本题目来源于试卷: Rotational Equilibrium，类别为 美国物理杯赛(Physics Bowl)
[单选题]
04.33: A uniform rectangular solid of side kfx7n 8h0wmycar29k6j*x ; lh,a ) m; th(ghli length Land w :w2 +ga fw2tknidth w sits on a frictionless incline of variable angle θ . Assume k+2fw : 2awngtthat there is a very tiny peg preventing the box from sliding down the incline at the point labeled P. At what angle of incline will the box begin to tip over?
A. $θ = sin^{-1}\frac{W}{L}$
B. $θ = cos^{-1}\frac{W}{L}$
C. $θ = tan^{-1}\frac{W}{L}$
D. $θ = cot^{-1}\frac{W}{L}$
E. Values for w and L must be known.
参考答案: D
本题详细解析:
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