本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
12.11: A girl twirls :1 rw0vmi.hhbl qotf y.z l9ehp, 8;h(xet0v +pmsynxtee3 0--*30de rok a1 w a small mass connected to the end of a string counterclockwise in a horizontal circle above her head. The figure shows an outline of the mass’s path viewed from abov r-oted pv atyskx3*0wn0x+3e1 e me0- e the twirling mass. If the girl needs the mass to pass through the point labeled P in the figure, at which lettered point on the path should she let go of the string?
A.
B.
C.
D.
E.
参考答案: B
本题详细解析:
暂无
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