Zhu Yunye didn't understand either. He turned slightly to Han Du and asked in a low voice: "What did Yang Qing do to win the first place in one fell swoop?"
Han Du smiled inwardly, but with a calm look on his face, he explained in a low voice: "He speculated through experiments that the earth under our feet is actually rotating."
"What did you say? The ground beneath our feet is turning?" Zhu Yunye frowned and glanced down at his feet.
It's not moving. Where is it moving?
He also secretly stepped on it hard, but there was no feeling of any rotation.
"Isn't uncle joking? How can the earth be so thick that it can rotate? If it is really rotating, wouldn't the force be beyond imagination?"
"It's indeed beyond imagination!" Han Du nodded.
Zhu Yunye's eyes were stunned. Is the earth really rotating? He looked down again for a moment, but saw no sign of any movement under his feet.
"Uncle, why is this happening?"
Han Du rolled up his sleeves, moved closer to him, and said patiently: "Yang Qing made a huge pendulum. According to common sense, if the ground under our feet does not move, the pendulum should go back and forth on a line. Swinging, right?”
"Isn't it like this?" Zhu Yunye suddenly became confused, "I have also seen a pendulum, which swings back and forth in a straight line."
Han Du chuckled, "Isn't the pendulum that the emperor saw not big, only two or three feet in size at most?"
Zhu Yunye nodded subconsciously. When he saw the pendulum for the first time, he became interested in this novel thing and observed it carefully, but it was indeed like Han Du said, what he saw was nothing like it. They are very big and can be placed directly on the table.
Could it be that this is also related to the size of the single board?
"The small pendulum actually does not swing back and forth in a straight line. It is just because the difference in swing is so small that it is difficult to distinguish with the naked eye, which makes us think that it swings in a straight line." Han Du continued to explain.
"Yang Qing keenly observed this subtle difference, so he made a huge pendulum. Then he discovered the obvious difference. The pendulum did not swing back and forth in a straight line at all, but moved every time it swung. It makes a subtle difference."
"Your Majesty, think about it. If there is a difference, then there must be a reason for such a difference. Later, after careful investigation, Yang Qing finally concluded that it was the rotation of the earth under his feet that caused such a difference."
Zhu Yunye listened carefully to Lao Longqumai and finally understood it.
But at the same time, more confusion arose in his mind, "How big of a pendulum did Yang Qing make?"
"Probably, three stories high!" Han Du replied with a smile, "It's inside the Institute of Physics. If the Emperor wants to see it, he can go see it at any time."
"Hiss!" Zhu Yunye just thought for a moment that there was a three-story-high pendulum, and he admired Yang Qing's talent.
He is able to detect subtle differences that others cannot detect, and this is what makes him special.
"Look, I must go and take a look, but not now." Zhu Yunye winked at Fang Xiaoru who was standing on the high platform.
After a pause, Zhu Yunye touched his chin and asked: "Then, does uncle think Yang Qing's statement is right or wrong? Is the earth under our feet really rotating, but why can't we feel it at all? If the earth is If it turns, then how come we didn’t get knocked down?”
Of course Han Du knew that Yang Qing's conclusion was correct. Who doesn't know that the earth rotates as long as they have studied junior high school physics?
However, he did not explicitly say that Yang Qing was right. Some things require students to study and verify on their own, and at the same time, it also allows people to slowly accept it.
"Anyway, Yang Qing ruled out the influence of the beams. He even thought it was the influence of the wind, so he moved the pendants into the house and sealed the windows tightly to prevent any wind from blowing in. The result was still that every day Every swing makes a difference.”
"The only thing that can affect the swing trajectory is the earth. Apart from the rotation of the earth itself, I really can't think of other impression factors."
After Zhu Yunye heard this, he had to nod slightly. After excluding all factors that can affect the pendulum, no matter how incredible the final conclusion is, it is probably very likely to be true.
"The knowledge in the academy is really profound. A simple pendulum can reveal such huge secrets." Zhu Yunye nodded first, then shook his head. It was not clear whether he wanted to express agreement or deny.
"But there's another problem."
"Your Majesty, please speak." Han Du agreed with a smile.
"If the earth is rotating, then why can't we feel it at all?" This is where Zhu Yunye feels most confused. If the earth is rotating and the pendulum can show differences, then people should also notice it, but since ancient times No one has ever felt this way.
Han Du smiled slightly and said, "I have a guess."
"Uncle, tell me quickly."
"I think that when we stand on the earth, we are rotating with the earth. In this way, the earth is relatively stationary to us, so we cannot feel it."
This answer obviously did not satisfy Zhu Yunye. He quickly asked: "But the single pendulum is also placed on the ground, so why is there a difference?"
Han Du took the answer to explain to Zhu Yunye, "The pendulum is indeed set on the ground, but the rope of the pendulum is soft, and the rotation of the wooden frame does not affect the pendulum's ability, so we can see the difference. "
"And Yang Qing also did an experiment on this. He made a pendulum connected with wooden poles. What did the emperor guess?"
Zhu Yunye's eyes widened and he said in an excited voice: "Is this pendulum just swinging back and forth on the same line without any difference?"
"exactly!"
Zhu Yunye slapped his thigh excitedly, "Wonderful, it's so wonderful! Using a soft rope to eliminate the influence of the rotation of the earth and discovering the difference, this experiment is so well designed! How did Yang Qing come up with the idea?"
"No! When this is over, I must go and see the pendulum with my own eyes. I will also call Yang Qing to me when the time comes. I will ask him how he came up with the idea."
"Yes, I will give my orders now."
The applause from the audience was still lingering. Yang Qing stood up amidst the cheers, turned around and bowed to all the teachers and students, and then walked onto the stage step by step.
Seeing Yang Qing coming in front of him, Fang Xiaoru handed him the gold book.
Yang Qing quickly straightened his clothes, then leaned over and took it with his hands raised.
"Congratulations, you won the 100,000 yuan award from the Institute of Physics! This is a compliment to your knowledge and an encouragement to you. I hope you can continue to study in the future!"
"Thank you, sir!"
