本题目来源于试卷: Angular Momentum，类别为 美国物理杯赛(Physics Bowl)
[单选题]
06.23: An object m, on the end -ii:*hrrl x+u dr. a g:o8jqk. of a string, moves in a circle on : el4z;1ho ebf a horizontal frictionless table as shown. As the stri l;hez1fo4:eb ng is pulled very slowly through a small hole in the table, which of the following is correct for an observer measuring from the hole in the table?
A. The angular momentum of m remains constant.
B. The angular momentum of m decreases.
C. The kinetic energy ofm remains constant
D. The kinetic energy of m decreases
E. None of the above occurs.
参考答案: A
本题详细解析:
暂无
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