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 compou dfkx:f3 g./pdnd machine comprised of the zexquu fr t94 :-;5 n)jirzya0 inclined plane and pulley shown, a 75N force is required to slide a box with mass M=10 kg up the incline at a constant t0xr yqfz i9a ru4n)je- :5zu; 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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