1、1spherical transformation, use an air pipe to pump up air 2, it may be that the football is deformed, so there is no choice but to buy it and play; Earthspherical transformationThe temperature is warming, that is, getting hotter. Because the current economic development has led to more carbon dioxide emissions from industrial emissions and automobile exhaust emissions, which has exceeded the range of nature, leading to global warming.spherical transformationWhy do we feel less in winter than in the past? The cold winter is because global warming has led to sea levels rising. The sea water in coastal areas has risen compared to normal conditions. At the same time, mid-latitude areas still feel it; At the beginning of the first set of techniques, three balls were changed. Wang Baohe used this set of techniques. Step1 When using the first bowl to smash the ball, the ball was not in the bowl, but in the left hand, and it was instantly transferred to the hand holding the chopsticks. Step2 When using the second bowl to smash the ball, throw the ball into the second bowl at the moment of deduction, so that the second bowl has 2 balls. If the magic only goes here, a smart person will guess that Wang Baohe's most brilliant part is in the first bowl.
2. Firstspherical transformationLet's talk about why a deformed table tennis ball will recover when it is put in hot water. Simply put, it will expand and contract. Of course, we can also say it more scientifically because the ball is a sealed spherical shell structure, and the number of gas molecules in it is certain. When placed in hot water, the temperature of the water is higher than that of the ball and the air in the ball. Heat transfer occurs between the ball and the hot water and becomes heated. The air in the ball is heated, the molecules accelerate, thermal expansion occurs, and the intermolecular spacing increases; Why did the diameter of table tennis balls increase from 38 mm to 40 mm in 2000? Kong and Liu, these two people had a significant impact on playing after the reform of the big ball. Liu once visited Jinxing on the show and mentioned that the main reason for the ball becoming bigger was in the program. Liu also mentioned that Xu Yinsheng, chairman of the Table Tennis Federation, who advocated "small balls becoming big balls", was one of the three giants of China's table tennis. In 1979, he served as vice chairman of ITTF and chairman in 1995. When he left office in 1999, the small balls became big balls.
3. The size of the table tennis rubber may be caused by the evaporation of organic solvents in the glue, which causes the rubber to expand, or because the rubber and the bottom plate do not fully adhere to each other after being coated with water, and there is air in the middle, which causes the rubber to expand under the action of air. If the rubber has become bigger, you can try the following methods to adjust 1. Wait until the rubber shrinks a little before bonding. Since the organic glue evaporates, the rubber will naturally shrink, you can wait for a while and wait for the rubber to shrink; In the old small ball era, rotation and speed came first. After the ball became bigger, speed and power gradually gained the upper hand. Because the ball became bigger and the rotation dropped slower, if you wanted to play the original speed, you must have enough strength to support it. As for how advanced it is, it's impossible to talk about it. After all, when playing at the level of the five main players, there is not much difference in strength. It's just that everyone has ups and downs, and there is no continuous high performance. As long as the stability is relatively good, Sun Ying will be more prominent; Force forward is literally what it means. As long as force forward, the ball will move in the opposite direction, and rotation is relatively difficult. 3 Changing the rotation, to put it bluntly, is to turn the topspin ball into a bottomspin ball or the bottomspin ball into a topspin ball. How to do it? First, use the opposite friction to make the rotation of the ball become 0, and then give it a force to generate rotation. That is what we call the reverse connection method. All rotations can be done, but beginners are more suitable for bottomspin; The warming and heating of the earth are not uniform, but increasing in temperature. That is, the closer the earth gets to the sun, the faster it warms. In the next 2.5 billion years, the total temperature will increase by more than 400 degrees. It is expected that the first 10 million years may only increase by 1 degree, the first 50 million years will increase by 6 degrees, the second 50 million years will only increase by 7 degrees, the third 50 million years will increase by 10 degrees, the fourth 50 million years will increase by 40 degrees, and the fifth 50 million years will increase by 360 degrees. Because the Sun has a 62.5 million-year winter in the Milky Way; 5. Air pollution increases the accumulation of heat. The heat emitted by the sun is short-wave radiation, but the air cannot directly absorb this heat radiation. After the solar radiation reaches the ground, it is reflected into the air through the ground. Part of it is reflected by solid particles, water vapor and clouds existing in the atmosphere. After being reflected by them, the solar radiation becomes long-wave radiation. The air can absorb this radiation, thereby raising the temperature and radiating the other part into space through the atmosphere. If the air is.
4. The first set of techniques: Three balls change at the beginning stage, Wang Bao used this set of techniques. Step1 When using the first bowl to spike the ball, the ball is not in the bowl, but in his left hand, and it is instantly transferred to the hand holding the chopsticks. Step2 When using the second bowl to spike the ball, he throws the ball into the second bowl at the moment of deduction, so that there are 2 balls in the second bowl. If the magic only goes here, a smart person will guess. Wang Baohe's most brilliant thing is; There may be the following reasons why Amaryllis balls turn black. 1. Over-immersion Amaryllis is a hydroponic plant that grows in water. However, if the Amaryllis balls are immersed in water for a long time, especially in the dark, it may easily lead to excessive wetting of the balls. Suffocation of the roots, which will cause the balls to rot and blacken. 2. Lack of oxygen If the Amaryllis balls do not have enough oxygen supply, the roots will be affected by hypoxia, which may be due to excessive immersion or water quality.
5. After a table tennis ball is soaked in hot water for a long time, the air inside will expand excessively. This is because the joints of the table tennis ball are harder than other places, so the table tennis ball will expand unevenly, and the joints will expand slightly, while other parts expand greatly, so the table tennis ball will become an ellipsoid. After a table tennis ball is soaked in hot water for a long time, it will become an ellipse. The main reason is that the surface material of the table tennis ball will absorb heat and expand when encountering hot water. At the same time, due to; When rolling the ball, raw rubber can produce two types of rotating backspin ball and non-rotating weak topspin ball. Raw rubber is rubber with the upward diameter of the particles greater than the height. It is characterized by sinking the ball and rotating the ball. When handling serving or in-table ball, you can use rolling ball bouncing or quick dial technology. The friction of raw rubber is insufficient, and the degree of backspin of the rolling ball is not as good as that of reverse rubber, because the rolling ball of reverse rubber relies on the friction between the ball and the rubber, rubbing downwards; The size of table tennis has changed. The change from a small ball to a large ball is no accident. It is a decision made by the International Table Tennis Federation to promote the popularization and development of table tennis on a global scale. China has made great achievements in table tennis. China players can be seen in almost all international competitions. This strong strength and influence have caused some countries to begin to shake their confidence in developing table tennis; The newly purchased football is very hard. There are these ways to make it soft. 1 The main reason why the football is very hard is that the air pressure is too high. Reduce the air pressure of the football appropriately. If you hit it to a more suitable air pressure, you can hold the ball flat with your waist. Gently loosen your hands and let the ball land freely. The ball can bounce 20 centimeters above the knee. 2 Since the new football has not experienced many collisions and the fabric tension on the skin is high, it will be relatively hard to get the new football.
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