Ita Era

Chapter 114 Mathematics and Physics

The classroom door opened, and the world instantly became utterly silent and dark, as if transported to another time. Danger lurked in the darkness, ready to pounce and kill at any moment.

Before Ding Shi could make a move, the entire campus lit up, all the lights turned on. The twin evil spirits, while hunting their prey, also revealed their location.

Ding Shi spotted Gao Shao standing near the track and field at the first glance, and Gao Shao saw Ding Shi on the second floor of the teaching building at the same time. The two started moving together; Ding Shi quickly went downstairs and headed towards the faculty and staff building on the left side of the teaching building, while Gao Shao ran towards the teaching building.

When Gao Shao arrived at the stairwell of the teaching building, he lost track of Ding Shi. He looked to the left and then to the right. The right side was the track and field, the direction he had come from. Ding Shi could only have gone to the faculty and staff building on the left.

Ding Shiren was already in the mathematics group office on the second floor of the faculty building. It was an open-plan office with a separate workstation.

There is no isolation space this time. Blood message: Five questions. Answer all correctly to obtain fragments. Answer correctly within 3 minutes to obtain a special reward. A pen floats in front of the wall.

Question 1: Write out the formula for the difference of cubes.

What?! Seriously?!
Ding Shi immediately abandoned his thoughts, turned around and looked around. His desk was piled high with lesson plans, test papers, textbooks, and supplementary books...

Ding Shi plunged headlong into the ocean of knowledge.

Ding deduced that seventh graders should be learning the difference of squares, so they could be ruled out. Ninth graders wouldn't bother learning the difference of cubes. Therefore, there's only one answer: the difference of cubes is eighth-grade material.

So Ding Shi took the eighth-grade textbooks (both volumes), crawled under the desk, and began to read. He faced the office door, and his movements were very light, as if afraid of making too much noise.

Since it's impossible to answer all the questions correctly within 3 minutes, safety should be the top priority.

On page 20, Ding Shi found a clue in the second volume. Turning to page 20, he indeed found an introduction to the concept of cubic difference. Then, a pair of pale, bare feet appeared at the office door.

The feet remained in a forward-walking posture, but did not move, seemingly surveying the mathematics office.

Ding Shi could only pray: Even humans don't like learning math, how could a ghost like you understand it? Hurry up and leave.

He took a step forward, then stopped, walked into the office, and stared at the disheveled desk for a while. In his memory, this desk belonged to his math teacher, who was always stern and meticulous, and whose things were always neatly arranged.

Watching those feet slowly wander around the office area, Ding Shi felt as if a head would suddenly appear in front of him and smile: Got you?

Ding Shi drew his dagger and threw it out the door with the strength of his wrist. The dagger struck the wall at an angle and bounced off to hit the other side of the wall.

Those feet disappeared like the wind, chasing after the sound.

Ding Shi didn't leave immediately. He took out his Wildcat Crossbow, loaded the last bolt, and pulled the trigger. The bolt flew out of the gate, but due to the small angle, it couldn't penetrate the wall, and its trajectory became erratic. However, the powerful thrust propelled the bolt forward for more than twenty meters. Now, he gambled that the evil spirit hadn't seen the firing point, and also that the evil spirit wasn't very intelligent.

Ding Shi didn't dare to look at the results, so he couldn't be sure if the evil spirit was chasing the crossbow bolts. But he was certain that he had been exposed and that the evil spirit wouldn't leave easily before it had thoroughly searched the math office.

Ding Shi pushed open the window, threw out a chair, and hid behind the grandfather clock. The chair landed with a thud and rolled into the flowerbed below the steps.

Two seconds later, the evil spirit entered the math office, immediately went to the window to look outside, and jumped down without hesitation.

Ding Shi watched as the evil spirit leaped out of the window, then slipped out, picked up a pen, and wrote down the formula.

The second question asks: Please write the formula for the cosine function.

I'll throw your nuts at you!

Ding Shi immediately went to the ninth-grade office area, grabbed his textbooks (both volumes), and left. Why ninth grade? He at least remembered the difference of cubes, but what was a cosine function? Ding Shi had absolutely no recollection of it. Since that was the case, it must be ninth-grade material. The most unforgettable thing about ninth grade was that ponytail, not some cosine function.

Ding ran out the door, headed straight for the physics office, closed the open door, and rushed back to the math office, squeezing into the gap between the grandfather clock and the wall. This was a good spot; tilting to the left, he could see the doorway, and tilting to the right, he could see the window.

After finding the formula at Ding Shi, Gao Shao returned. He intended to continue searching in the math office, but then he spotted the closed door to the physics office. In his memory, that door was open. So he continued walking, opened the physics office door, and went inside.

