00:01
Hi, in this question, the force f vector is given as 4i vector plus 12 j vector minus 3k vector.
00:23
This is the force which is supplied at the point b.
00:27
We need to determine the moment of this force about an axis extending between a and c.
00:36
First of all, let us write down the position vector for the point b.
00:41
The point b position vector, b is given by 4i vector, that is in the x -axis it is 4 feet, plus 3 j vector.
01:00
In the y -axis, it is 3 feet.
01:03
And in the x -axis, it is minus 2k vector in the negative direction, negative is the direction.
01:12
So this is the position vector for the point b.
01:16
Now let us find the moment of this force about the axis ac about the line joining ac.
01:29
Let us find the moment of this force about the x axis...