挂在墙壁上的石英钟,当电能耗尽而停止走动时,其秒针往往会停在哪个数字上? A.3 B.6 C.9 D.12

作者: rantiku 人气: - 评论: 0
问题 挂在墙壁上的石英钟,当电能耗尽而停止走动时,其秒针往往会停在哪个数字上? A.3 B.6 C.9 D.12
选项
答案 C
解析 .[解析]本题是考查物理学力矩相关知识的题。当秒针走到9点位置时,秒针受到重力的力矩方向向下,与表本身受电能驱动行走的力矩方向恰好相反,达到平衡状态,因此通常停在9点钟附近位置,所以选择C选项。

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