1. Let m be the mass of the earth, m be the mass of the aircraft moving around the earth in a uniform circular motion, v be the velocity of the aircraft, and R be the distance from the aircraft to the center of the earth. The centripetal force required for the motion of the aircraft is provided by gravity, so: MV ^ 2 / r = GMM / R. From this, we can find that: v = GM / R under root sign. The near ground satellite flying at an altitude of 100-200 km, compared with the earth radius of 6400 km, can be said to be flying "near the ground". The radius of the earth R can be used to represent the distance between the satellite and the earth R, and the data can be substituted into the above formula. Finally, v = 7.9 km / S is calculated, which is also called the first cosmic velocity.
2. What is the sacred meaning of "Du universe"? What changes will it bring to our lives
according to the answers given on the official website, we can learn that the universe is more like a game. By virtue of the concept of the universe, the Internet has formed a magical world, which is composed of various rare elements. In the "universe", everyone has his own small planet. Each user starts his own journey from his own planet through wormhole. When traveling, users will meet all kinds of planets, and each planet is allowed to be explored. On these planets, users may have unexpected gains
the concept of "universe" seems to be a bit abstract and has a sense of technology. It seems that this is also the trend of future games. In this digital universe constructed by elements, gravitation and planets, users can expand their own planets with the so-called "elements". The larger the mass of the planet, the higher the level, and correspondingly get many new functions. In this one, also applied to the knowledge of the universe and physics, so that the whole game has a sense of science fiction, eye-catching
when it comes to blockchain, many people will immediately think of bitcoin, a kind of digital currency. This kind of virtual currency can finally circulate like real currency, and it is very popular all over the world
so let's briefly introce blockchain. Blockchain is a kind of chain data structure that combines data blocks in order according to the time sequence, and it can't be tampered and forged by cryptography. Blockchain is also an important concept of bitcoin. In essence, it is a decentralized database
but the "universe" of network development is different from bitcoin. It is not a digital currency, but a game activity that everyone can participate in, which is equivalent to a digital society. The goal of the network is to let everyone find themselves in a network universe
the physical meanings of planet gravity, mass of aggregation elements and planet mass are all reflected in the game, but they don't give people a headache. They use a simpler way to let users participate in it. The more the mass of the planet, the more mysterious functions will be opened. In this way, all users will be motivated to move forward
at present, the proct of "Du universe" has not yet taken shape, but has a basic concept. On the first day of the release of "Du universe" procts, the official network will "air drop" 100 elements. Many friends who are interested in this game can't wait
in fact, it's not the first time that the network involves the blockchain, and the recent application "oasis" implemented by the network is one of them. So what is oasis? In fact, "oasis" is also a game, but the concept is different from "universe". Oasis uses "crystal" and "calculation power" as the currency of the game. The higher the calculation power, the faster the crystal will be generated
the network has made great efforts in the field of blockchain. It can be seen that the network wants to focus on cultivating itself in the field of blockchain, but not every successful innovation can succeed. We are confused about "universe" and have expectations
I hope this answer will help you
3. The first cosmic velocity refers to the speed at which an object moves around the earth in a uniform circular motion near the ground, which is called the first cosmic velocity
the first cosmic velocity
gives GM = v r, R earth = 6.375 × 106m, M = 5.965 × 10 ^ 24kg, the gravitational constant is 6.67259 × 10 ^ - 11 m ^ 3 / (kg · s ^ 2) and square, V ≈ 7.9 km / s
the second cosmic velocity v2. When the spacecraft exceeds the first cosmic speed V1 to a certain value, it will break away from the earth's gravitational field and become an artificial planet around the sun. This speed is called the second cosmic speed, also known as the breakaway speed. According to the theory of mechanics, the second cosmic velocity V2 = 11.2km/s can be calculated. Since the moon is not beyond the range of the earth's gravity, the initial speed of a lunar exploration spacecraft launched from the ground is not less than 10.848 km / s
