本题目来源于试卷: Circular Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
05.28: A mass, M, is at reqi8 i80s dsr-sst on a frictionless surface, connected to an iaeu ga.ds59e,1oy/b xz s5w2v deal horizontal spring that is upstretched. A peru,1bwvyaa.sx/9ze s2ode55 g son extends the spring 30 cm from equilibrium and holds it at this location by applying a 10 N force. The spring is brought back to equilibrium and the mass connected to it is now doubled to 2M. If the spring is extended back 30 cm from equilibrium, what is the necessary force applied by the person to hold the mass stationary there?
A. 20.0 N
B. 14.1 N
C. 10.0 N
D. 7.07 N
E. 5.00 N
参考答案: C
本题详细解析:
暂无
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