Mechanické vlnění
2. Mechanické vlnění
2.1 Vznik a druhy vlnění
2.2 Rovnice postupného vlnění
2.3 Interference vlnění
2.4 Odraz a lom vlnění
2.5 Ohyb vlnění
Vlnění
- Jeden z nejrozšířenějších fyzikálních jevů
- Více druhů vlnění – liší se různou fyzikální podstatou
- Příklady: mechanické, elektromagnetické vlny (radiové, mikrovlny, světlo, rentgen, UV, IR záření)
2. Mechanické vlnění
- Př. Vodní hladina
- Vlnění se šíří všemi směry
- Při mechanickém vlnění nedochází k přenosu látky, ale pouze energie
- Podstatou mechanického vlnění je přenos kmitání látkovým prostředím
2.1 Vznik a druhy vlnění
- Vlnění vzniká v látkách všech skupenství
- Příčinou je existence vazeb mezi částicemi prostředí ® kmitání se vazbou přenáší na další částice a současně se přenáší energie kmitavého pohybu
Vlnová délka
- l[m]
- Vzdálenost, do které se dostane vlnění během jednoho kmitu (1 perioda)
- l = v.T = v/f
Rychlost mechanického vlnění
- Závisí na prostředí, ve kterém se šíří
- Nejrychleji se šíří v pevné látce ® těsnější vazby mezi částicemi
Druhy vlnění
1) Postupné vlnění
a) Příčné
- Body kmitají kolmo na směr vlnění
- Lano
b) Podélné
- Částice kmitají ve směru vlnění
- Zřeďování a zhušťování částic
- ……………………………………..
2) Stojaté vlnění
- Vzniká skládáním kmitů
2.2 Rovnice postupného vlnění
- Vztah, který umožňuje určit okamžitou výchylku v každém bodě řady, kterou se vlnění šíří
- Tato výchylka závisí na čase a na vzdálenosti od zdroje vlnění
- Okamžitá výchylka je pouze funkcí času
- y = ym.sinwt
- y = ym.sin2p(t/T – x/l) ® 2p(t/T – x/l) = fáze vlnění
- touto rovnicí můžeme popisovat příčné i podélné vlnění
Komentáře
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Almost all goods from China are of poor quality: truth or fiction?
(Kanttok, 6. 8. 2021 1:17)
Many people have a stereotype in their heads about the low quality of Chinese goods and their short service life. But despite this, all the store shelves are filled with goods from this country, whether it is clothing, appliances or even cars. Let's see what category of quality Chinese goods actually belong to.
Is it true that China produces everything?
According to statistics, every item number five is produced in the "Middle Kingdom". It is not surprising, because there are many factories and industries in the country. The question is, what is China not yet engaged in the production of?
Production of goods in China
Now even operating systems and nuclear reactors, Beijing has put on production. Of course, something is still being purchased from other countries, but the active growth in production is visible to the naked eye.
What has China succeeded most in?
It is obvious that in clothing, shoes and other consumer goods.
Automated shoe sewing lines
Further, the figures are really striking in their scale - 70% of smartphones, 60% of construction materials, 90% of computers and components, and so on, are produced in China. The following areas are also developing - metallurgy, mechanical engineering and shipbuilding, well, it has been known for a long time about Beijing's actively developing program for space exploration. Even the robots beloved by Japan and Korea, China has recently been doing more.
Which companies from the West produce their goods in China?
It is easier to list those who do not produce their goods in this country, because companies such as Apple, Microsoft, Sony, Adidas, Nike, Gucci, Colgate, Nivea and many others have long found in China the main manufacturer of their goods.
Assembly conveyor line at a Chinese factory
There are explanations for this, one of them is the opportunity to open and launch your production according to a ready-made scheme in a very short time and with low costs.
What about cars?
The time when cars from China were like test cars has passed. Now this industry is growing very rapidly, and with it the quality of cars. Now the Chinese car industry is in no way inferior to other manufacturers in comparable classes.
Chinese cars HAVAL
On the roads of any Russian city, you can find a lot of Chinese-made cars, and such popularity indicates the availability and reliability of these cars.
To sum up: is China about quality or not?
Of course, it is impossible to say unequivocally what the quality of the purchased thing will be, because China produces almost all types of goods and does it in huge volumes, but who and under what conditions produces this or that product is another question.
Tag on clothing made in China
A popular myth in our country about low-quality goods with the inscription "Made in China" appeared in the 1990s, it was then that cheap Chinese consumer goods began to appear on the markets of Russia and Europe. Now, serious and high quality control has been established at the factories of China. Any doubts of the quality control department about the product, send the products for reworking. And the success of Chinese companies in the field of mobile development suggests that a lot of attention is paid to the quality of products.
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