本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
99.22: A child whirls a bal)a6yyj./b- 2wmwr g9zsfn2s jl atihg39y6xj e 4;cds ls9 the end of a rope, in a uniform circular motion. Which of the following statements is NO4hg939lj;x essci d6y T true?
A. The speed of the ball is constant
B. The velocity is of the ball is constant
C. The radius is constant
D. The magnitude of the ball's acceleration is constant
E. The acceleration of the ball is directed radially inwards towards the center
参考答案: B
本题详细解析:
暂无
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