[领域] 力学 (题目相关领域) [来源] halliday 8th (课本习题、考古题、参考书...) [题目] 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. [瓶颈] (写写自己的想法，方便大家为你解答) 不好意思 题目有点长 我想请问这个题目是在问什麽 以及要怎麽解 因为本身学校物理还没有教到怎麽算 drag force 但是有朋友拿这个题目问我 希望板上的高手能帮忙 谢谢!! --

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