00:02
This question, you look at momentum forces, basically, torques, right? so let me copy down the diagram from the question, which is like this.
00:13
So this is what we're looking at.
00:16
So you have two forces, right? one's here, the other is here, right? and you're basically asking about forces about the b pointer, which is right here, right? so first, what's the momentum of this force, of this force about, this point.
00:31
Well, what you need to do is just to find the distance, well, the distance, right, between this one, i found the distance here.
00:40
So the moment is simply given by 20 kilo newton times that distance, right? you can work out the distance.
00:48
So this is from here, right? given the lens you should be able to work up that distance and that distance should yeah you need to work it out anyway yeah there's something you need to work out the distance you have something you need to work out but i think you can see that this is 30 degrees right that's 30 degrees so distance can it's just it's basically given by it's basically giving time it's basically giving by, you know, so you look at this point, it takes some, just some geometric consideration to work out the distance, right? you see that this 30 degrees and this must be 30 degrees.
01:36
So this one must be the distance from here to here, multiple sign 30.
01:44
So i will multiply so times sine 30 degrees, and then you have to multiply this distance, which is four meter plus this little bit, right? so it's times four meter plus a little bit here.
01:59
This little bit is actually clear, which is actually half that this, always says tangent of this 10 meter times tangent of 30.
02:11
So that's the torque generated by the force, the 20 kilo -newton force.
02:18
And you can work out in a similar way.
02:21
What is the fourth gene, right about this.
02:23
400, 400 kilo, nudes.
02:25
So that's given by 400 kilo and multiplied by.
02:29
First, the distance, of course, found the, the distance now is here, right? you need multiply this distance.
02:35
So that's the same as this one, right? so that distance, how do you find that distance? well, we already found out this distance, this distance, right? from this distance, we can find actually what this distance could be, right? that is this times cosine, right? so i will call actually this part, i will call it d because we're going to use it.
02:58
So it's going to be given by d times...