本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
14.23:Two small identical coins (labeled X andY) are at b.ri3w lfm) 6hc :w9irks7 *woreston a z h 8h g-n gx6m3ww8(jtsmy1c7 horizontal disk hzjwy(st w7m81-83gxcmnh g 6 rotating at a constant rate about an axis perpendicular to the plane of the disk and through its center. The distance of the coins from the center of disk is related by $d_x=\frac{1}{2}d_x$. Which one of the following choices correctly identifies the relationship between $f_x$and $f_y$ , the frictional force on coin X and on coin Y, respectively?
A. $f_x=\frac{1}{4}f_y$
B. $f_x=\frac{1}{2}f_y$
C. $f_x=f_y$
D. $f_x=2f_y$
E. $f_x=4f_y$
参考答案: B
本题详细解析:
暂无
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