00:01
Hello, so this is the diagram representing the question, okay? we're trying to find the tension, okay? so you're going to be finding a moment about b.
00:21
You cannot find it about the a because they said that the false day is zero, okay? so it means that the dot is going to be turning about b now.
00:33
So to find the moment about b, let's look at the clockwise, so what we mean is that the clockwise.
00:39
There's a black one here.
00:46
Clockwise moment should be equal to antichlockwise moment.
01:07
So let's first look at the clockwise.
01:14
So for the clockwise moment that's going to be the weight of the door which is 500 times the perpendicular distance between that.
01:27
Right? so there's the door.
01:29
That is the weight of the door and the distance is going to be up to this point.
01:34
This distance is 2.
01:37
So that's just going to be times 2.
01:43
So that is that for clockwise.
01:44
There's a bit anti -clockwise.
01:47
So this tension has two components.
01:52
Let me use different color to show that.
01:54
Okay.
01:55
So there's a component in this way.
01:58
Right, let's say t v.
02:02
And then there is a component this way, which is let's say t h.
02:08
That's a horizontal component and a vertical component.
02:11
And we need to account for both.
02:14
So for the vertical component, if you use trick, you see that that's just going to be.
02:19
So t v is going to be t sine theta.
02:25
And then t h is going to be t cost data.
02:32
Okay...