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  • 一道AP微積分題目

    一道AP微積分題目
    A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat.
    If the rope is pulled in at a rate of 1.1 m/s,how fast is the boat approaching the dock when it is 8 m from the dock?
    只給答案也可以.能寫出詳細(xì)過程就更好了.
    英語人氣:978 ℃時間:2020-06-10 04:34:25
    優(yōu)質(zhì)解答
    設(shè)船到岸邊的距離為x,繩子長度為L
    根據(jù)勾股定理,x^2+1=L^2
    等號兩邊同時關(guān)于t求導(dǎo)
    得2x*dx/dt=2L*dL/dt
    已知dL/dt=1.1,x=8
    可以求出L=sqrt(65)
    所以16dx/dt=2sqrt(65)*1.1
    解得dx/dt=1.109
    錯了不要抽我.
    And do realize that if you asking this online is against school rules I will not be responsible.
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