00:01
So the first thing we're asked is to write an expression to represent the number of, varying number of radians that has been swept out since the ride started.
00:08
Well if we know that the angular speed is 4 .7 radians per minute, then we just know that the angle that's been swept out is 4 .7 times t.
00:20
So however many minutes there are, if you multiply that times 4 .7, that will tell you the total number of radians.
00:25
Then if we want to know the height of the ferris wheel, well this is going to be a sine or a cosine function.
00:33
We see that it begins at the three o 'clock position.
00:38
So beginning at the three o 'clock position means that we're not starting at the minimum, we're starting halfway in between.
00:48
So the amplitude, if we see that the radius is 50 feet, that's going to be the amplitude because it can go 50 up and 50 down...