Using scientific counting method to express length unit conversion For example, 1m = 10 ^ 9nm, 1m = 10 ^ 2nm It's a thousand meters, decimeters, centimeters, millimeters, nanometers. These are converted by scientific counting method, just like the example above

1 km = 10 ^ 3 M 1 m = 10 ^ 1 decimeter 1 decimeter = 10 ^ 1 cm 1 cm = 10 ^ 1 mm 1 mm = 10 ^ 3 micron 1 micron = 10 ^ 3 nm 1 nm = 10 ^ 3 PIM 1 PIM = 10 ^ 3 Femi this is the total: 1 km = 10 ^ 3 M = 10 ^ 4 decimeter = 10 ^ 5 cm = 10 ^ 6 mm = 10 ^ 9 micron = 10 ^ 12 nm = 10 ^ 15 PIM = 10 ^ 18 Femi

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1. Conversion of physical units and scientific counting of final results 800cm²= = m² 15dm²= = cm² The 7th power of 3 × 10 mm & sup2; = = M & sup2; The fourth power of 5 × 10 is ml = = L 2.5m³= = = mL 30m/s= = km/h 0.09m/s= = cm/min
2. Isn't the diameter of the Milky Way 80000 light years? Or 100000 light years
3. It is known that the diameter of the Milky way is 80000 light-years. Now the fastest spacecraft of mankind is the space shuttle. Its speed is 8000 meters per second How many seconds does it take to fly from one end to the other?
4. The size of the sun is 1.3 million times that of the earth, the diameter of the earth is about 1 * 10 to the seventh power, and the width of the Milky way is about 100000 light-years The calculation shows that the band sample is only a tiny member of the galaxy
5. What is the distance between the sun and the center of the galaxy
6. How many light-years is the sun from the center of the galaxy?
7. When did humans fly out of the solar system When did humans fly out of the solar system ① It has been more than 40 years since the Soviet Union launched the first man-made satellite in 1975. During this period, human beings broke away from the earth's gravity, flew out of the global village, and landed on the moon. However, human beings always feel that the pace of flying is too slow, and always anxiously look forward to when they can fly out of the solar system, Entering the space age? The Space Angel "pioneer" and "traveler" probes released by human beings in the 1970s have been flying out of the solar system for 20 to 30 years, trudging 6 billion kilometers and flying over the farthest orbit of Pluto. But has it ever flown out of the solar system? ② In fact, the boundary of the solar system is very broad. If the solar wind is used to calculate the range, the radius can reach 13.5-18 billion kilometers; if the solar gravity is used to calculate the range, the radius can reach 15 trillion kilometers, about 1.5 light years. It can be seen that the above-mentioned flying probe is far from the boundary of the solar system, The solar system is just a drop in the ocean. It's easy to cross a small river. To cross the ocean, we must have sufficient conditions. At present, human's understanding of the universe and space technology are far from enough for aerospace, and they are far from meeting the requirements of flying out of the solar system ③ So "pioneer" and "Voyager" probes can only be regarded as "space flight" out of the earth's atmosphere, far from "space flight" out of the solar system ④ For the space flight out of the solar system, it's just a piece of white paper, At present, one of people's visions is to develop space power sources with small mass, long operation time and high energy, such as electric rocket, laser rocket, nuclear rocket, microwave powered spacecraft, laser powered spacecraft, antimatter propulsion starship, etc, Flying at the speed of hundreds of kilometers per second, thousands of kilometers, tens of thousands of kilometers or even close to the speed of light, people will be able to fly out of the solar system and make interstellar voyages to other stellar systems, the Milky way or distant galaxies in their lifetime ⑤ When we can fly out of the solar system depends on the development level of human intelligence and science and technology on earth. Work hard, maybe in decades or hundreds of years, the dream of human yearning for interstellar navigation will become a reality 1. What is the main content of this article? 2. What is the way to explain the sentences underlined in the third natural paragraph
