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 ball at the end of a rope,9fm war: kn:q 97qy4ie in a um0s.7.cnl 7mc7 ernyzl9lpe)j m,ri-niform circular motion. Which of the following r7 7cye)p..lneml0n9, lj-mizscmr 7statements is NOT 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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