculate the mass of the earth, which is not difficult for Qin Yi at all.
 "Don't study hard, you remember these formulas, numbers and the like, but if you use this tool to measure the mass of the earth, can you calculate it?"
 In his mind, the old man didn't seem satisfied with Qin Yi's answer, he said with a smile.
 Then, in Qin Yi's mind, a picture appeared. In the picture, a thin wire hoisted a slender magnetic needle from the middle, and two lead balls were placed on both sides of the magnetic needle not far from each other.
 "Can this thing measure the mass of the earth?"
 When Qin Yi saw this thing, he was at a loss, and he didn't know why.
 "Of course, this thing is still invented by your scientists on earth to measure the mass of the earth. It is called a 'torsion balance'. In the 18th century, your scientists on earth, Cavendish, relied on this thing to calculate out of the mass of the Earth."
 The old man nodded affirmatively, and then began to talk about the origin and function of the 'torsion balance'.
 The basic principle of a torsion balance is to connect two weights of the same mass at a certain height at both ends of a rigid rod, and hang them with a torsion wire through the center of the rod.
 The scale rod can rotate freely around the torsion wire. When the gravitational field is not uniform, the gravitational force on the two masses is not parallel. This slight difference in direction induces a small horizontal component of force on the two masses and creates a moment that rotates the suspension system around the torsion wire until it is balanced with the torque of the torsion wire.
 In the 18th century, one of the problems that scientists on earth have been worrying about is how to calculate the mass of the earth. Until 1798, Cavendish used the 'torsion balance' to finally calculate the mass of the earth, which is about 60 trillions of tons.
 Because the measurement calculated the mass of the earth, scientists soon calculated the density of the earth. Soon, scientists used the same method to measure the even greater mass of the sun, which is 300,000 times the mass of the earth. For 2 × 103o kg.
 Then the masses of other planets in the solar system were also measured one after another. The seemingly simple 'torsion balance' was able to calculate the mass of the enormous cosmic celestial bodies. The fundamental principle is the law of universal gravitation.
 "I see, but why didn't we learn these things in high school?"
 After listening to the old man's instructions, Qin Yi became enlightened. Then he frowned and pondered. Among them, with the physics knowledge in high school, it is not a problem to calculate the mass of the earth by himself. You must know that in the 18th century, scientists were already able to think about it. Come up with a way to calculate the mass of the earth.
 But I never thought about this issue, I just memorized it by rote, and kept calculating in the sea of ​​questions. Although I already knew a lot of things, when I really wanted to calculate the mass of the earth, I was discredited.
 "In my opinion, there are actually quite a few problems with your current education in Huaxia. One of the most serious ones is exam-oriented education, which only depends on the results of the exams. As for other things, you don't care at all."
 "Maybe in the exam, you are all very good, but when you really come to scientific research and exploration, you still need to cultivate your ability to do and think more."
 "That's the only way to really produce great scientists, not nerds who can only do problems."
 The old man pondered for a long time. It has long been connected to the entire earth's network, so it is very clear about the education situation in various countries and regions around the world. Regarding the education model on China's side, it also quickly discovered many problems.
 Today, just relying on Qin Yi, immediately exposed a lot of problems. As a student of a top institution like Huaxia University, I will not talk about the practical ability. The ability of independent thinking and exploration alone makes it very disappointment.
 "It's true~"
 After listening to the old man's words, Qin Yi thought for a long time and had to nod his head to admit it. Although he could find a lot of points to refute the other party, he was speechless based on everything he had experienced.
 When I was in high school, I was very nervous about studying. If I encountered something that was not tested, the teacher would simply choose not to teach it. When I encountered a class that did not require testing, such as music class, physical education class, etc., other teachers would habitually come to occupy it. Classes, etc., all this is enough to show that the current education is exam-oriented education.
 It cannot be said that this kind of education does not have any benefits and advantages, but the drawbacks it brings must also be looked at directly. Many things cannot be avoided at all, and the impact it brings is also very far-reaching.
 PS: After signing the contract, everyone can strongly support a wave~~~
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 The first industrial revolution, the steam engine turned the British Empire into a sun-down empire 
 The second industrial revolution, the internal combustion engine propelled the wheel of history, the electric lights illuminate the dark night 
 The third industrial revolution, the Internet turned our planet into a global village 
 University student Qin Yi was lucky to have obtained a science and technology tower, which opened the interstellar industrial era. Since then, the solar system has become our back garden. 
 We develop agriculture and build space factories in space; we build moon cities on the moon and mine resources; we mine asteroids in the Kuiper Belt … we will also look at the vast universe and the starry sky
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 After suffering from a heat stroke while working under the scorching heat of summer, Lu Zhou, a hardworking but poor university student, somehow becomes the owner of an advanced technological system. With the cheat given by the system, his university life changes overnight.
 A Master’s degree? Easy.
 PhD? Not a problem.
 From a nobody, he quickly becomes a huge celebrity in the world of science. With the missions given by the system, he is on his way to winning a Nobel Prize.
 “System, can points be exchanged for money?”
 “No.”
 “F**k, what use are you then!?”
 “This system will make you the ultimate scholar, the kind that lords over all of humanity. What use will money be to you?”
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 "You have successfully been promoted to the extraordinary, the sixth level of dreamer - master of nightmares." 
 Twenty-seven major professions, three-thirds and nine-levels, viruses and natural disasters are invading the world, alien races are eyeing them, human emperors are sealed in the golden ancient palace, cults are tempting the world to fall into the abyss, and indescribable gods are fooling weak humans. But don’t worry, The thousand-year-old ancestor has returned from his sleep. 