8. At present, human sky detectors can fly as far away as? A. Earth Moon system B. solar system C. Galaxy D. total galaxy
9. When will man fly out of the solar system ① It has been more than 40 years since the Soviet Union launched the first man-made satellite in 1975. During this period, human beings broke away from the earth's gravity, flew out of the global village, and landed on the moon. However, human beings always feel that the pace of flying is too slow, and always anxiously look forward to when they can fly out of the solar system, Entering the space age? The Space Angel "pioneer" and "traveler" probes released by human beings in the 1970s have been flying out of the solar system for 20 to 30 years, trudging 6 billion kilometers and flying over the farthest orbit of Pluto. But has it ever flown out of the solar system? ② In fact, the boundary of the solar system is very broad. If the solar wind is used to calculate the range, the radius can reach 13.5-18 billion kilometers; if the solar gravity is used to calculate the range, the radius can reach 15 trillion kilometers, about 1.5 light years. It can be seen that the above-mentioned flying probe is far from the boundary of the solar system, The solar system is just a drop in the ocean. It's easy to cross a small river. To cross the ocean, we must have sufficient conditions. At present, human's understanding of the universe and space technology are far from enough for aerospace, and they are far from meeting the requirements of flying out of the solar system ③ So "pioneer" and "Voyager" probes can only be regarded as "space flight" out of the earth's atmosphere, far from "space flight" out of the solar system ④ For the space flight out of the solar system, it's just a piece of white paper, At present, one of people's visions is to develop space power sources with small mass, long operation time and high energy, such as electric rocket, laser rocket, nuclear rocket, microwave powered spacecraft, laser powered spacecraft, antimatter propulsion starship, etc, Flying at the speed of hundreds of kilometers per second, thousands of kilometers, tens of thousands of kilometers or even close to the speed of light, people will be able to fly out of the solar system and make interstellar voyages to other stellar systems, the Milky way or distant galaxies in their lifetime ⑤ When we can fly out of the solar system depends on the development level of human intelligence and science and technology on earth. Work hard, maybe in decades or hundreds of years, the dream of human yearning for interstellar navigation will become a reality 1. In what order is this article written? Extract the words that can reflect this order from the article. 2. In connection with the content of the full text, talk about the expression effect of the word "drop in the ocean" in the second paragraph. 3. What is the role of the third natural paragraph in the structure of the full text?
10. Conversion from km to NM
11. Unit conversion 1kg / m ^ 3=______ g/cm^3
12. It is expressed by scientific counting method: 0.0045m =? Um =? Nm, 1m =? Mm =? Um =? Nm It is expressed by scientific counting method: 1m =? Mm =? Um =? Nm 0.0045m=?um＝?nm, 1500000cm＝?km 78um＝?m
13. 3cm＝( )nm＝( )um＝( 3cm＝( )nm＝( )um＝( )
14. （1）25CM=（）UM=（）NM=（）KM （2）52MM=（）M=（）DM=（）NM （3）0·5DDM=（）M=（）UM=（）KM （4）900KM=（）MM=（）DM=（）CM (5) 40 cubic decimeter = () cubic meter = () cubic centimeter = () l (6) 100 cc = () m3 = () cubic decimeter = () ml
15. Is unit conversion formula 1 mm mm
16. How much m is 1 mm? I mean what?
17. Rearrange a three digit number to get the maximum three digits minus the minimum three digits, which is exactly equal to the original number, then what is the three digit number? I just scraped up 495. Is there any other way to get this number?
18. How many combinations of eight digits can the ten numbers 0-9 form? Among them, the ten numbers 0-9 can be repeated at will. Can you list them How many digits do you have I don't think we should start with 0. We need 8 digits
19. Use 1, 2, 3 and 4 numbers to form a four digit number, in which each number is used once. What is the sum of all four non repeating digits like this
20. How many combinations of three digits are there? The answer is 225,