the third cosmic velocity v3. The minimum speed required to launch a spacecraft from the earth's surface, fly out of the solar system, and roam the vast galaxy is called the third universe speed, also known as escape speed. According to the theory of mechanics, we can calculate the velocity of the third universe V3 = 16.7 km / s. It should be noted that this is the V3 value calculated when the spacecraft's orbital velocity is consistent with the earth's revolution velocity; If the directions are not consistent, the required speed will be greater than 16.7 km / s. It can be said that the speed of spacecraft is the only factor to break away from the gravity of the earth and even the sun
Fourth cosmic velocity
it is estimated that when an object has a velocity of 110-120km / s, it can leave the galaxy and enter the extragalactic galaxy, which is called the fourth cosmic velocity
the velocity of the fifth universe is the minimum velocity of the spacecraft flying out of the local galaxy group when it is launched from the earth. Because the radius and mass of the local galaxy group do not have enough accurate data, it is impossible to estimate the size of the data. At present, scientists estimate that there are about 5-10 billion light years. According to this calculation, it should take 1500-2250 km / s to fly away
4. First, the velocity of the universe is the velocity of an object moving around the earth in a uniform circular motion near the ground, so the required centripetal velocity is MV & #/ R=GMm/R²
because there is "mg ≈ GMM / R & # 178" on the surface of the earth Therefore, the calculation of the first cosmic velocity should use "MV & # 178/ However, in the accurate calculation, "MV & # 178" is directly used/ R=GMm/R²”, It's just like in the second compulsory physics textbook
5. In essence, our perception of the world is all the result of our brain's processing of various bioelectrical signals. For example, when our eyes receive the visible light from an object, the visual system will generate specific bioelectrical signals, which will then be transmitted to the relevant areas of the brain through the nervous system, After processing by the brain, we see the object
such a strange phenomenon, even Einstein could not give a perfect explanation, so he could only describe it as & lt; Ghostly over distance effect & quot;. However, if the universe is really a set of computer programs, then this phenomenon can be used; The program refers to two pointers to the same object; To make a simple explanation
imagine that the macro world is built on the micro quantum world. Since the above four phenomena of the quantum world strongly indicate the existence of computer programs, the macro world we live in is not so real. Because of this, many people doubt the authenticity of the universe, The universe is likely to be a set of computer programs
it should be pointed out that among the people who support this view, there are also some famous people in the scientific community, such as Elon Musk, CEO of SpaceX, Neil degrasse Tyson, a famous astrophysicist, and so on. Therefore, it can be said that if one day we find that the universe is really virtual, we need not be too surprised
6. The minimum launching speed of a satellite means that the satellite was originally stationary on the ground and accelerated by the rocket until it gained a speed. After that, the satellite is no longer propelled by the rocket, and only moves around the earth in a uniform circular motion under the action of the earth's gravity, The mechanical energy when entering the circular orbit is the sum of kinetic energy and gravitational potential energy. Let e = E [k] + e (P) = - GMM / 2R (here, the gravitational potential energy at infinity is zero). From this formula, it can be seen that if you want to become a satellite rotating around the earth, the smaller the launching speed is, the smaller the mechanical energy when entering the circular orbit is. When r = R (R is the radius of the earth, R is the radius of the satellite orbit), the mechanical energy is the minimum, In other words, only corresponding to r = R, the energy consumption of the rocket can be minimized. Therefore, the minimum launch speed v [1] of the satellite entering the earth satellite orbit conforms to GMM / R ^ 2 = MV [1] ^ 2 / r = = & gt; v[1]=sqrt(GM/R); According to the gravity acceleration of the earth surface, g = GM / R ^ 2 = = & gt; v[1]=sqrt(gR)
