[轉錄][問題] 國中物理問題...
※ [本文轉錄自 Wanted 看板]
作者: smallfinger (厭倦) 看板: Wanted
標題: [問題] 國中物理問題...
時間: Sat Sep 12 01:40:23 2009
但是我不會
整個算不出來啊啊啊
蝙蝠利用超聲波判斷他與物體的距離 若超聲波速度為340m/s
而蝙蝠接收反射波的反應時間為0.4秒
今蝙蝠以8m/s等速直線飛行
必須與障礙物保持約多少距離以上才不會撞到?
算很久都不對
有神人有辦法解嗎
整個被考倒
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