00:01
In this problem, we're going to talk about length contraction.
00:03
So consider that we have a reference frame.
00:07
I'm going to call it the s reference ring.
00:11
And we have a certain object at rest in this reference ring.
00:16
And the length of this object is measured to be equal to l.
00:20
We call this the proper length because it's the length measured in the reference frame where the object is at rest.
00:31
And this proper length is the greatest possible length.
00:35
Measured by any observer.
00:37
Now consider that we have a second observer, according to whom the first observer is moving with a certain speed, let's say v.
00:50
This is the s prime observer.
00:53
Now in this observer's reference train, the object is also moving with the speed v...