7. Since its birth, Huawei's P-Series mobile phones have taken lightweight fashion design and innovative imaging technology as their core DNA. From P9 Leica al lens and P10 portrait photography to P20 pro's 40 million Leica three photography, Huawei has been constantly innovating and exploring. Each generation of procts can provide consumers with different professional photography experience. The new generation of super photography mobile phone Huawei P30 series is brilliant in the world. With its many revolutionary technological breakthroughs, it rewrites the basic rules of digital photography image technology for more than 40 years. It not only makes Huawei P30 series an epoch-making flagship with outstanding strength, but also makes mobile image reach a new height unprecedented before. At the same time, Kirin 980 chip has powerful
computing power to help you take wonderful photos and videos, so that every owner can obtain professional image experience, find the fun of shooting and discover more beautiful world. Yu Chengdong, CEO of Huawei's consumer business, said: "Huawei P30 series leads the future of photography and rewrites the rules of photography. With the innovation of image technology such as super sensitive lens, periscope telephoto lens, ultra wide angle lens and TOF lens, the P30 series can fully compete with professional cameras in the photographic experience. The new experience and inner feelings brought by P30 series to users are, in a word, the ultimate image and a better world. In the hands, eyes and hearts of P30 series users, the world is beautiful. The ultimate experience of P30 series imaging technology makes every moment of life more beautiful. Good procts speak. From all the proct languages of P30 series super video mobile phones, we can see that creating a better world and making the world a better place are not only Huawei's technical concept and proct orientation, but also Huawei's caring responsibility, corporate belief and mission for global users. " Technology and art resonate, creating a new realm of aesthetics. Huawei P30 series talks to the soul with aesthetic design, bid farewell to the cold machine texture, draw inspiration from the mysterious and dreamy Salt Lake, and engrave the tranquility and elegance of "sky realm" on the back of the fuselage. The brand-new red tea orange, sky realm, pearl Fritillaria, bright black, Aurora and other color changes can keep the circulation of time and space between the thin square inch, making the delicate life more colorful. Among them, Skyland adopts a new gradient design, which is processed by 15 layers of technology. Only the graal plating section contains 9 layers of nano optical film, just to let you hold the most beautiful moment in your hand. Huawei P30 series adopts a new generation of Pearl screen, with ultra small bangs and ultra narrow borders. The screen almost extends to the front of the whole mobile phone, making it more immersive when browsing videos and playing games. Clever thinking is also hidden under the screen. P30 series is integrated into the on-screen fingerprint identification system, which can be unlocked and paid with a touch. P30 Pro also supports the technology of magnetic suspension sound screen to eliminate the opening of earpiece, making the front as pure as jade. The front and back curved surface glass is wrapped in the light and graceful fuselage, which makes the grip feel smooth and round, comfortable and powerful. The super sensitive Leica four camera system on Huawei P30 Pro has professional sensitivity and zoom ability. Four lens combinations are 40 megapixel super sensitive lens, 20 megapixel ultra wide angle lens, 8 megapixel periscope telephoto lens and one TOF lens. The new generation of Leica four camera works with image signal processor (ISP) and neural network unit (NPU) to take more brilliant photos and videos intelligently and conveniently. Super sensitive lens, equipped with super sensitive sensor and new color filter array design, integrates more light into the pixel, rewrites the 40 million pixel structure, and makes Huawei P30 Pro realize the unprecedented super sensitive dark shot, straight out of the night scene blockbuster. The revolutionary ryy B ultrasonic sensor replaces the green pixels in the traditional rggb sensor with yellow pixels, changes the photosensitive rules of traditional digital photography for more than 40 years, and increases the light input by 40%. With the help of independent ISP and super sensitive AI image engine, with customized OIS motor and F / 1.6 aperture, the maximum sensitivity can reach 409600. Even in the light of the moment when the wick goes out, it can also take a shocking image. Huawei P30 Pro also breaks through the shackles of zoom: the periscope telephoto lens is horizontally placed in the slim fuselage, supporting 5x optical zoom, 10x hybrid zoom and up to 50x digital zoom. At the same time, with optical anti shake, you can experience the professional zoom function without the help of auxiliary equipment, so that the beauty in the distance is close at hand, you can easily take a clear picture of the moon, and send the clear moonlight to your eyes. At the same time, the spectacular scenery of animal migration on the East African prairie can be