本题目来源于试卷: Typical Forces，类别为 美国物理杯赛(Physics Bowl)
[单选题]
00.32: A block rests on a frl/jw5rm,nl wk hm(i95c07 a qlat plane i)(u, gjga bnxk8;n6 zanclined at an angle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?
A. $\frac{1}{2}$
B. $\frac{1}{\sqrt{2}}$
C. $\frac{1}{\sqrt{3}}$
D. $\frac{1}{4}$
E. $\frac{2}{\sqrt{3}}$
参考答案: C
本题详细解析:
暂无
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