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 comprised of th 8ofxu0/bj(l8z(xw w xcqj4t of0m+f. e inclined pla lz5 y0fu(s5dm) 7ezfone and pulley sho uzd )o zfe(sf5m75l0ywn, 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?
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:
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