Ding Shi suddenly appeared and wrote down the formula.

The third question is finally a question from Ding Shihui: the area of ​​a rectangle. Isn't it just the length multiplied by the width?
After writing the answer, the words appeared in blood: "Please use letters to represent it."

Damn it, this system is a piece of shit.

Fortunately, the concepts are interconnected. Ding Shi found the letters representing area and filled in the answer: S=ab. Seeing that the answer was correct, Ding Shi was particularly impressed with his own cleverness for not writing a×b.

Question 4, Question 5...

Swimming in the ocean of knowledge, Ding Shi forgot about time, space, and the evil spirit. When he obtained the sixth fragment, the evil spirit appeared at the office door, and their eyes met.

Ding Shi turned and strode onto the desk. The evil spirit chased after him and also climbed onto the desk, the two less than a meter apart. Ding Shi dashed and jumped out of the window, and the evil spirit jumped out of the window without hesitation.

Ding Shi grabbed the windowsill with both hands and swung outwards, while the evil spirit rushed outwards as well. Ding Shi exerted force with both hands, and swung back into the office.

The evil spirit landed and turned around to see Ding Shi swing back. Enraged, it clawed at the wall and climbed up. Ding Shi used his Force to swing a chair around and smash it down on the emerging evil spirit. The evil spirit blocked with its hands, and the chair shattered like paper. But without its hands for support, the evil spirit fell backward, and Ding Shi slapped it across the face.

The evil spirit landed, touched its cheek with its left hand, and remained stunned for a long time. Then it looked up at the sky, bared its teeth, and roared silently. It sprinted, using both hands and feet to climb the wall, and nimbly jumped into the math office, but the math office was already empty.

The enraged evil spirit slammed the door shut. No more hide-and-seek; it entered the physics office, grabbed a desk, and smashed it against the wall. Even destroying everything couldn't quell its raging fury.

The evil spirit kept having one question on its mind: How dare he do that?

Ding Shiren was on the rooftop of the faculty building, listening to the sounds of smashing below, tears welling up in his eyes. Who would have thought the seventh fragment was in the physics office? He should have framed the English office. Judging from the evil spirit's mood, it was unlikely to leave the faculty building during its period of isolated destruction.

Okay, let's give them some time to calm down.

With no lights on the rooftop, Ding Shi was happy to rest for a while. He stretched his body to relax his muscles, and then he saw Tie Zhenzhen climbing the wall. Tie Zhenzhen was perched on the wall like a sloth. According to the rules, half of Tie Zhenzhen's body was inside the ghost realm and half was outside of it, so she hadn't truly entered the ghost realm.

I must say, her idea was smarter than mine; from the top of the wall, you could see a large part of the campus. Climbing the wall would give you a 50% view of the campus. It was only 100 meters away!
Should he expose himself to warn them? Definitely not. Seeing the evil spirit smash the chair to pieces, Ding Shi knew his current Force power was nothing compared to it. But not warning them would be morally wrong.

After thinking for a while, Ding Shi took out his Wildcat Crossbow and searched the ground, finding a stone. He channeled his Force into his hand, took two steps forward, and threw the stone at Tie Zhenzhen.

The stone flew out at great speed, and you could even faintly hear the sound of it cutting through the air.

Tie Zhenzhen looked down and stretched out her foot to test the height. Suddenly, she sensed something, looked up, and saw a stone hurtling towards her, hitting her squarely in the left cheek. Stunned, Tie Zhenzhen was thrown off the wall by the impact, falling heavily to the ground from the three-meter-high wall.

Ding Shi was filled with mixed feelings of surprise and joy. He was surprised that he hadn't killed Tie Zhenzhen, could he? Theoretically, it shouldn't be possible. He had seen people in the Middle East throwing stones at women, and it usually took dozens of stones to kill a woman, let alone a woman from our great China.

Since the last dungeon, Ding Shi has realized the limited effectiveness of the Willow Leaf Throwing Knife; its main use is in conjunction with the Golden Thunder Talisman. Against increasingly stronger players and progressively more powerful dungeon enemies, the throwing knife's damage is extremely limited.

The good news is that Ding Shi discovered a new weapon. With that accuracy, who would believe it wasn't enhanced by training?

Ding Shi found the second stone, used his Force to break off its edge, and aimed for the 120-meter soccer goal. Then Ding Shi saw the short, evil spirit entering the soccer field. Ding Shi sprinted three steps and threw the stone. Based on the short, evil spirit's speed, Ding Shi threw it ahead of its target.

