本题目来源于试卷: Basic Concepts，类别为 美国物理杯赛(Physics Bowl)
[单选题]
07.07: A mass connected to a p9e+(fetn ost;e(rx 9gy w5 h* string sw c+q; (l q9oazx 6vtzm/ e ar;2q.w4wiaings back and forth as a pendulum with snapsh zaalc+q9w4e6t ;/wmv(2iz .oq x;aqr ots of the
motion seen in the figure. Ignore the friction in the system. Which of the following statements about the pendulum-Earth system is correct?
A. The total mechanical energy in the system is constant.
B. The total mechanical energy in the system is maximum at B.
C. The potential energies at A and C are equal.
D. The kinetic energies at C and D are equal.
E. The kinetic energy at E equals the kinetic energy at C.
参考答案: A
本题详细解析:
暂无
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