长为1米的细绳上系有小球,从A处放手后,小球第一次摆到最低点B处共移动了多少米?( )

作者: tihaiku 人气: - 评论: 0
问题 长为1米的细绳上系有小球,从A处放手后,小球第一次摆到最低点B处共移动了多少米?( )
选项
答案 A
解析 如右图所示,C点和A点关于中间的虚线对称,小球从A点到C点做自由落体直线运动,从C点到B点做半径为1米的圆周运动。故小球移动的距离为

猜你喜欢

更多 网友评论0 条评论)
暂无评论
错误啦!

错误信息

  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>