00:01
Hello, welcome to this lesson.
00:02
In this lesson we have two forces that forms an angle of 68 .5 degrees.
00:08
The forces are 37 .8 pounds and 53 .7 pounds.
00:13
We are looking at the magnitudes of the resultant force.
00:18
So with this, we have this side facing the angle format a as a.
00:26
This side is the b side is the c.
00:35
So use the cosine rule where if you have, you are looking at a squared is equals to b squared plus c squared minus 2ac.
00:56
Then cos of the angle a, cos of the angle format a.
01:02
So now we have a squared.
01:04
That is the square of the force, the resultant force that we are looking for.
01:12
Okay, that is equals to b squared.
01:14
So here we have 53 .7, 53 .7 squared plus 37 .8 squared minus 2, then cos of 68 .5 squared...