1, Winter Olympics city and temperature: positive and negative.
This Winter Olympics is hosted by Beijing and hosted by Zhangjiakou. Why choose Zhangjiakou instead of the northeast where the temperature is lower? In addition to distance, it also has a lot to do with temperature. Previous Winter Olympics are usually held in February, and the temperature-17℃~ 10℃ is the most ideal temperature.
2. Graphics in the Winter Olympics: axial symmetry and central symmetry.
The medals of the Winter Olympics are round, the five rings of the Winter Olympics are axisymmetric figures composed of five circles, and the snowflake guide card is central symmetry.
3. Ski jumping trajectory: parabola
Take the frog princess Gu Ailing's third jump as an example. The speed assisted by skaters can reach 24 meters per second. When the skater slides, we will see a beautiful parabola whose trajectory can be abstracted as a quadratic function image. What is the maximum height of the skater from the ground?
4. Number of Winter Olympics venues: Understanding of Numbers
The National Speed Skating Hall, also known as the "Ice Belt", is the only newly-built ice competition venue in this competition. The National Speed Skating Hall covers an area of 17 hectare, with a 400-meter-long track and the ice surface reaches the highest standard in the world. The venue can accommodate about 12000 spectators.
The National Ski Center is also called "Snow Ruyi". The platform length of HS 140 is110m, and the drop is135m. The standard platform length of HS 106 is 106m, and the drop is 1 15m.
The national snowmobile and sleigh center is the competition venue for snowmobiles, sleds and steel snowmobiles in Beijing Winter Olympics. The stadium has 16 bends with different angles and slopes. The center covers an area of 18.69 hectares, with a building area of 52,500 square meters and a structural area of 2 1500 square meters.
5. Winter Olympics events: classification and combination
This year's Beijing Winter Olympics has 7 major events, 15 minor events and 109 minor events.
Taking short track speed skating as an example, it is divided into men's events, women's events and mixed events, including 500m, 1000m, 1500m and 2000m, 3000m and 5000m relay events.