本题目来源于试卷: Rotational Equilibrium，类别为 美国物理杯赛(Physics Bowl)
[单选题]
08.37: A uniform meter st ap0:jhv+ iqk, q)twhk8n0 ( nhick has a 45.0 g mass placed at the cm 20 mark as shown in the figure. If a pivot is placed at the 42.5cm mark and the meter stick remains horizontal in static equilibrium, what is the mass t 8(k0hnwhq n) of the meter stick?
A. 18.0g
B. 45.0g
C. 72.0g
D. 120.0g
E. 135.0g
参考答案: E
本题详细解析:
暂无
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