“2019年USAAAO决赛第9题”的版本间的差异
来自astro-init
Jingsong Guo（讨论 | 贡献） |
Jingsong Guo（讨论 | 贡献） |
||
| 第2行： | 第2行： | ||
9. (15 points) | 9. (15 points) | ||
| − | a) Find the shortest distance from Boston ($$42.36010^{\circ} N, 71.05890^{\circ} W$$) to Beijing (39.90420^{\circ} N, 116.40740^{\circ} E)traveling along the Earth’s surface. Assume that the Earth is a uniform sphere of radius 6371 km. | + | a) Find the shortest distance from Boston ($$42.36010^{\circ} N, 71.05890^{\circ} W$$) to Beijing ($$39.90420^{\circ} N, 116.40740^{\circ} E$$)traveling along the Earth’s surface. Assume that the Earth is a uniform sphere of radius 6371 km. |
| − | b) What fraction of the path lies within the Arctic circle (north of 66.56080^{\circ} N)? | + | b) What fraction of the path lies within the Arctic circle (north of $$66.56080^{\circ} N$$)? |
2020年3月7日 (六) 18:10的最新版本
英文题目
9. (15 points)
a) Find the shortest distance from Boston ($$42.36010^{\circ} N, 71.05890^{\circ} W$$) to Beijing ($$39.90420^{\circ} N, 116.40740^{\circ} E$$)traveling along the Earth’s surface. Assume that the Earth is a uniform sphere of radius 6371 km.
b) What fraction of the path lies within the Arctic circle (north of $$66.56080^{\circ} N$$)?
