本题目来源于试卷: Angular Momentum，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.24: What condition mli gx)e/1f/ yrust be met for the r5hj k 7naj4 cchun+,1angular momentum of a system to be consta cn1j4uhrka7, 5jnh+ cnt?
A. The mechanical energy is constant.
B. There is no net external force acting on the system.
C. The system is in static equilibrium.
D. There is no net external torque acting on the system.
E. Only the gravitational force is acting on the system.
参考答案: D
本题详细解析:
暂无
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