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About big city & small town

Before the Industrial Revolution, most families lived in the country because of the lack of development around the world. Generations ago, most people lived in rural area but today, with the advancement of technology more and more people have begun to move to the city. This is mostly due to the fact that city life has become more and more popular today. However, even with the advent of many technological inventions most people are divided between the city and the countryside.

글쓰기| 2023.04.15| 2페이지| 3,000원| 조회(2,784)

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Newton's law of gravitation/ 뉴턴의 중력법칙-사과는 왜 떨어지는가?

Newton’s Law of Gravitational force(why apple is fall down on the ground)C1-진**Newton invented many physical laws and improve physics good ways. Such as F=ma, action& reaction, inertia, and etc. And I researched Newton’s Law of Gravitational force. What is Gravitational force, Gravitational force is divided gravity and zero gravity. Gravity is as it says pull object so in the Earth we never fly away from ground when we jump and zero gravity is no gravity so when you are go to the space you are must fly away this is zero gravity. So discuss the topic why apple is fall down to the apple tree, the conclusion is because of gravity. The gravity pulled the apple finally apple will fall down on the ground. Now I will explain more detail about why apple is fall down on the ground.Firstly, I will explain Gravitational intensity, what is Gravitational intensity. It is The magnitude of gravity on the Earth's surface is obtained by doubling the mass and acceleration of gravity (g=9.8 m/s2). The gravity of 1kg object is approximately 10N.Secondly, the magnitude of the gravitational F acting on Newton's universal gravitation between the two objects (mass is m1 and m2, the distance r between the centre of mass) is as follows. The function of magnitude of the gravitational is F=G. Where G is the gravitational constant. Newton's universal gravitation has limitations that cannot be explained.Third, now I will explain about why apple is fall down on the ground. The Earth have gravitational force and apple also have gravitational force, so they are pull each other. And when the apple has enough weight to fall down on the ground, the apple’s force will increase and between them pulling power will increase so it will be fall down. If I just put this in the equation F=9.8.

자연과학| 2022.02.28| 1페이지| 2,000원| 조회(121)

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Nearly everything about Black hole/블랙홀에 관한 모든 것

Nearly Everything about Black holeV2-진**What is black hole?The black hole is one of very dangerous and interesting things in the universe and people mostly don’t know what is black hole. But is this quite a normal sense of our knowledge and me also don’t know what is black hole until I research about black hole and I have really interested about black hole. The black hole is really dark and gravitational pull is so strong, not even light can escape it and that everyone knows. However, we need to know about black hole more specifically and I will guide to black hole. Even Einstein cannot figure it out, so knowing basic knowledge is necessary for us.So what is beginning of the black hole, stars are incredibly massive collection of mostly hydrogen atoms that collapsed from enormous gas cloud under their own gravity. The star keep releasing energy and this energy pushes against gravity, maintaining a delicate balance between the two forces. As long as there is fusion in the core, a star rer a neutron star or if the star is massive enough, the entire mass of the core collapses into a black hole. The black hole is has a really incredible feature and nothing can mock this feature. The black hole can swallows up everything too close. It is no matter how big and small, the black hole will eat everything without mercy. The edge of a black hole, its event horizon, when you pass the event horizon, you must go faster enough than light. In other word it is impossible.The black part of the black hole is event horizon but the hole-part we don’t know what exist in there exactly. Some of scientists think may be in the hole-part of the black hole exists a lot of elementals we never seen. So how about if you fall into a black hole, can you imagine how you would die? We cannot imagine how you die in the black hole, but in March 2012 by a group of theorists including Donald Marolf, Ahmed Almheiri, James Sully and Joseph Polchinski announce the firewall paradox based on Einstein’s general make pull everything too close. So a black hole will pull you and your body and everything then you will reach to death. However, actually no one knows what is exactly happen in a black hole before happening.Here is another question, what if sun turn into a black hole. The solar system will face a huge danger? Of course yes, but let me say that cannot happen. The fact is the sun will not turn into a black bole. However, please imagine, if the sun turn into a black hole, the other planet will not disappear into a black hole or they will freeze? The answer is they will turn into a ice ball because, the black hole which the sun turn into black hole has same amount of gravitational force.All of the earthlings cannot see a black hole’s proper appearance. They saw indirect appearance of a black hole. The scientists use gamma ray burst, supernova or saw black hole’s event horizon for observing a black hole. However, nowadays scientists successfully catch how it looks like by using special me in the dark room. Is it looks a sphere or it looks like different shape? The universe is so dark enough to observe the light even a black hole can detect more easily when you follow the light for finding the darkness.Do you ever know a black hole is not forever? May be, some of people think it can be and how a black hole disappear. According to a quantum effect suggest that, as Hawking radiation is process which they will eventually evaporate through a time. At first Dr. Stephen Hawking announced Hawking radiation theory, no one believe it even Dr. Hawking too. But, nowadays many physicists research again and again Dr. Stephen Hawking’s Hawking-radiation theory related to gravity and quantum theory then they finally figure out how does it function and what is Hawking radiation. Many people afraid what if black-hole swallow everything existence in universe including the earth that is common issues when scientists figure out a black hole. However, in present, we don’t have to worry abouh other like yin and yang. This process always happened in void space, but what if positive particles and negative particles repeat this process near edge of a black hole. Dr. Stephen Hawking think if it happened near edge of a black hole, positive particles and negative particles push each other then negative particles will suck in to a black hole meanwhile positive particles going out of a black hole. Basically, these particles are energy and if the energy keep leak from a black hole, eventually balance will break down and finally a black hole will evaporate then disappear passed thousand of year.This is one of interesting fact about black hole because, most of people think a black hole just eat everything forever. The infinite black part of black hole attracts people and a black hole is mysterious phenomenon in universe. We cannot touch it, we cannot close to it and we cannot enter to a black hole. Likewise, we cannot find anything a real black hole. The scientists only explaining a.

자연과학| 2022.02.28| 3페이지| 5,000원| 조회(126)

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