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 machisf2bf v 0,,vwgne 5p6l hgh(df/w comprised of the inclined plane and pulley shown, a 75N w6dhl(h/ 5 pfg force is required to slide a box with mass M=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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