The large amount of spices, ebony, sweet potatoes and silver that Zhang Yanling brought back made the bureaucrats of the Ming Dynasty have to believe that this Hou Ye had really made a voyage.

Moreover, the bureaucrats of the Ming Dynasty also began to have to accept the concept of the earth, and even because of this, more and more people in the Ming Dynasty began to accept this concept.

Especially, after the explanation that people on Earth did not fall because the Earth has gravity spread.

However, not all people in the Ming Dynasty are interested in paying attention to what this gravitational force is all about, to study why the earth has a gravitational force.

Most people still eat when they should eat and sleep when they should sleep.

Of course, there are exceptions, and Wang Wensu is now struggling with the question of why the earth has gravity.

The wealth of the Ming Dynasty and the Ming Emperor Zhu Houzhao's emphasis on natural sciences such as Han Moxue enabled Ming scientists like Wang Wensu to have enough energy to study knowledge without worrying about livelihood or even life ideals.

Boom!

On a three-story pavilion with red walls and green tiles in Beijing Normal University, after Wang Wensu held an apple in his hand, the bright red apple fell into a pool of blue pools downstairs, bringing ripples.

After the water surface returned to calm, Wang Wensu put down the identical apple carved in stone, and the stone apple fell into a pool of blue pool downstairs again, bringing wisps of ripples.

"People do not fall on the earth because of gravity, and now it can be seen that objects of different weights fall into the water, causing obvious differences in waves, which shows that the greater the weight, the greater the gravitational pull of the earth on the object, but I don't know how to calculate this gravitational force."

Wang Wensu racked his brains for thought, and then tried to throw two mud and stones of the same weight but different volumes into the pool.

There was another bang.

"Goose goose goose, song to the sky", Da Vinci, a student of the Department of Liberal Arts and Chinese Literature of Beijing Normal University, who was over the age of six, happened to recite Tang poems under the apple tree by this pool, so he couldn't help but be taken aback, and when he looked back, he saw that it was Wang Wensu, who only bowed down first, and then took the Zhengde three-year Hanlin Book Society version of "Three Hundred Tang Poems" in his hand and prepared to go elsewhere to recite Tang poems.

But on the way, Leonardo da Vinci couldn't help but sigh in his heart: "In this empire, artists and scientists are really rich and can seriously conduct their own research, without worrying about hunger." ”

After Leonardo da Vinci sighed, he couldn't help but be more determined to learn Chinese and create art and science in the Ming Dynasty, so he memorized Tang poems again: "Goose goose goose, song to the sky, white hair ......"

Leonardo da Vinci found it very difficult to learn Chinese, especially the ancient poems of the Eastern Empire, so he had to pick up the book and read it from right to left, thinking: "I heard that this poem was written by a Han man named Luo Bingwang when he was seven years old, and he can write such a difficult poem to memorize at the age of seven, and the intelligence of the Han people in this empire is really terrifying!" No wonder they can invent so many things! ”

Although Leonardo da Vinci thought the Han people were very smart, Wang Wensu did not think he was very smart, and he found that he still could not determine the calculation method of force and the earth's gravity, and as a mathematician, he felt a great doubt about his intelligence.

Wang Wensu had to ask Zhu Houzhao again: "Your Majesty, forgive the ministers for being ignorant, so I have to take the liberty to disturb Your Majesty, the ministers really can't find a way to calculate the power, so the ministers can't be sure how to calculate the gravitational force of the earth, and please give your Majesty advice!" ”

Zhu Houzhao understands Wang Wensu's doubts very well, after all, it is still the twelfth year of Zhengde, Galileo and Newton, the founders of classical physics, have not yet appeared, and it is still the era of great geographical discoveries, the period of great development of astronomy, and even Copernicus put forward the heliocentric theory It has only been four years, and Bruno has not yet been born, and it is naturally impossible for Wang Wensu to think of all the calculation methods in classical physics at once.

"This is not difficult", Zhu Houzhao said casually.

"Isn't that hard? The minister thought about it for a long time and didn't come up with a way! Wang Wensu thought so in his heart, and immediately arched his hand and said: "Please also ask Your Majesty to give advice!" ”。

"In that case, I'll ask you first, can you be sure what this thing has to do with force?" Zhu Houzhao asked.

"I can be sure that the heavier the object falling at the same height, the greater the force," says Wang.

"That's enough, you think, in that case, you can think of the force as proportional to the weight of the object, and this proportionality means that the greater the weight of the object, the greater the force, and then you can make your own symbol to represent it, like this."

Zhu Houzhao used a brush to write F∝m on rice paper, just as he taught a junior high school student: "This means that the force is proportional to the weight."

Zhu Houzhao has already promoted Arabic numerals, Latin alphabets and some special characters needed by natural sciences to Beijing Normal University, so at this time, Wang Wensu was no stranger to this formula, and only nodded obediently on the side.

"Then you set a coefficient, expressed by g, and you assume that the multiplication of g by the weight is the gravitational force of the earth on the object, isn't it F=mg, and then you can just know the weight of the object and what this g is to know how much force there is?"

