00:03
Okay, ferris wheel is 20 meters in diameter.
00:07
It's bordered from a platform that is one meters above the ground.
00:11
So here is our ground.
00:14
We're going to make a platform that's one meter above the ground.
00:17
And we're going to make a ferris wheel.
00:20
And that's 20 meters in diameter.
00:27
So if we picture kind of making a graph, we're going to do time versus height.
00:35
So at time zero, we're one meter off the ground.
00:42
It takes us eight minutes to do one full revolution.
00:49
So it takes us eight minutes to go all the way around to get back to the beginning.
00:54
So eight minutes later, we're back down at the bottom.
00:58
So it takes us four minutes to get to the top, which is 21 feet high.
01:03
So our lowest we go is one meter, not feet, meters.
01:07
And the highest we go is 21 meters.
01:10
So the halfway point between 1 and 21 is 11.
01:14
That is our midline.
01:18
And it's going to take us eight minutes to go in one full turn all the way around the ferris wheel.
01:26
So we start off at 1, go to a high of 21, and we come back to 8 or come back to 1 in 8 minutes.
01:35
So here on our graph, our midline is at.
01:38
At 11, which means our amplitude here is 10, and it's upside down...