LIGHTNOVELONLINE Chapter 91
Chapter 91 Who the **** is
Z=4
Z represents the nuclear charge of a certain element.
Which element in the periodic table has a nuclear charge of 4?
Hydrogen Helium Lithium Beryllium Boron, Carbon Nitride Oxide Fluorine Ne…
It is obvious that the nuclear charge of beryllium is 4.
This question explains a phenomenon through a bunch of symbols, mathematical operations and physical principles, that is, Be2+ ions are trapped during the recombination process of gas discharge.
After a series of derivation and calculation, Shen Qi finally gave the answer: Z=4, which is beryllium.
From the macroscopic mirage to the microscopic ion trapping, most of the phenomena in the world can be explained by mathematical and physical methods. This is the beauty of science, and this is the power of science.
Of course, there are also supernatural phenomena that human scientists cannot explain. These problems are left to non-humans above level 15 to solve.
It took Shen Qi 1 hour to complete the first two questions.
The first two questions do have a certain degree of difficulty.
This rematch test paper is also naughty. The first two questions are difficult, but the latter one is not too difficult.
20 points for the third question, 24 points for the fourth question, 20 points for the fifth question, 22 points for the sixth question, and 20 points for the seventh question.
Shen Qi used another hour to finish the five calculation questions in the middle.
At this time, two hours passed, and Shen Qi completed seven of the eight questions on the theory test of the rematch.
The last calculation question has a score of 26 points, which is the highest in the whole volume.
“Fuck it?” Shen Qi tried the question three times, “The big axis question is so simple? Give points? Or do you pretend to give points to die?”
The stem of the last question is:
“Suppose there are 4/5 nitrogen molecules and 1/5 oxygen molecules in the air.”
“The temperature near the ground is 27°C and the pressure is 1atm.”
“There is a spherical artificial satellite with a cross-sectional area of 1 square meter at a height of 10km above the ground, moving around the earth at an initial velocity.”
“If there is no atmospheric resistance, the initial velocity of the satellite can just make it orbit the earth in a circular orbit.”
“However, atmospheric resistance exists.”
“Try to find the atmospheric resistance.”
Shen Qi reviewed the question three times and then reviewed it three times.
Ha ha.
slag.
Don’t think you are wearing a 26-point noble and gorgeous coat, I dare not mess with you.
Shen Qi can finally determine that the big axis question with the highest score is just a paper tiger.
Satellites are released, which is a physical phenomenon that combines mechanics and heat.
Because the atmosphere rises slowly, it can be treated as the troposphere for static treatment, where there is a differential relationship in which the pressure formed by atmospheric gravity decreases with height.
The ratio of nitrogen molecules to oxygen molecules set in the title came in handy.
As the altitude increases, the atmosphere does adiabatic pressure reduction and expansion, and the equation of temperature and pressure can be obtained.
With the help of mechanics, it is not difficult to estimate the initial velocity of satellite motion, which is close to the first cosmic velocity of 7.92km/s.
The collision between the satellite and the atmospheric molecules can be approximated as an elastic collision between the circular cross-sections of the satellite perpendicular to the flight direction of the atmospheric molecules.
Therefore, Shen Qi quickly calculated the result that the atmospheric resistance suffered by the satellite is:
F=5.5×10^7N
The eight questions in the semi-final theoretical examination involve optics, quantum theory, electricity, electromagnetics, mechanics, acoustics, preliminary astrophysics, and heat. The teacher who wrote the questions described the world of mortals through the test papers.
“The teacher who gave the test regards himself as God.” Shen Qi checked the test paper again, and then checked it again.
Although there are still 30 minutes, Shen Qi is not in a hurry to hand in the papers, check, and continue to check, and it takes three hours to answer the questions.
“This will fail 160, how can I face my ancestor Shen Gong?”
160 is the perfect score of the semi-final theory test paper. Shen Qi put out his full effort to respond to this test paper, aiming to score 160.
