00:01
This problem is basically simple if you get the geometry right.
00:06
So we have this spherical cap.
00:10
So it's kind of like a spherical cap here.
00:13
And there's a ball hanging down here from the center.
00:17
And this whole thing is rotating.
00:19
Everything is rotating around this axis, which means that this ball wants to swing out over here.
00:25
And then when this ball touches this here, i guess it makes some electrical contact and then slows things down.
00:32
So the faster this thing is spinning around, the higher this, if it's not spinning around at all, the ball is going to be just down here.
00:40
If it's spinning around, you know, it's going to start coming out here, and the faster and faster this is swinging, the greater and greater this angle will get.
00:51
Now, we're told that this radius here, the length of this string from the point of attachment to the ball is, 0 .3 meters.
01:03
The radius of this cap, this spherical cap, is also 0 .3 meters.
01:10
And so we have, this is 0 .3 meters.
01:15
This is 0 .3 meters, because that's the radius still.
01:20
And then this is 0 .3 meters.
01:22
So we have an isosceles triangle there...