mastered the dynamics of two-way emotional changes, and sometimes Xia Lu was quite entangled.

The valuation of classmates with Hao Tian has risen to 3012 points, and most of the increase comes from Hao Tian.

What does this mean?

A fool can figure it out, let alone Xia Lu, whose brain power has reached one star of the elite.

Hao Tian rode her bicycle back and forth, really just to watch a free open-air movie in Mei Cao?

Watching movies is one thing, maybe she wants to see men more.

The initial value of Xia Lu and Tang Wan's first love was 8888 points, and in nearly a year, the valuation of this relationship rose by nearly 200 points, and all the increments came from Xia Lu.

What does this mean?

First, Tang Wan did not completely forget Xia Lu, otherwise according to the two-way setting rules, Tang Wan's name would disappear from the system.

Second, remembering someone and falling in love with someone are two different things.

The first is good news for Xia Lu.

Second, it should not be good news.

If you like her, she must like you?

If she likes you, do you have to like her?

Unrequited love is decided by one person.

Two-way interaction, you have to agree to the other person.

How many heroes and heroes in ancient and modern times can't pass the level of love words.

Compared with love words, mathematics, physics and chemistry are much simpler.

Science at least has logic to follow, as long as the conditions are sufficient, the results can be accurately calculated.

I like her, she likes me, just put it on hold. Xia Lu concentrated on preparing for the exam.

In the dormitory, Zhang Kai flipped through a C language textbook and said, "I haven't had an exam for nearly four months, and I'm worried that I will hang up." ”

"This test doesn't take the computer, Zhang Kai, what are you doing studying the C language?" Qin Yibo asked, he had a mobile phone in his left and right hands, and operated two accounts to play games in a double row at the same time, with the left hand super god jungler and the right hand gold medal assist.

Zhang Kai shrugged and said: "Because there is nothing to study in mathematics, physics and chemistry, look at the C language to pass the time." ”

"So confident?" Du Shengyong put his hands on the ground and challenged the 100th push-up.

"I said that I was not confident, and I was worried that I would fail the exam. Zhang Kai is now learning and selling, writing programs on his own computer.

Xia Lu, who was studying calculus on the bed, punched the wall, boom!

The roommates looked at Xia Lu: "What a strong force!"

Xia Lu sat up and looked down at the three roommates under him: "You sluts, the exam is going to be tomorrow, don't you have to review the knowledge points that you may have to test? Have you considered the negative emotions I have because of you?

"This ......" The roommates were speechless and continued to play games, write programs, and do push-ups.

Whoa, whoa!

These three sluts!

In the first few days of school, one by one lewd development.

Now, it's awesome out of the god costume, right?

Xia Lu was very angry, Xia Lu jumped out of bed, pressed the three roommates to the floor and beat them violently, one dead and two disabled.

It's impossible.

It's just a dream, a dream of rage.

The next day, the written test for the freshmen of the science experimental class of Hongyi Academy arrived as scheduled.

The four people in Xia Lu's dormitory were divided into the same classroom, waiting for the exam papers to be distributed.

The invigilator said: "I emphasize again, the test is a routine of our Hongyi Academy, and the score of the test may have a little impact on your class, but it will not affect the fundamental problem, unless you hand in a blank paper." For students who hand in blank papers, we usually think that it is a problem of mentality, not a problem of strength. So take it easy, it's just a very ordinary test. ”

What the teacher said was an understatement, but Xia Lu worked hard to get a high score.

The paper was sent out, with a total of four questions, one each for mathematics, physics, chemistry and biology, 36 points for mathematics, 24 points for physics, 22 points for chemistry, and 18 points for biology.

Why does mathematics have the highest percentage?

Because the math is awesome.

Xia Lu first looked at the math problem with the highest score, what kind of problem is this?

Look at the physics problem again, what kind of problem is this? The head continues to blow up!

Fortunately, chemistry and biology are relatively simple, and Xia Lu finished the chemistry and biology questions first.

Looking back at the physics questions again, Xia Lu pondered, I think chemistry and biology are simple, my roommates, my classmates, they will definitely be able to get all 40 points in chemistry + biology.

The problem is that 40 points is definitely not enough, I want to enter the Hony Science class to study physics and chemistry and biology, and I must get a full score in physics + chemistry + biology.

This physics problem assumes that countries must comply with the following regulations when launching satellites: "After the satellite enters orbit, it is not allowed to leave the airspace corresponding to its territory and territorial waters, that is, the connection between the satellite and the center of the earth and the intersection of the earth's surface must fall on its territory and territorial waters." The orbital radius of the geostationary satellite is R0=4.21×10^4km. ”

There are no pictures, satellites, orbits, earth, space, territory, territorial waters and airspace, etc., which are made up by the students' brains.

Q: "A country that does not have equatorial airspace has decided to launch a powered satellite, which is located over a city at 40 degrees north latitude, and the distance between the satellite and the center of the earth is exactly R0. The mass of the unmanned rocket is 1.0×10^3kg, the fuel is 9.0×10^3kg, the main mass of the satellite is 100kg, and the jet speed of the rocket is 5km/s. ”

This question is difficult, this is several grades more difficult than the college entrance examination physics, this question belongs to the competition level, right?

Xia Lu rubbed his temples, he had not participated in any discipline competitions, and he had 0 competition experience.

This question Rory talked about a bunch of settings, and finally asked the students to find T.

Everyone knows that the lower the latitude and the closer to the equatorial launch site, the more conducive it is to the launch of rocket satellites.

Why does this question emphasize that "a country without equatorial airspace decides to launch a satellite", the teacher must have useful intentions!

So, I see, hiahiahia...... Xia Lu suddenly woke up to the fact that nearly a month of self-study was still effective, combined with strong brain value, there were ideas, there were ideas.

The satellite moves in a circle with an angular velocity of ω0 at an angular velocity of ω0 at an angular velocity of ψ=40 degrees latitude, hiahiahia......

Therefore, the required centripetal force can be obtained as F heart = mω0^2R0cosψ, hiahiahia......

Let the velocity of the rocket jet be u, and the mass of the satellite at t=0 is m0, hiahiahia...... Here you need to accumulate a point, and the integration obtains (m0^2R0/usinψ)t=lnm0/me......

Xia Lu became more and more comfortable, and his thinking became clearer and clearer, and finally he obtained t=21.5h.

What does this mean?

If a country has territorial territorial waters and airspace in the equatorial region, it is very advantageous to launch rockets with the help of a large linear velocity close to the equator, as well as the centrifugal phenomenon caused by inertia. If the rocket is launched in the area of 40 degrees north latitude, in fact, there is no big problem, it is nothing more than the consumption of more rocket fuel.

I see, I see, physics is still very interesting...... Xia Lu rubbed his hands together, ready to challenge his most scummy subject--- mathematics.