In this secret hut where thousands of people have disappeared and the birds of the Tianshan Mountains have flown away, Tang Helu naturally has to do something that is extremely shameful that God knows you know and I know. This is the fourth goddess that Tang has collected in this great era. What he didn't know was that Lu was going to take advantage of Don's favorite time for her to gather information for her beloved British Empire.

She took advantage of Tang's lowest defense value to ask a question: "Everyone says that you are the most powerful man in the world, so, I want to ask, what do you think is the most powerful weapon?" ”

Don stared at the cheerfully jumping flames, feeling warm, of course, even warmer was Louise's smooth body, and in the infinite satisfaction, he casually said: "Satellite, is the second most powerful weapon." ”

This statement is very interesting, and Louise is not in a hurry to ask what the first power is, because she has not even figured out the second power: "Where is the power?" ”

Tang: "Now I have launched 700 satellites, including positioning, communications, meteorology, and remote sensing. Among them, the global positioning accuracy reaches 10 meters, and it is combined with wireless communication to make the cannon work together perfectly.

It was in this way that I blocked the entire South American hostile country with automatic artillery on the highways. And...... Maybe you already know the heroic martyrdom of the former prime minister of the Great Qing Dynasty, right? That is the masterpiece of precision-guided missiles used in satellite launch technology.

One missile can destroy a range of 140 meters in diameter, assuming that now there are 10,000 enemy soldiers in a few kilometers, and my guard has only a dozen people, guess which side will win? The enemy was supposed to win, but if they had stood too closely, they would have been killed by a single missile. Isn't it awesome? ”

Louise: "Your missiles can hit here at any time?" ”

Downing: "There's a launch center in Seattle, and the maximum strike distance is 1,000 kilometers, and you can hit here. ”

Louise hugged him suddenly, shuddered, and said, "I seem to feel insecure...... I thought I was the safest in Canada. ”

Downing: "...... Don't worry, I'll never fire a missile at your city, I swear. ”

Louise: "Hmm...... But it's still not good enough if you're not by my side when you're there? You don't know where I am. ”

Downing: "...... Actually, I know. As long as you continue to use the Internet, in which city you access, I will whitelist it, and even if the two countries go to war, you will be safe. Now, of course, I promise you that you won't deal with it, so you're very, very safe, don't think about it, my dear little Louise......"

Louise leaned against his chest and said softly, "You know what? Ever since the day I saw that little steelmaking model at your house with my mother and father, I've loved Uncle Downing. ”

Tang Ning was surprised: "Do you remember that...... You were only four years old then! ”

Louise: "Giggles, there's a four-year-old lover, sorry, right?" Also, when you gave me a stroller, I was so happy that I will always remember that moment. Later, because of Uncle Downing, I thought science was very magical, and I worked hard when I was in school, and I even learned calculus, right? ”

Tang Ning smiled: "That's really powerful, if you understand it." ”

Louise wriggled her delicate body to protest his discrimination against Bishoujo science lovers.

Just when Downing was dying of sweetness, Louise asked quietly, "Then, why can you launch a satellite into such a high orbit?" Scientists I know say they don't know how this works. ”

Tang Ning seems to have explained the principle of solid-state rockets without defense, laser propulsion is saved, too complicated, in fact, if you don't consider the cost, solid-state rockets are enough, and the main purpose of using laser propulsion is to save money, otherwise each of the 700 satellites currently launched will cost 100,000 euros, and the total cost will reach 70 million euros.

After using laser propulsion, the fuel cost is reduced by half, the material cost is reduced by half, the payload is increased by several times, and the total cost is only one-tenth of that of a pure rocket.

As a potentially hostile relationship, Downing was able to fully trust himself, and Louise was very touched and hugged him tighter, but she still had to ask, "So, what about the weapon of the first place?" ”

Downing: "First place...... This weapon is the real devil, and I hope that I will never see the day in my life when anyone will use it, including myself. No magical imagination can imagine its existence. ”

Originally, this sentence meant to tell Louise not to ask again, but ...... Instead, it aroused her endless curiosity, and she stared at him with beautiful seductive eyes, and said softly, "Is it so terrible? What the hell is it? ”

After being silent for a long time, and after countless thoughts turned in his mind, Tang Ning finally said, "Do you remember the formula of kinetic energy?" ”

is worthy of being a beautiful girl who was enlightened by science at the age of four, she actually remembered some physics after she got married, and thought about it: "kinetic energy = 0." 5 * mass * speed squared. ”

Downing praised, got up and dressed, and talked about science without shame and shame, sorry Socrates, Galileo, Newton......

