竹女 發問時間: 科學數學 · 4 年前

工數問題-rope?

To tie a boat in a habor, how many times must a rope be wound around a bollard(a vertical rough cylindrical post fixed on the ground 即 繫船柱) so that a man can exert? First guess. Experiments show that the change ΔS of the force S and to the small portion of the rope is proportional to S and to the small angle ΔΦ in Fig.16(圖片省略) Take the proportionality constant 0.15. The result should surprise you!

1 個解答

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  • 4 年前
    最佳解答

    都有十圈八圈的

    • 竹女4 年前檢舉

      可以列式嗎><怎麼算的?

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