instantly frozen with a mobile phone without the lens of "long gun and short gun". In addition, Huawei P30 Pro also brings other professional photography experience. TOF lens can achieve high-precision hair matting, bring more excellent sense of hierarchy and artistic expression. Based on TOF lens to capture accurate depth of field information, progressive virtual effect from near to far can be achieved. The ultra wide angle lens can accommodate ultra wide angle and macro field of vision, 20 million pixels + 2.5cm, the nearest focusing distance, whether it's a big group photo or the micro beauty of a tiny finish, all in one lens. The front-end 32 megapixel camera can intelligently enhance the dark backlight vision, just like a professional light maker, showing a more quality three-dimensional sense. As a director of life, moving the wonderful moment into the video, Huawei P30 series also has excellent video shooting ability. No matter the distance, light and shade changes, it can present cinema level image quality, everything is ready, just waiting for you to turn on. Super sensitive lens provides excellent sensitivity and dynamic range. It can capture the flow of light and shadow in the night show. The neon, bright moon and starry sky in the city can be vividly recorded. The periscope telephoto lens avoids the loss of image quality to the greatest extent, and meets the quality requirements of users for long-range shooting. Professional anti shake performance, even if the bumpy road, intense movement can also take a stable image. Huawei P30 series also brings refreshing shooting methods and fun. Dual view video makes panorama and close-up appear at the same time: one screen has two views, which can not only view the vast overall situation, but also obtain zoom close-up. With the help of powerful AI computing power, Huawei P30 series is still a mobile image studio: AI video editing has a unique aesthetic scoring engine, which can intelligently edit and render videos, making the original insipid videos relaxed, beautiful and fast to share. Huawei P30 series won 112 points from DxOMark, a professional camera evaluation organization, which once again confirmed Huawei's innovative strength in leading the mobile imaging revolution. The Huawei P30 series is equipped with 7Nm Kirin 980 chip, which makes it easier to run large-scale 3D games, split screen multitasking and video editing. A number of revolutionary hard core technologies accelerate the system, and the new erofs file system improves the running efficiency and data reading performance from the bottom of Android. GPU turbo 3.0 adds support for 70 domestic and foreign games. Huawei P30 series has enhanced wireless connection experience. Smart al card Internet enables you to stay online all the time without missing important information. The instry's fastest 1.7gbps WiFi download speed, as well as high-performance Bluetooth and high-precision al band GPS positioning, help you always move faster in the wireless era. 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In addition, Huawei launched Huawei P30 Pro Limited package, including a sky realm / Pearl fritillary phone (8GB + 512gb) and xiayingsha Star Diamond protective case (Cherry Blossom color); Xiayingsha · Star Diamond case mobile phone case covered with Swarovski_ Imitation crystal stone, like mobile phone covered with a layer of star drill tulle, you can see the graal change of mobile phone color. Huawei has also released ultra long enrance outdoor smart watches, Huawei watch GT dynamic and elegant, Huawei freelace wireless headset with hipair flash connection and fast charging technology, and Huawei X General master eyewear, which is jointly designed with fashion glasses brand general master. Huawei P30 series mobile phones will be launched in the global market from now on. The price of Huawei P30 is 799 euro (overseas version 6GB + 128GB); Huawei P30 Pro is 999 euro (8GB + 128GB), 1099 euro (8GB + 256gb), 1249 euro (8GB + 512gb). It is understood that the new procts of Huawei P30 series officially opened for pre-sale at 00:00 on March 27, Beijing time, and fully opened for sale at 18:08 on April 11.
8. GMM / R and 178 can be used to calculate the first velocity of the universe= mv²/ r. Mg = MV & # 178 can also be used/ r. The answer of the former is √ GM / R (GM / R is in the root sign), and the answer of the latter is √ GR, which can be replaced by gold, GM = R & # 178; G (R is the radius of the earth), when the two answers are the same, when the golden substitution can be used, or when the universal gravitation is equal to gravity, the rotation speed of M must be small, so the rotation speed is ignored
hope to adopt it!!!
9. 1第一宇宙速度即为星球表面圆周运动的速度，由牛顿第二定律可得：
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Publish: 2021-05-29 20:04:36
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