如果有一个秋千是从月亮上垂下来的韧做在上面一天股票会不会跌没了绕地球一圈

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一个小孩荡秋千,已知在秋千最低的时候,小孩的速度为3.4米/秒,在此过程中求秋千绳子对小孩的拉力所做的忽略小孩会不会在上面乱动.以下是英文原题,可能我翻译的不太准确,懂英语的朋友可以看原题来解答At a local playground,Bob swings on a swingset.He has a speed of 3.4 m/s when the swing is at its lowest point.During this process,how much work is done on Bob by the tension in the rope?请写出必要的过程~能让我看懂我会加悬赏滴~
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0吧.重力在做功,绳的拉力和位移垂直
其他类似问题
你的问题翻译的有点问题,应该是“求秋千绳对小孩的拉力”我们都知道向心力公式为F=m*v*v/r,(其中为m小孩质量,v为速度,r为绳长),把数值带进去就可以了,你这个题目应该不完整吧,只是一部分,小孩的质量和绳长都不晓得 不好意思
可能是我翻译错了
就做工的话
上面那位仁兄是对的...
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一道科学关于曲线运动的选择题下面不是曲线运动的:A地球绕太阳运动B荡秋千C光信号在光缆中绕地球一圈D运动员在操场中跑三百米请说出它的理由!还请问一个问题:光有可能沿曲线传播吗?
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2亿+学生的选择
c光是沿直线传播的,他在光缆中是经过无数次的折射前进的
其他类似问题
物体运动轨迹是曲线的运动,称为“曲线运动”。当物体所受的合外力和它速度方向不在同一直线上,物体的运动就是曲线运动。所以选D
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