00:01
Says that horse a is twice as far from horse b is from the center of a merry -go -round.
00:05
So if you kind of think of here's horse b and then here's horse a out here, which is twice the distance, then it says that horse a has to travel twice as fast as horse b, is that true or false? and so here's what we have to think about.
00:25
They're making the same revolution, right? they're going around 2 -pi in the same amount of time.
00:31
So if they're traveling the same distance, then they would be going the same speed.
00:36
If they're traveling more distance and they're going, they're going to have to go faster.
00:42
Because the time is the same.
00:44
So distance is velocity times time.
00:45
That's a physical form that you probably know.
00:47
The time is the same, then the distance over the velocity has to be the same.
00:54
Now, thinking about distance, the distance is actually going to be the circumference, right? so it's going to be two pi times the radius for each of them.
01:02
For part for b, if that's r, let's say, then that's just 2 pi r for b.
01:08
That's the circumference of b.
01:10
For a, then, it's actually twice that...