The stone hurtled towards them, but Ding Shi estimated it missed by about half a meter. Just as it was about to miss, the dwarf demon slapped it down, sending a puff of gray smoke flying as he pulverized the stone. The dwarf demon then looked towards the teaching building and faculty dormitory, searching for the attacker's location.

Ding Shi sat on the ground, trying to get a feel for it. He found it hard to believe that a human could throw so accurately without training. Soon, Ding Shi grasped the key point: when throwing stones, his eyes were always on the target, and he unconsciously channeled his Force into the stone. This Force was like a thread, connecting his eyes and brain at one end and his right hand at the other.

As a pure Force professional, Ding Shi had long ago experimented with using the Force to enhance his ears, nose, and eyes, but to no avail. For example, the sense of smell relies on the olfactory epithelium for sensing, which connects to the brain via neurons. The Force cannot increase the surface area of ​​the olfactory epithelium, nor can it cause any qualitative change in it.

The same applies to the eyes; they cannot see further, nor can they even improve Ding Shi's mild myopia.

Throwing a stone involves a system centered on the eye, connecting the brain and arm, triggered by the Force. Just as reaching for an object with the aid of the eye allows us to accurately grasp it, accuracy decreases with distance because the human brain's neural pathways cannot precisely calculate and control the arm. However, through long-term training, the human motor nerves can become more acute, resulting in a much higher accuracy rate than untrained individuals.

This is why some people are born sharpshooters.

Ding Shi wasn't a natural sharpshooter, but with the Force-assisted tools, he could temporarily become one when needed.

Whether it's right or wrong, Ding Shi's mind has already accepted this explanation.

……

The physical office was not just a mess, but a pile of rubble; almost nothing—desktops, chairs, equipment, books, and exam papers—was spared.

This time, the system was very considerate; not only did it only require answering five questions, but it also gave Ding Shi a complete set of brand-new junior high school physics textbooks. These textbooks were practically indispensable.

If you fail to answer the question, you can try again after half an hour.

Junior high school physics, isn't that child's play? Bring it on!

Question 1: Han Leilei imagines himself swimming in the air like a fish. What principle is this imaginative idea based on?
A: Inertia. B: Atmospheric pressure. C: Refraction of light. D: Fluid pressure and velocity.

A sense of powerlessness washed over him. After squatting for a minute, Ding Shi chose D because it was the longest answer. A checkmark appeared in blood. Ding Shi laughed, "I knew it! How hard could junior high physics be? You could guess right no matter what."

Question 2: An apple falls from a tree and suddenly gravity disappears. What will happen to the apple?

A: Slowly stop. B: Stop moving immediately. C: It will fall to the ground. D: It will move in a straight line at a constant speed.

Upon seeing this question, Ding immediately began brainstorming. He knew that A, B, and C all had six characters, while only D had seven. The previous question already had D. Knowing the nature of this system, he was sure this question was a trap, using answer D to lure himself away from choosing D, when in fact D was the correct answer.

Choose D when you are in the Dingshi school.

correct answer.

Haha! When life is over, the academic underachievers are here, and the academic geniuses can go to hell.

Question 3: Which superpower violates the law of conservation of energy?

A: Super hearing. B: Far-seeing eyes. C: Teleportation. D: An electric car that can run without charging.

Ding Shi's pupils contracted, and he carefully wrote down the answer D. This wasn't a guess, but rather based on basic knowledge. He intuitively felt that the system had set a trap. Currently, all three answers were D, and the answer with the most words was the correct one. This wasn't accidental, but deliberate.

What's the killer feature of the dog system? Is it question four? Or question five?
Question 4: If Earth's gravity is reduced by half, which of the following statements about the impact on ships on water is correct?
A: The ship's weight remains unchanged. B: The buoyancy force on the ship decreases. C: The volume of water displaced by the ship decreases. D: The ship's draft increases.

I'm coming.

解：
Given that C has the most words, and A, B, and D have the same number of words, we can analyze the answer based on the two definitions: the answer with the most words is correct, and D is also a correct answer.

The dog system has one more chance, and this assessment will definitely be conducted from a position of humiliation.

Solution: Assuming D is the correct answer, I would choose C. This result is not insulting enough, because choosing D is based on habitual thinking and a "what's the use" mentality. Assuming C is the correct answer, choosing D ignores the uniqueness of having the most characters, which, while not many, is still insulting.

Conclusion: Choose C.

The answer is correct.

You dog system, what do you have to fight me with?

Question 5: Which of the following can be explained by the rectilinear propagation of light?

A: Reflection in water. B: Pinhole imaging. C: Mirage. D: Rainbow after rain.

Ding Shi gasped. It was gone. There was no clear direction; it was all just four words: "Damn system, you can't afford to play this game."

(End of this chapter)