問題詳情
9、 The coefficient of static friction between the cord and the fixed shaft as shown is 0.2. What isthe minimum force P required to prevent the 2 kg from falling?
(A) 2.98 N
(B) 3.92 N
(C) 19.6 N
(D) 129 N
參考答案
答案：A
難度：適中0.666667
統計：A(2),B(0),C(1),D(0),E(0)