本题目来源于试卷: 2011 美国F=ma物理竞赛 F=ma physics competition，类别为 美国物理杯赛(Physics Bowl)
[单选题]
You are given a larg +)2l pdauyewax* 1 rkc27lnn+ e collection of identical heavy balls an ;g ,5urmjj sh+3 ge-tzd lightweight rods. When two balls are placed at the ends of one rod and interact through their mutual gravitational attraction (as is shown on the left), the compressive force in the r j u;t gj-hg3szre,+ 5mod is $F$. Next, three balls and three rods are placed at the vertexes and edges of an equilateral triangle (as is shown on the right). What is the compressive force in each rod in the latter case?
A. $\frac{1}{\sqrt{3}} F$
B. $\frac{\sqrt{3}}{2} F$
C. $F$
D. $\sqrt{3} F$
E. $2 F$
参考答案: A
本题详细解析:
暂无
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