As soon as Zhu Houzhao said this, Wang Wensu suddenly realized: "Your Majesty Shengming! ”

Zhu Houzhao only smiled faintly, he didn't think this was so difficult, after all, this could be mastered by a middle school student in later generations, but he could also understand why Wang Wensu was so shocked, after all, this way of thinking was indeed a great inspiration for the Ming Dynasty people of his time.

After Wang Wensu was inspired by Zhu Houzhao, he also knew that all he needed to do now was to determine what G was, but because of this, he was even more crazy than before looking for Zhu Houzhao, and began to think about how to measure G.

Zhu Houzhao was also very supportive when he found out, saying that if Wang Wensu needed help, he could go directly to the school, and the school department could not shirk.

However, Zhu Houzhao did not directly tell Wang Wensu what the gravitational acceleration is in general, he wanted Wang Wensu and other Ming Dynasty people to calculate it themselves, which is not only to let the people of the Ming Dynasty know the answer to what the gravitational acceleration is, but also to let them know how to find the answer.

After the concept of the earth was deeply rooted in the hearts of the people of the Ming Dynasty, Xia Yan and these people thought of letting the Ming Dynasty seize global resources as soon as possible, while Wang Wensu thought of studying more in-depth physics, Zhu Houzhao not only supported the former, but also supported the latter, he knew that it was impossible for Galileo Newton and these figures to be born to establish classical physics, and it was necessary for the Ming Dynasty's own scientists to establish various laws of physics and mathematics and other natural sciences.

Wang Wensu is still working on the determination of the earth's gravity (gravity), and Xia Yan and Zhang Yanling have now arrived at Haojing in Xiangshan County (Hong Kong) in Liangguang in the early spring of February in the thirteenth year of Zhengde.

Now Ho Jing has become the shipping center of the entire South Daming Sea.

In May and June every year, there are countless government-run or private Daming galleons carrying raw silk, cotton cloth, silk cloth, soap, glass, high-carbon steel knives and springs purchased on the mainland, and in May and June, they take advantage of the monsoon to transport them to Japan, and then exchange these goods for silver, and return to Haojing after November by taking advantage of the monsoon.

In Daming, raw silk, cotton cloth and silk cloth with the promotion of mechanical spinning industry, the cost has been reduced to a very low level, and soap, glass, high-carbon steel knives and springs and other things are high-tech products in this era, and only Daming can produce, so the profits of selling to Japan are very high.

Basically, the profits are more than 100 percent, and some are even as high as 200 percent.

The profit of the merchant ships of the Ming Dynasty was more than two million taels of silver once a year.

In the old days, of course, this route was controlled by the Petite Franc (Portugal).

However, after the Ming Emperor agreed with Lin Ting's choice to open the sea in Liangguang and train the navy, which is now the navy, especially after the Ming navy was completely annihilated and attempted to occupy the small Franc fleet in Manchraka (Malacca), this route was owned by the Ming Dynasty.

From Japan to Manchuria, there are basically only Ming ships in the entire Daming Sea.

And now, with the opening of Ho Kyo, this route has officially become a fixed route from Ho Gung to Nagasaki, Japan.

However, with the opening of the port of Matsue, the future route to Japan will undoubtedly become from Shanghai Prefecture in Matsue Prefecture to Nagasaki, Japan, so the shipping status of Hokami will undoubtedly be affected.

The Liangguang officials, who had tasted the benefits of trade because of the opening of the port of Haojing, were very worried about this, and Wang Hong, the governor of Liangguang, even repeatedly went to the court to hope that the imperial court would not open the sea and Songjiang.

Of course, Wang Hong couldn't stop the imperial court's decision.

Therefore, now that Songjiang opened the port, the officials of Liangguang began to become more anxious, and after Xia Yan arrived in Haojing, Wang Hong and other officials of Liangguang immediately asked Xia Yan what he could do.

Xia Yan also thought of a way first, and the way was to open up a new route.

"Colleagues, Haojing's dominant position in Japan in the future may be replaced by Songjiang Mansion, but this does not mean that Haojing will decline because of this, and now this official is here with His Majesty's will to open up new routes for Haojing, where is the biggest advantage of Liangguang, do you know?"

Xia Yan asked.

Liangguang and other officials hurriedly said in unison: "Please make it clear to the minister!" ”

"The advantage of the two Guangxi is that the Haicheng port of Manraka is in our hands, and we can open up a route from Haojing to Haicheng and then to India, and transport India's pepper, iron ore, copper ore, and sumac, sandalwood, ivory, and musk back to my Daming, especially the ore, I Daming is now short of ore!

His Majesty the Emperor in order to protect the feng shui (protection of the environment and ecology) and reserve resources of our Ming Dynasty, coupled with the opposition of some stubborn ministers to open the mountain and quarry, it is not difficult to mine the ores in the territory casually, and these ores from abroad can only be transported back first! This is what the officials and people of our two provinces need to do, and this official believes that this one route will allow us to levy no less than the current amount of taxes in Guangzhou, not to mention, we can also transport back the gold and silver mines on the Cape Verde side along Goa, India, and earn more money when the time comes! ”

As soon as Xia Yan said this, the officials of the two Guangxi and Guangxi present all laughed, and Wang Hong smiled first: "Naturally, as long as the imperial court is willing, if this route is opened, then the gold and silver will definitely come in like flowing water, why should the officials and people of my two Guangxi not increase their money!" ”