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 r nxw)x i lz r g)-1o9gnrj3,azk-mg0b3ope, in a 9: f tba .pgnyi52-myrb,6may uniform circular motion. Wn,fba2yr9ytm i-pg5 ya 6: b.mhich of the following statements 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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