Second, he looked at these people and measured how fast they walk from where their experiment was to the elevator.
第二,他观察这些人,记录他们从实验地点,走到电梯的时间。
But ah... yes, there is a slight problem with the elevator.
但是,呃……对,电梯出了点问题。
First, take the case in the elevator is on the ground floor of some building and completely addressed.
首先我们来看看电梯,在一楼时候的情况
Whether you take the elevator to the top of the Hancock Tower or whether you walk up the stairs, the change in gravitational potential is identical.
不管你是乘电梯,去大厦的顶层,或者是步行,重力势能的变化是相同的。
And they walk significantly slower toward the elevator, not knowing that they were primed with old words.
走向电梯的速度明显慢,虽然不知道自己被与“老“相关的字影射过。
There is a slight problem with the elevator.
电梯出了一点小故障。
It means, when you are accelerating upwards, as the elevator picks up speed, the reading on the spring will be more and you will feel heavy.
也就是说当你向上做加速运动时,就像电梯加速的时候,弹簧的读数会增大,你会觉得自己变重了
We all know that in a falling elevator, you definitely do not escape the pull of gravity.
我们都知道在一个下坠的电梯里,你当然还是会受到重力的
I'm going to give the last class a problem which is pretty interesting, which is what happens to you when you have an elevator.
我将讲解最后一个例题,非常有趣,也就是当你在电梯里的情形
Now, what happens if the elevator is accelerating upwards with an acceleration a?
现在如果电梯向上以加速度 a 运动,会发生什么呢
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