題目出處：90 中央機械
A 16–foot long chain weighting m pounds per foot hangs over a
small pulley, which is 20 feet above the floor. Initially, the
chain is held at rest with 7 feet on one side and 9 feet on the
other side, as in Figure 1. How long after the chain is released,
and with what velocity, will the chain leave the pulley? (25%)
題目問"離開pulley時"，以我的想法是鏈條成整條垂直時即"離開pulley時"，
請問題目沒給pulley的尺寸是否有瑕疵？還是有其他意想不到的解法？
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※ 編輯: elongation (111.248.137.150), 02/11/2018 00:13:42