Mechanical Advantage (id: 529939d89)

本题目来源于试卷: Mechanical Advantage，类别为 美国物理杯赛(Physics Bowl)

[单选题]
09.39: For the compound ma h: ev+ h)sn5h1k.t,rh y1bcyqch(gd yuf,mv2-yjx. yu-40x x luine comprised of the inclined plane and pulley shown, a 75N force is required to slide a box with mass M4d 0gx-muyy(f u2 xy.x -j,uvl=10 kg up the incline at a constant speed. What is the efficiency of this compound machine?

A. 1/3
B. 3/8
C. 1/2
D. 2/3
E. 3/4


参考答案:  D


本题详细解析: 暂无

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