作者degraded (事与愿违的遗憾)
看板TransPhys
标题[力学] 请问 一题halliday 8th的问题
时间Fri Oct 19 20:45:42 2007
Calculate the ratio of the drag force on a jet flying at 963 km/h
at an altitude of 8.4 km to the drag force on a prop-driven transport
flying at half that speed and altitude.
The density of air is 0.47 kg/m3 at 8.4 km and 0.72 kg/m3 at 4.2 km.
Assume that the airplanes have the same effective cross-sectional area
and drag coefficient C.
想请问这一题的题目在问什麽
然後怎麽算??
因为本身普物还没教到drag force
然後有同学要问这题
想请求板上高手的帮忙
谢谢!!
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.117.183.62
※ degraded:转录至看板 Physics 10/19 21:27
1F：推 brahmsliu:基本上....前面一有一张是教drag force的 10/20 22:39
2F：→ panpan19:能看到这题应该就教过了~查查老师的投影片应该是有=.= 10/25 17:35