This should be around 55 m/s. This number is close to the terminal velocity of the human body in free fall. Free fall terminal velocity is the speed when wind resistance = gravity. To stand upright into the wind, the wind speed must be less than 55 m/s. If it is considered vertical if it is tilted below 10 degrees, the wind speed cannot exceed 26 m/s. If the shoe/foot is stationary relative to the ground this does not count as flying, you need to take into account the coefficient of static friction between. the shoe/bare feet and the ground. The shoes are considered rubber. The coefficient of friction between rubber and dry asphalt/cement is approximately 0.6 to 0.9. The wind speed exceeds 30 m/s and it can remain stationary. The coefficient of friction between human skin and other materials has not been found. should also exceed 30 m/s bar. Digression: If you do the experimentnothing, you might be able to do it in the water. The resistance of water is 800 times greater than that of air. Dimensional analysis can then determine the required air speed. However, the buoyancy factor that can be ignored in air does not know how to eliminate it in water. Digression: According to the relationship between the surface (subject to wind resistance) and the volume (weight) of the square and the third. power, it's harder for a big man to blow himself up. We Some scenes you see in movies don't happen in reality: people who get shot don't fly backwards, and emptiness doesn't hurt you. explode. But strong winds can definitely blow someone up. In fact, if you were in a parking lot, the wind would not only blow you away, but it would even tear off a layer of the roadway! When the wind speed reaches 120 kilometers per hour, it doesn't matter how hard youIf you lean forward, you will no longer be able to stand up; you will first slide backwards on the ground, then fall and start doing somersaults. But you are less likely to be “thrown” very high by the wind. If the wind blows completely horizontally, you will trip and fall. If you are lucky enough to hit a slope, you will easily fly into the sky and fall far away. The good news is that winds of 500 km/h are very rare. The strongest hurricanes can reach wind speeds of around 200 kilometers per hour, and gusts can even reach speeds of up to 250 kilometers per hour. Tornadoes can reach speeds of 300 miles per hour. But we are still far from 500 miles per hour. A 500 mph wind generates several times the force of a 300 mph wind.
What are the advantages and disadvantages of wind?
Harbin Bayan County was hit by aLevel 7 tornado during attack, top of head. was torn off, the colorful steel tiles were swept away without a trace, many buildings were damaged, and the scene became a disaster. This tornado attack caused a lot of damage in the area. When a tornado comes, we must be careful to run in the opposite direction of the tornado. Indoors we should stay away from doors and windows. wild, we should stay away from trees and power lines and other easily collapsed buildings to avoid getting hurt from these easily collapsed buildings, try to take shelter in the basement air raid shelters and in d other places. in telephone poles, trees and other places where tornadoes easily appear. When it is windy at night, try to hide in the basement when a tornado arrives. If there is no basement, you can hideer under the table to prevent the building from hurting your head. ? When a tornado arrives, you will experience severe storms and rain. Do not panic. Because when hail and tornadoes arrive, you must clearly observe the direction of the tornado. You must run in the opposite direction of the tornado before sending it. durable Do not stand under trees or moving buildings due to the sound of thunder. When you see swirling clouds, be careful not to panic, become curious, or follow the tornado. Although the level 7 tornado that hit Harbin's Bayan County this time caused a lot of damage in the area, it also warned everyone not to panic when seeing a tornado. When you encounter a tornado in a car, avoid the tornadoes. Avoid tornadoes in your car. The cause of tornadoes is convective weather. ? This time, Bayan County,Harbin was hit by a level 7 tornado. The local government has taken corresponding measures and will strive to restore normal life for everyone as soon as possible.
1. Wind can spread pollen and plant seeds, helping plants pollinate and reproduce. For example, the most common example is that dandelion seeds are spread by wind.
2. Wind energy is a widely distributed and inexhaustible energy source. By using wind energy to produce electricity, we reduce the use of fossil energy and protect the environment.
3. Wind plays an important role in improving the environment of agricultural land. Air is known to flow to form wind, which transports and exchanges carbon dioxide, oxygen, heat, etc. in the air. Create conditions for crop growth.
Disadvantages
1. The impact of the windstrong on the ground. Strong winds can cause soil erosion and land desertification. For example, the formation of the Loess Plateau.
2. Disadvantages of wind energy for agriculture. Wind actually plays a dual role in agriculture. It can spread pathogens, spread plant diseases, cause crops to fall, break trees, drop flowers and fruits, etc., thereby harming production and people's lives.