 He had helped the poor and become rich in the cyberpunk city, defeated the heroes in Academy City, had a chess discussion with Cthulhu on the bottom of the sea, and the people in the sect undoubtedly wanted to kill him, and drank nuclear wastewater until dawn. But be careful, when you look into the abyss, the abyss will give you a big mouth. 
 "May all human beings betray the gods and become their true selves. The remaining flames of the night will be extinguished. If there is no light from now on, I will ignite myself and become the only candle to illuminate the darkness."
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 "We will die first to respect you. Which of you dares to follow?" 
 The surface of the earth is in nuclear winter, and a majestic city stands on Mars. But now a group of Chinese scientists have chosen to self-destruct just to send a biological computer back... 
 Ning Wei, who had just accepted the future biological computer, was thinking about how to use the school's rules to make a fortune by brushing SCI... 
 "A small hammer is forty, a big hammer is eighty" 
 Starting from writing papers, Ning Wei wielded the hammer of science and technology to break the shackles of China's science and technology and rewrite the global science and technology landscape. How much is this hammer worth? ’ 
 ★Important reminder: This is a daily essay written by a top scholar. Please proceed with caution if you don’t like daily essays...
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 Xiao Bing, who used to be a top soldier in mercenary and came back to normal life because of the death of his best friend. He started over, played dumb and coped with difficulties. He stood on the bones of others and held beauty by his side. Finally, he succeeded and became the emperor of the city.
 “Brother Bing, please protect my little sister as well as my families carefully. I feel lucky to accompany you during these 6 years. It is my honor to go through fire and water with you. I’m not regretful!”
 I’m not regretful!
 Thinking of what Su Peiya had said before dying, Xiao Bing clenched his fists tightly and cried. He made a decision to protect Su Peiya’s families before finding the spy of Long Men and to make rightful claims for Su Peiya.
 Xiao Bing did not love Su Peiya, but he regarded her as his only best friend!
 He unfastened the seat belt when the plane landed safely. Looking at the urn in his hands, he sighed, “We have arrived at Jiang City. You get home now, Peiya.”
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 No one can escape this crisis in the last days, and some are just gods.
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 By coincidence, Li Yunmu found a super machine from humanity’s age of darkness. From that point onwards, his ordinary life would never be the same! Aptitude? Innate talent? What are these? Could they be eaten? 
 I have neither aptitude nor innate skill, but my shadow can level up using hacks. Experience, Ability points, battle prowess… all of them could be hacked. Even while he is asleep or tired, he could still increase his skills.
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 Si Lingling: “Go away, my old lady is not familiar with you.” 
 Jun Moyao: “The baby has given birth to two children, are you still unfamiliar?” 
 Si Lingling: “I gave birth to my own mother, what is it to you?” 
 Fans: “Wow~ rely on rely on rely on rely on rely on rely on rely on, this melon is too big, I can’t eat it alone, so I have to share it with all beings.” 
 Star Network: Did the boss confess the anchor success today? 
 Has the anchor blasted the boss out again? 
 I’m going, it turns out that the anchor is the real boss! ! !
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 After surviving the tenth year of natural disasters after the nuclear-contaminated water was discharged into the sea, the Blue Star volcano erupted, and the gamma ray burst, Xia Qing walked out of the safe zone with her head held high. 
 Don't let anyone stop me. I'm going to farm!
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 On the desolate barren planet of Rennes, an Asian teenager named Lin Yuan receives an admission notice for the Empire’s best military academy San Romia. So begins his life changing military school career.
 Lin Yuan: Wow! This school’s really great! Everyone even has a separate bedroom! But…why does my next door roommate always knock on my door? And all day long he keeps bothering me, God! So annoying!
 Lin Yuan: I’m a Beta, my biggest wish is to meet a nice Beta girl, get married, have children and live in peace! Wait a minute… Why does my body suddenly feel strange? Why does this medicine look like drugs to prevent Omega from entering estrus?
 Trembling in his roommate’s arms Lin Yuan blushes and tries to push off his chest: “Wait…wait a minute…I’ve always thought of you as a friend. Don’t do this…..ah….”
 At that moment, Lin yuan seems to feel that the universe has malicious plans for him. The world is collapsing, who will tell him why the script is so wrong?
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 Travel to Naruto and start with a knife. 
 Looking at Itachi Uchiha, who might become his brother-in-law, Yusuke sharpened his knife and smiled: "Izumi and Sasuke fell into the river, who do you save first?" 
 Uchiha Itachi: "..."
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 Prometheus, the infinite fortress of time, a crossover point for the infinite worlds of machine wars, Our protagonist, Xiao Ran, was put into great pressure due to having only attributes that do not exceed 10, making him as weak as a chicken. But being familiar with the storyline of each mission world, Xiao Ran exclaimed that the world would be his.
 ========== ========== ========== ========== 
 Mission world: “Gundam SEED” -&gt; “Macross F” -&gt; “Gundam 00” -&gt; “Ultimate Mission” -&gt; “Kakumeiki Valvrave”-&gt; “Gundam 0079” -&gt; “Gundam Seed Destiny” -&gt; “Super Robot Wars OG”
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 Lin Ye travels through parallel worlds, but finds that in this world where VR is highly developed, games are extremely scarce; with the support of the system, Lin Ye directly develops a series of high-quality brain-burning games; confusing cases, unexpected killing methods, hidden behind the scenes The murderer behind the scenes... When players around the world were carnival for the game designed by Lin Ye, Lin Ye received a call from the police: "Hey, Lin Ye, come to the police station."
 Lin Ye: "I am a game developer, and I also need to file for the record?"
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Interstellar Industrial Age

Chapter 9, How to Calculate the Mass of the Earth

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Interstellar Industrial Age

Chapter 9, How to Calculate the Mass of the Earth

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