Louise, who had a good heart, also got dressed and wanted to listen to the lecture seriously.

They came to the table where the firewood girl came out of the zuò to start the academic exchange, and Mr. Tang said, "The story starts with our measurement of the speed of light. As we all know, the earth rotates very fast, the earth revolves around the sun very fast, and the sun itself is only one of the billion stars in the galaxy, and it is in the Orion cantilever of the Milky Way, the edge of the galaxy, and the more the edge of the star, the faster the rotation of the star.

Therefore, our earth is moving at a high speed all the time. Until the speed of light is constantly measured, no scientist would have predicted that the speed of light would be the same in all directions. The problem arises, the surface of the Earth itself is moving at such a high speed that, according to the reasoning of Newton's inertial frame of reference, the speed of light in different directions cannot be the same.

So what's the problem? Since the velocity is constant, it can only be the mass and duration of the object, look at this equation......"

Mr. Tang wrote out the formula that the mass increases with the increase of speed, which is the result of the derivation of the special theory of relativity, and the derivation process is very complicated, but the resulting formula is only a middle school student can understand, and the most complex mathematical symbol is only a square root.

For the sake of intuition, Downing also drew the mass change function as an upward parabola, which can clearly be seen that when the speed reaches more than 60% of the speed of light, the mass doubles, and when the speed of light reaches 90%, the mass increases to 4 times, and then changes faster and faster.

"It's amazing." Louise at least understood the mass-increasing parabola.

Next is the difficulty, how to bring the change of mass to the change of kinetic energy, which is a calculus that requires calculus knowledge, Mr. Tang needs to help Louise review calculus while calculating, and finally come up with a formula like this:

The energy is approximately equal to: mass * the square of the speed of light + (0. 5 * mass * speed squared)

Teacher Tang: "We can think backwards, the loss of motion is the loss of energy, and at the same time, with the loss of mass, the motion is getting slower and slower, when the speed is zero, the mass can never be completely lost, and the energy is exactly equal to the square of the mass * the speed of light."

There is no velocity at this time, what is the so-called energy? Therefore, we can guess that the energy of an object with zero velocity is firmly locked in the mass, and once all the energy in the mass is released, a huge amount of energy can be obtained, and the conversion formula is e=mc2. ”

In other words, Louise can really understand the calculus derivation process, so she is still immersed in gorgeous deductions at the moment. The four princesses who were naturally stupid slammed into a spirit, and after replacing the movement of a few meters per second with the speed of light, they got super energy that could scare people to death.

She finally understood what Master Tang was talking about now, and she exclaimed, "Does this mean that all masses contain energy multiplied by the square of the speed of light?" ”

Master Tang smiled and nodded: "That's it!" The so-called weapon is an instantaneous explosion of energy, so once there is a way to unlock the huge energy that is sealed in the mass, it is the most terrifying weapon, and the country is overwhelmed. ”

Louise: "This ...... Can you unlock it? ”

Master Tang: "Yes." So, beloved, never be my enemy. Ahem, that's all I have to say, I'm not going to tell anyone about the way to unlock it, my wish is to sleep with this secret......"

Although the god-level scientists had convinced her 50%, there seemed to be a little problem, and Louise reviewed the whole deduction and found that the biggest problem was how the equation for mass with velocity was obtained.

That's the special theory of relativity. For the next seven days and seven nights, Louise was obsessed with the idea of deducing the formula of mass that could be increased or decreased. Originally, she only planned to secretly go on a short date with Master Tang, and she wouldn't even spend the night in the cabin, but she was already fascinated by the special theory of relativity under the halo of the world's number one weapon, and she really couldn't extricate herself, and even forgot to avoid suspicion.

In the past seven days and seven nights, most of them have been discussing the derivation of the special theory of relativity, and they have only a little time to love.

Louise hugged Master Tang to sleep as if she were holding the truth, sometimes waking him up at inappropriate times and asking him about physics, until Master Tang explained everything in a language that an amateur science enthusiast could understand, and she fell asleep again with an unprecedented sense of satisfaction in her arms and pillows of truth