来自《耶鲁大学开放课程：基础物理 第7集 第7集》
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Put it into seconds, you get some acceleration. Yes?换算成秒 你就得到了加速度 请讲 -
Yes.是的 -
Right, exactly.是的 就是这样 -
In fact, if it's not a circle运动轨迹要不是个圆的话 -
it's much more complicated.问题就更复杂了 -
So, in this calculation we'll assume everything is a circle,所以计算时 我们假设所有轨迹都是圆 -
it turns out to be not so bad, even for planets.但就算对行星做此假设 结果也没差多远 -
So, if you do the v^2 / R,然后你算一下 v^2 / R -
you put the numbers in and you find把数值代进去你就会发现 -
the acceleration of the apple is 3600 times苹果加速度比月球加速度 -
more than the acceleration of the Moon.大 3600 倍 -
On the other hand, you find the apple and the Moon radii另外 你会发觉苹果和月球运动半径