After the game, Mu Rong gathered 13 players who participated in the rematch to understand the situation.
“It’s difficult!” Bai Lingye shouted for my life to stop.
“It’s difficult.” Lin Xingyu looked solemn.
“There is a certain degree of difficulty.” Shen Qi said truthfully.
“Shen Qi, you didn’t hand in the paper in advance this time.” Mu Rong felt that the situation was not optimistic.
“The first two questions are indeed a bit complicated.” Shen Qi said.
“Hey, I didn’t write the fill-in-the-blank question, and I can’t deduce the trajectory equation. This question obviously touched the blind spot of my knowledge. The quantum theory of the second question is more abnormal, and I wrote it blindly. The satellite question of the last question is calculating atmospheric resistance. , I clearly have the impression that I was stunned as soon as I took the exam, and I was just a salty fish that didn’t work well.” Bai Lingye said bitterly.
“Actually, what Teacher Mu said is that we didn’t learn well.” Lin Xingyu looked for problems from himself.
“For the 160-point theoretical test, I may not get 80 points. Forget it, I don’t need to take the experimental questions, and the test is useless.” Bai Lingye said sullenly, advancing to the national finals and winning the national award. , Entered the Yan University physics experiment class, and was finally left behind by Yan University… This is too difficult to do. Bai Lingye is also considered a primary school master in their class. In the CPhO semi-final stage, which is similar to the provincial exam, he feels like There is no difference between a scumbag.
“Remember my classmates, never give up hope!” As a leader, Mu Rong must be optimistic, although she is a little pessimistic in her heart.
Nearly a thousand contestants across the province participated in the semi-finals. According to the practice of Southern Guangdong Province, no more than ten people were selected to represent the province to participate in the national finals. Because the experimental questions have not yet been tested, Shen Qi does not dare to guarantee 100% of his ability. When entering the country, he comforted the two juniors: “Lin Xingyu, Bai Lingye, you are only in the second year of high school, and you still have a chance next year. Teacher Mu is right, never give up hope, even this year, don’t give up hope or report hope. Talents are salted fish, UU reading www.uukanshu.com, at least we can do a good job on the experimental questions.”
“Hmm!” Lin Xingyu nodded heavily, and he stubbornly let himself hold on to a glimmer of hope and not let go.
“Okay, everyone has worked hard, go back and have a good rest, adjust the state, and disband.” Mu Rong issued a dissolution order, and everyone went back to each house.
94% of the players in the preliminary round were eliminated, and the number of remaining players dropped sharply. The work of scoring theoretical papers for the CPhO rematch was progressing very quickly.
One day later, each semi-finalist will be able to self-check the results of the semi-final theory test on the Chinese Physics Competition website.
Shen Qi uses his mobile phone to check the score, but he feels a little worried.
Enter the test number and click “Query”.
Mobile phone checking system shows:
Name: Shen Qi
School: Nangang No. 2 Middle School
Examination number: 10201XXX
CPhO rematch theory test score: 159
After seeing the score of 159, Shen Qi was shocked: “Who…who is embarrassing me? What is the deduction of a step point for me?”
This kind of thing, if you don’t taste it, you will become addicted once you taste it, just like smoking a crow pian.
CPhO preliminary rounds and semi-finals even got two “full points minus one point”. No one can accept this cruel reality.
“In this way, even if I get a perfect score of 40 points in the experiment, the total score in the semi-finals is at most 199 points. I…I might not be able to make the national finals.” Shen Qi felt the pressure.
“Brother, this is the thinking of studying god, oh no no, thinking of studying god. The test of studying **** is ninety-nine, and the **** studying has a long-term full score. However, there are a few more studying gods in the province, and the theory test is 159 points very high. Do you think everyone can get full marks in the test?” Lin Xingyu scored 130 points in the theory test. He was quite satisfied and exceeded his estimate.