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 machine u7y)0 1tgwuu:;jjqwz c yfrxl+(ntee1:jdywui1p53, omprised of the 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 speed. What is the efficiency of this compound machine e piu+lx1jyen,1w (d 5yf3t:r?
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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