最近的一則新聞
http://n.yam.com/view/mkvideopage.php/20100614765322
特3號長陡坡 不踩油門能飆80公里 (請把影片看完)
1.公路的坡度計算是以多少% 計算 不是算與水平線夾角θ幾度表示
2.坡度是以tanθ表示 但是一般因為tanθ比較不易測量 所以都以sinθ代替
因為在θ小的情況之下(8%的坡θ=5°)
sinθ大約等於tanθ(基本上20%以內的坡都適用)
3.影片中的坡我用尺量了一下 tanθ=4/15=0.26=26% 算是陡坡了
但是根據三角函數值表θ大約等於15°記者硬要說30度
4.θ=15°的坡為26% 腳踏車要騎上去已經是非常吃力了
θ=30°的坡為58% 腳踏車要騎上去除非坡很短 不然還用牽的吧
不知道為什麼 看到這樣的報導就很生氣
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◆ From: 111.255.176.88
※ 編輯: cann 來自: 111.255.176.88 (06/15 11:57)
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