本题目来源于试卷: Rotational Equilibrium，类别为 美国物理杯赛(Physics Bowl)
[单选题]
11.49: An inverted “V” in sta uu3uh -mz8 gw+h t5/xlti xc,l5 +k gxg x0n4bhma1a9zg ;le,jv(c equilibrium is made from two uniform beams each of mass M=12 kg. Each beam of the xlb9,4 gjgvl+,5anm(k ;cx0 1exhazg“V” has the same length and makes an angle of $30^{\circ}$ with the vertical as shown in the diagram. Which one of the following choices best represents the magnitude of the static friction force acting on the left leg of the “V” from the level ground? The coefficient of static friction between each beam and the ground is $μ_s =0.76$.
A. 26.3N
B. 34.6N
C. 45.6N
D. 69.3N
E. 91.2N
参考答案: B
本题详细解析:
暂无
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