Calculating friction with known inclination angle of inclined pl

1.

The larger the inclination angle between the inclined plane and the plane, and the shorter the inclined plane, the smaller the labor saving, but the less the distance. Inclined plane is widely used in daily life, such as mountain road, conveying roller, inclined conveyor belt and so on

the mechanical efficiency of the inclined plane is 100% without calculating any resistance. If the friction is very small, the efficiency can be very high. That is to say, F2 is the force, s is the length of the inclined plane, h is the height of the inclined plane, and the weight of the object is g. When the useless resistance is not considered, according to the principle of work, it can be obtained that F2s = GH

if the slope of the inclined plane is smaller, that is, the angle between the inclined plane and the horizontal plane is smaller, the force applied to the object will be smaller, but the moving distance will be longer; vice versa. Assuming that the moving load does not cause energy storage or dissipation, the mechanical benefit of the slope is the ratio of its length to the lifting height

The friction between solid surfaces can be divided into sliding friction, rolling friction, static friction, rolling friction and rotational friction. In engineering technology, people use lubricating oil to rece friction

If two rubbing surfaces are isolated by a layer of liquid, liquid friction can occur between them. If the liquid isolation is not complete, mixed friction may also occur

air track works by air friction. The working principle of lubricating oil and air track is to use "liquid or gas (i.e. fluid) friction to replace solid friction" to work

2. Take Nanxiang express at ximengu station to Shantou. Tell the driver to get off at Huayuan Hotel (that is, don't take the bus to the station). After getting off, walk along the South Road of Mount Everest (I don't know, just ask the way) (about 10 minutes) and you can see the hospital on your right (with the Second Affiliated Hospital of Shantou)

3. It depends on what you buy. Selenium is really good for human body. If the proct quality is guaranteed, 3600 yuan can generally be eaten for about half a year. Continuous selenium supplement for half a year can make the constitution change dramatically. I sell selenium rich agricultural procts of the Chinese Academy of Sciences. If you buy selenium rich agricultural procts and the selenium content is qualified, you can eat them with confidence. If you buy selenium rich capsules, chewable tablets, oral liquid, etc., I suggest you take them for three months and stop taking them for one month. If the kidney is not good, try not to eat them as much as possible, because they involve the problem of purification and purity. They will contain 20% - 40% inorganic selenium more or less, which will add a heavy burden to the kidney, and infants, lactating mothers and pregnant women are strictly forbidden to eat them, Also can't overdose, don't believe the sales staff said how to eat more, so you are not worth the loss. Of course, it's much better in selenium rich agricultural procts. The Chinese Academy of Sciences has tested that it can supplement up to 1600 micrograms. As for what you said about being cheated, it should be the sales mode of dealers. There is no problem. They will not force buying and selling. If you buy it, it proves that you see the value of the proct and that you need it. There is nothing wrong with that.

4.

The national selenium supplement project is initiated by the Ministry of health of the people's Republic of China, not a pyramid marketing organization, but a legal and compliant national behavior. However, the national selenium supplement project does not involve any procts or collect funds from indivials. According to Article 7 of the regulations on the prohibition of pyramid schemes, the following acts are classified as pyramid schemes:

(1) organizers or business operators, through developing personnel, require other personnel developed by the developed personnel to join, and calculate and pay remuneration (including material rewards and other economic benefits, the same below) to the developed personnel based on the number of personnel developed directly or indirectly, Seeking illegal interests

(2) the organizer or business operator, through the development personnel, requires the personnel to be developed to pay fees or pay fees in disguised form by way of subscribing for commodities, so as to obtain the qualification of joining or developing other personnel to join and seek illegal interests

(3) the organizers or business operators, through the development personnel, require the development personnel to develop other personnel to join, form the relationship between the upper and lower line, and calculate and pay the online remuneration based on the sales performance of the lower line, so as to seek illegal interests

According to the actual situation of selenium deficiency in China, the Ministry of health of the people's Republic of China initiated the national selenium supplement Steering Committee to publicize and popularize selenium knowledge, guide Chinese people to supplement selenium correctly and reasonably, and promote the development, application and service of selenium biological resources

extended data:

methods of selenium supplement:

