"Balance?" Xiang Xin looked at Cheng Jinzhou in confusion and said, "If you refer to the balance you gave you last time, it would be a very good one."

"I know, I know." Cheng Jinzhou was happy, secretly looking at the content on the ring face, and smiled: "I have a little itchy hands recently, thinking about whether I can make a balance by myself, but I don't understand many things..."

Xiang Xin showed a slight disapproval and said, "Balances are something that only the official astral warlock can make. You only need to understand and use it now."

She actually wanted to say: You don’t even need to pay too much attention to using it.

People who have been instilled with the greatness of astrology since childhood have a religious obsession with astrology, religious devotion to rank, and religious discrimination to the weak...

The obvious feeling of this discrimination made Cheng Jinzhou very uncomfortable. He had just found a reason for it, but now he was very unhappy with the other party's attitude and said with a sour air: "I don't think it's so difficult to make a balance. If there are enough materials, it can be easily completed."

"Half-understanding." Xiang Xin said mercilessly: "The balance is not simply placing a cross bar in the center, and then you can measure the weight. The equal distances on both sides are just the simplest requirement. It also involves very complex mathematical..."

"It's just a balance of moments." Cheng Jinzhou shrugged and said, "You just want to say that if an object is moved for a distance, the torque it generates should be the same, so the length of both sides of the balance should be equal..."

Xiang Xin's eyes were as round as her bald head.

The so-called moment balance is the principle of leverage. Archimedes said: Give me a lever and I can pry up the earth, which refers to the principle of leverage: In theory, put a cross bar on the fulcrum, in order to balance the two sections of the fulcrum, the farther away from the fulcrum, the less effort is spent.

Ordinary people know from common sense that as long as the lengths of the two ends of the crossbar are equal, the balance between the two ends can be ensured. However, in actual use, the two sides are often unbalanced. At this time, you need to know the relationship between distance and mass - distance multiplied by mass equals distance multiplied by mass. It is simple to say, but it is not easy to prove.

The main purpose of the balance that can be used is to measure quality, and to ensure its accuracy, the most common pallet balance cannot just use weights - a game code with an order of magnitude less unit mass (Note 1), which is also a necessary measure - it uses the calculation formula of the leverage principle.

When she was said to be the most proud, Xiang Xin's sneer also restrained. At this moment, she began to admire the master's eyes again.

Cheng Jinzhou raised his eyebrows provocatively. Compared to mysticism, he is considered to be at the level of elementary school students, but compared with these basic knowledge, the earth technology that has been tempered through thousands of times can completely torture the primitive people. Thinking of the newly obtained "Mechanics and Metrics" is the high-end knowledge of this era, he couldn't help but show it out and say, "Do you know how to determine the position of balance?"

"The weight is equivalent." Xiang Xin has long been familiar with these contents.

Cheng Jinzhou deliberately laughed out loud: "Superficial."

"What did you say?" Xiang Xin's right shoulder began to shine again.

Cheng Jinzhou took a step back and said tough on the surface: "Do you want to use force to explain the problem?"

Xiang Xin snorted, shook her arms, the light went out, and continued to hold her head high and said, "If you can't tell anything, I'll cause trouble for you again."

"How difficult can it be." Cheng Jinzhou curled his lips, picked up a straw, held it horizontally in his hand, and said, "If you want to have a complete balance between the two sides, this simplest balance will be the same as nothing, so there is no need to discuss it, but if it has a certain inclination angle."

Cheng Jinzhou slowly placed the upper right and lower left of the wheat straw at a 45-degree angle, saying: "Now you see, the lever actually has an angle with the ground. At this time, the torque is no longer a result of length and mass. A 45-degree trigonometric function value should be added, right?"

Mathematics is a movement that discovers the failure of the old method in the continuous pursuit of precision, then designs compensation methods, and finally fails again.

The principle of leverage is very simple. Humans BC knew that when its application uses trigonometric functions, it takes 1,000 years of development.

Xiang Xin understood the disadvantages of ordinary balances, but she didn't expect that Cheng Jinzhou also knew it, and he was stunned for a moment.

This is a teenager! Xiang Xin secretly estimated that when she was in her teenage years, was she so outstanding...

The two looked at each other for a moment, Xiang Xin raised her chin again and said, "I will bring the astrology warlock materials. If it is not enough, I will buy it again. If you can make one..."

"I won't go to Nanling." Nanling is the territory of the Prince of Nanling. Even if there is no Sith Temple and two perverted Zhao clans, Cheng Jinzhou would not be willing to find trouble.

"Although I can't change your father's decision, I will persuade him that if you can really complete a high-precision balance." Xiang Xin already looked at Cheng Jinzhou in a straight-up manner. Many skills in the process of making balance are kept confidential in the Astrology Association. In other words, she actually won't make a high-precision balance, and the other party can tell the moment balance, which is already beyond the scope of ordinary students.

Cheng Jinzhou snorted disregardously and said, "This bet is really light for you, so for me, you can do it."

His hands-on ability is limited to that of middle school students. He is a real playboy who never worrys about taking exams.

Xiang Xin raised her head in surprise and began to re-doubt Cheng Jinzhou's generosity.

"Okay, I have something to do here, so you can go out first." Cheng Jinzhou pretended to start driving people. He did have one star alliance point to be upgraded.

The momentum was weak, and the young first-level star warrior couldn't say anything. He left the granary obediently. His attitude of being arrogant at first and respectful at the other side made the boys outside look at each other.

Cheng Jinzhou squinted his eyes and smiled, and said to the ring with a very successful taste: "Let's go ahead."

"30,000 words." Customer service 010 has been impatient for a long time.

"Can't have that many words." Cheng Jinzhou blew sweat on his forehead and said, "The astrology warlock just saw the situation in the granary. It suddenly became much less and would be discovered."

30,000 words, but it costs 60 stars, 6 tons of grain, which is as much as 6 cubic meters, and is easily discovered.

Customer Service 010 said without any patience: "13,000 words. Confirm?"

"Just it." Cheng Jinzhou was actually very anxious.

"My Days in Tehran" Customer Service 010 said coldly: "Congratulations, the Covenant level has been raised to 3."

Cheng Jinzhou suddenly opened the door of the granary, and the noon sunlight rushed towards him, and a sudden enlightenment arose.

"The era of mathematics, my era." Cheng Jinzhou thought silently in his heart and nodded silently.

...

Game code: In the use of balance, the smallest weight can be 1 gram. If it is small, it will make it inaccurate in daily use. For this reason, we use the lever principle so that a larger weight fixed to the balance can display smaller accuracy, such as 0.1 gram.
Chapter completed!