Xueba, I beg you to go and escort him quickly!

Fine!

It seems that he has to explain earlier, and he also needs to make a phone call with the principal himself.

Dean Nie was just about to speak.

"Ring Ling Ling..."

Xu Heng's phone rang again.

"Xu Heng, where have you been? I heard that you have arrived in the capital? Why didn't you call and tell me!"

Wen Ruohuai said it.

Xu Heng, "???"

"Mr. Wen, how do you know I'm going to the capital?"

Wen Ruohuai, "The circle in the capital is so big, if you know a thing or two, you will know!"

What's more, Wen Ruohuai cares so much about Xu Heng!

"But then again, Lu Tianyuan actually heard about it at a dinner party!"

Xu Heng frowned, "So, the Lu family also knows?"

Wen Ruohuai, "The old man of the Lu family called me personally! He said he must invite you!"

"Tonight is just for this night. Tomorrow you will be closed-ended."

"After the end, there is no more time, and we have to go back to the midterm exam, so we all cherish this night of yours~!"

What Wen Ruohuai said hit the point.

"Lu Tianyuan turned down a dinner party, and I also turned down a meeting. Mr. Lu is even more anxious. He's already looking for the squirrel mandarin fish you liked before!"

Xu Heng, "Uh..."

Wen Ruohuai, "Where did you get off the highway? I'll arrange someone to pick you up!"

Xu Heng, "Uh..."

Wen Ruohuai, "Xu Heng, please understand! Mr. Lu is very excited and looking forward to it. You can't live up to his old man's wishes! Right?"

Makes sense.

Xu Heng, "But...the academicians of the research institute seem to have the same idea as you!"

Wen Ruohuai, "!!!"

Geek!

He was very surprised, "What does the research institute mean? Invite you? Didn't you go to participate in the Peking University postgraduate entrance exam examination paper group? How did you get involved with the research institute?"

Xu Heng, "Something happened last time, and it actually has nothing to do with them, but well, they just posted it."

Wen Ruohuai, "%￥#￥￥%..."

"So...there is a time conflict?"

Xu Heng, "Yes."

Wen Ruohuai, "Then this won't work! Let's do it this way! Xu Heng! Let's each rely on our own abilities! Okay? Just tell me the exit of the highway you want to get off and the approximate time!"

Xu Heng gave it.

After hanging up the phone, Wen Ruohuai immediately arranged, "Arrange the helicopter! Let them get ready and go!"

"There must be traffic jams in the capital at this time, it's more convenient for them!"

"..."

After Xu Heng hung up the phone, he sighed and frowned, "Why do you have to come? Hey..."

Dean Nie was completely depressed.

Where did they hear that Xu Heng was coming to the capital? !

Hemp egg!

Why are they all rushing to find Xu Heng?

"???"

"Student Xu Heng, this... this...?"

Xu Heng, "I also really want to know how the news about my coming to the capital got out! But, it's all like this!"

"As soon as you come, let's be safe!"

"As long as you don't delay tomorrow's release."

Dean Nie opened and closed his mouth.

First is the research institute!

Then came Wen Ruohuai and the Lu family!

No matter which side it is, it is an extremely important existence!

If it were him, he wouldn't even know how to make a choice.

So... Dean Nie chose to call the principal to report on the current situation.

Fang Zhonggui chatted with Xu Heng and started chatting.

And the group is also discussing a piece of news.

"The autobiography of the earth is accelerating! There are less than 24 hours in a day!"

"There are 360 ​​and five days in a year, and there are 24 hours in a day. Time flies. Do many people think that 24 hours a day is not enough?"

"This is no longer an intuitive feeling. Scientifically speaking, the passage of time is faster than at any time in the past half century!"

"According to the research of relevant departments, since this year, the rotation of the earth has accelerated in the middle of the year, and the rotation rate of the earth has shown an accelerating trend."

"..."

Xu Heng and Fang Zhonggui also talked about this topic.

Fang Zhonggui, "As we all know, the reference time for the earth to rotate once is 23 hours, 56 minutes, and 4 seconds. During this time, the earth rotates 0.986 degrees around the sun. If the sun is used as a reference, a certain point of the earth rotates once, and exactly Spin against the sun."

"Then, the earth needs to rotate an additional 3 minutes and 56 seconds on the basis of one revolution around the earth's axis. In this way, the earth's rotation plus revolution completes a cycle around the sun's axis, and the time is exactly 24 hours."

"But now, time is running out."

"Student Xu Heng, I think you should be very clear about the power of the accelerated rotation of the earth!"

Xu Heng nodded.

"The group jokingly said that there are fewer than 24 hours a day. Of course, this is also the most intuitive impact."

Fang Zhonggui smiled, "What about you? What impact can you think of?"

Xu Heng didn't think too much, and said bluntly, "Observe the ballet dancers carefully, you will find that when their hands are close to the body, the rotation speed will increase, and when the arms are spread, the autobiographical speed will decrease."

"This is because when the mass of an object is concentrated to the center of gravity, the rotation speed tends to increase."

"The same is true for the earth. When matter gathers closer to the center, the rotation will become faster. Just like the 2011-magnitude earthquake on the coast of foreign countries in 1.8, this caused a large amount of matter to be deposited deeper underground, which shortened the daily life by [-] microns. Second."