Artificial selenium supplement

all kinds of artificial selenium supplement procts are mainly divided into inorganic selenium and organic selenium. Inorganic selenium is mainly sodium selenite, which is mostly used in feed abroad, has a lot of toxins, and is on the edge of technology elimination. Compared with inorganic selenium such as sodium selenite, organic selenium has many advantages, such as food safety, non-toxic side effects, high absorption and utilization rate, high nutritional value and so on

There are many kinds of organic selenium, such as selenium yeast, selenium egg, selenium enriched algae, selenium enriched mushroom and selenium malt, among which malt selenium is the highest stage of the development of organic selenium at present, which has better activity, higher utilization rate and no accumulated toxicity than mushroom selenium and yeast selenium, and can be taken for a long time. It has no side effect and is good for absorption, so it is the first choice of selenium supplement

natural selenium supplement

eat wild and natural foods with high selenium content, such as 100 μ g plant active selenium of pure grain, supplemented with organic selenium, which is less toxic than inorganic selenium, but also need to supplement selenium scientifically according to the prescribed intake. Naturally occurring selenium foods are healthier than inorganic selenium. The natural supplement of selenium is more beneficial to health than inorganic selenium

5. It belongs to virtual currency,
and is set up by private companies,

is not protected by China's law,
it is recommended not to invest, so as not to be investigated and dealt with by relevant departments.

6.

Whether it belongs to MLM needs to be judged according to the specific operation mode< According to Article 7 of the regulations on the prohibition of pyramid selling, the following acts belong to pyramid selling:
(1) organizers or business operators, through development personnel, require other personnel developed by the developed personnel to join, and calculate and pay remuneration (including material rewards and other economic benefits, the same below) to the developed personnel based on the number of personnel developed directly or indirectly, Seeking illegal interests
(2) the organizer or business operator, through the developer, requires the developed person to pay fees or pay fees in disguised form by way of subscribing for commodities, so as to obtain the qualification of joining or developing other persons to join and seek illegal interests
(3) the organizer or business operator, through the development personnel, requests other personnel developed by the development personnel to join, forms the relationship between the upper and lower line, and calculates and pays the online remuneration based on the sales performance of the lower line, so as to seek illegal interests< The basic characteristics of MLM are as follows:
1. The price of MLM procts deviates from the actual value of the procts. Some MLM procts have no use value and service items are fictitious
2. The income of participants does not come from the reasonable profits from selling procts or services, but from the fees paid by others when they join

extended materials

MLM originated in the United States in the late stage of World War II, took shape in postwar Japan, and developed in China. MLM training materials are not only very inflammatory and deceptive, but also have many psychological elements, which are easily sective. In foreign countries, MLM and direct marketing have the same meaning, that is to say, there is only one concept of MLM in foreign countries. The main concept of foreign MLM is to use the word-of-mouth generated by customers' use of procts as the driving force, and let customers help dealers to share part of the profits after publicizing procts, that is, customer communication sales. This is different from the domestic concept of MLM

Chinese MLM is a fake company. It's a fictitious proct. Everything is empty. It's just for you to pull your head and draw a small percentage from the membership fee or franchise fee. Or control personal freedom, confiscate property, so that you can't contact the outside world, learn those MLM training materials every day, so that you can learn how to cheat people, and then make a list, telephone or letter invitation, showdown, follow-up, until you pay the membership fee or franchise fee in various ways

Chinese MLM is built on the basis of mind control, that is to say, you can organize MLM spontaneously after brainwashing through their MLM training; Others will control your personal freedom, confiscate all your belongings, and make you accept these lies through violence

social unrest such as family destruction and death. The essence of MLM lies in the illegal transfer and aggregation of finance through the development of offline marketing, which does not create social value. This is the essential difference between MLM and normal marketing. MLM is not a state act, nor can it be a state act. Although it has brought economic stimulus and promoted consumption, its organizational behavior has caused irreparable harm to most of the participants and violated the normal life and activities of human beings

7. Selenium, the personal demand is very small, generally every day to eat vegetables and fruits, meat, eggs, etc. can be added, excessive people easily cause poisoning and very serious. In reality, the function and function of selenium should be expanded infinitely to deceive the consumers.