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 large collection of identical he kui hb(yb+4w g56./.zubge kmn/ t ,rkavy ba y3bg 8 t(agerv k-0wb* eb,5wklls and lightweight rods. When tw ek(3b*twrbek gvb5gay-, 8 0wo 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 rod 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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