本题目来源于试卷: Centre of mass system，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.34: A 9.20 m long uniform plank rests on a frictionless i be8sbkr6h,v 9ce pond. A 52 kg rop,p5t+8euq*r7 qu;p g0r mvbox rests on the plank’s left end while a 71 kg person st 5u 0to+q7 ;r*v 8m urqgprepp,ands at the plank’s right end. After the person walks to the left on the plank and stands at the same location as the box, the plank has slid 3.84 m to the right relative to the pond’s shore. Which one of the following choices best represents the mass of the plank?
A. 123 kg
B. 61.5 kg
C. 47.1 kg
D. 36.5 kg
E. 31.2 kg
参考答案: C
本题详细解析:
暂无
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