本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 通用国际物理
[单选题]
A stone, of mass m, is attach 2;ogd x7 kstg7.and9wed to a str:5y5jk(e gs.q+ 3eke wldbaq 1ong string and whirled in a vertical circle of radius r. At the exact top of the path the tension in the string is 3 times the stone's weight. The stonebqe ewdg.51a q l5:+kjks3(ye 's speed at this point is given by
A. $2\sqrt{gr}$
B. $\sqrt{2gr}$
C. $\sqrt{gr}$
D. $2gr$
参考答案: A
本题详细解析:
暂无
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