"This is the fastest day on earth's rotation since records began."

Fang Zhonggui was a little surprised. He didn't expect Xu Heng to have in-depth research on these things.

If it wasn't for in-depth research, how could Xu Heng know such detailed data.

Ordinary people, at most, say, "There is an earthquake, according to research, so it will be fast", but Xu Heng just gave an example.

Fang Zhonggui smiled and applauded Xu Heng.

Xu Heng waved his hand and smiled, "Professor Fang, don't bury me!"

Looking at the group, everyone had a heated discussion about the less than 24 hours.

Someone mentioned this knowledge point of ballet.

Xu Heng couldn't stand it anymore, and said bluntly in the group, "The ballet is the conservation of angular force, you shouldn't know it?"

"Is it that obscure?"

Everyone turned dark instantly, "%￥@!#￥......"

"Angular momentum is the quantity that describes the rotational state of an object, also known as moment of momentum. If the mass of a particle is m, the velocity is v, and its vector radius about point O is r, then the angular momentum of the particle to point O is L=r×mv .”

"Angular momentum is a vector, and its projection on a certain axis through point O is the angular momentum or scalar of the mass point on the axis."

"The angular momentum of a particle system or a rigid body about a certain point or a certain axis is equal to the vector or algebraic sum of the moment of each particle's momentum about the point or the axis."

"A particle with a mass of m moves in a uniform circular motion with a radius of r around the point O, and the rotational angular velocity is ω, then the angular momentum of the particle to the point O is L=r·mv=r·mrω=mr2ω=I0ω, where I0 is The moment of inertia of the mass point about the center O of the circle."

"." A rigid body that rotates around a fixed axis z with an angular velocity ω, in which each point moves in a uniform circular motion on each plane perpendicular to the z axis, and their circle centers are the intersection points of each plane and the z axis. "

"Therefore, the angular momentum of the rigid body rotating around the z-axis L=ri·mivi=ri·miriω=miri2ω=Izω, where Iz=miri2 is the moment of inertia of the rigid body about the z-axis; Radius, velocity, and mass of a particle moving in a circle."

"The dimension of angular momentum is L2MT-1, and its SI unit is kg m2/s."

Xu Heng explained in detail.

Everyone couldn't help complaining, "Isn't this obscure?"

"@许健大大, why did the earthquake affect the autobiography of the earth?"

Xu Heng, "Simply put, the moment of inertia is the square of the mass multiplied by the radius. Crustal movement, including earthquakes, will affect the distribution of matter inside the earth."

"Generally speaking, just as water flows downward, matter tends to move toward the center of the earth, so that the moment of inertia of the earth will decrease, so that the earth's rotation speed will increase."

Everyone in the group said, "So besides the earthquake, there are other things that may affect the autobiography of the earth?"

Xu Heng, "Even if there is no earthquake, the rotation speed of the earth is always changing, but the magnitude is very small."

"In addition to crustal movement, many factors can affect the earth's rotation. For example, ocean tides, the friction of sea water makes the earth's rotation slow down by about one thousandth of a second every century."

"Another example is seasonal changes. The thickening and melting of ice and snow, especially glaciers, adjusts the distribution of water, making the earth in autumn faster than the earth in spring by about one-thousandth of a second."

"In addition, atmospheric movement, storms, ocean currents, surface rivers, water vapor erosion, and even human activities will all have an impact."

The group leader murmured and asked, "If the autobiography gets faster and faster, how will we be affected, and will we be thrown out by the earth?"

Before Xu Heng could answer, someone in the group shouted.

"Group leader, (to Li Zhao) why are you suddenly not very smart!"

"If you have studied physics in junior high school, you should know that we humans rotate with the earth! If we are in the northern hemisphere, we humans move at about mph! The closer we are to the equator, the faster the speed can reach 1000 mph , proper supersonic speed!"

The group leader, "Um... so embarrassing... I didn't react for a while."

"Then, if you accelerate, faster and faster, what will happen?"

"Have you ever discussed it?"

"Have!"

Someone really stood up, "If the earth's rotation speed is about 17 times the current speed, it will take less than one and a half hours to revolve around the earth in a day, which means that time will pass quickly, and at the same time, we will re- Define time, e.g. calculate time in a year."

"Additionally, since the force of gravity will become smaller and smaller, when the earth's rotation speed increases by a factor of 17, the centrifugal force and gravity near the equator will reach an ideal balance, which means that objects near the equator will not be controlled by weight for longer , and can even fly with ease.”

"Of course, the same is true elsewhere. We will no longer be affected by gravity, even lighter than birds, and we will be free. A gust of wind can take us anywhere. But correspondingly, the climate and ecological environment of the earth It will be affected too. Big changes, because the gravity will be less and the centrifugal force will be greater, the sea water will no longer be bound, and the whole planet will throw up huge waves, destroying all surface life."

Justified!

Xu Heng watched and nodded involuntarily.

In the group, there are different opinions!

Xu Heng shared the content on the phone screen with Fang Zhonggui.

"Professor Fang, do you agree?"

……

PS: New Year's Day!Happy New Year from the author!

Thanks to [Belief] [Tail Number 8570] [Lazy Meow] [I am Eternity] [8674] for their support! .

Chapter 335