本题目来源于试卷: Angular Momentum，类别为 美国物理杯赛(Physics Bowl)
[单选题]
0.33: A figure skater has a mn*172pd ok j./v 6t3tv xm yua2e)rpaaomf-u3 b:3rq :6 uhanipfent of inertia of $5.0 kg.m^{2}$ with her arms outstretched. If she begins a spin at 2.0 rad/s with her arms outstretched and then brings her arms in tight to her body, her rate of spin increases to 8.0 rad/s in 3 seconds. Friction and wind resistance can be considered negligible.
What is the skater's angular acceleration as her arms are moved in during the three second interval?
A. $0.67\;rad/s^{2}$
B. $1.7\;rad/s^{2}$
C. $2.0\;rad/s^{2}$
D. $2.7\;rad/s^{2}$
E. $3.3\;rad/s^{2}$
参考答案: C
本题详细解析:
暂无
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