本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
12.22: A girl swings a 4vaa :m;njrolgl k( .uj 4*h;6h.0 kgqlrg.8 s1jy jd9 yk6v; mass with a constant speed of 3.24 m/s in a vertically-orjjy8g r ;961ysqkldv.iented circle of radius 0.75 m. What is the net force acting on the mass when it is at the lowest point of the circle?
A. 96 N
B. 56 N
C. 40 N
D. 16 N
E. 0 N
参考答案: B
本题详细解析:
暂无
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