00:01
All right, so we always start by making a drawing.
00:07
There are two forces with the same.
00:13
No, they're different angles.
00:20
I'll label the angles as theta and phi, f1, f2.
00:39
So we're told that f1 is 30 pounds.
00:44
What in the world? why isn't it writing 30? f2 is 40 pounds.
01:02
Needs to have a magnitude of 60.
01:14
And it needs to be directed along the x -axis.
01:22
So the sum of the forces in the y direction would be zero if it's directed along the x -axis.
01:37
So that's going to be f1 sine theta minus f2 sine phi.
01:53
The sum of the forces in the x direction would be 60, which is going to be f1 cosine theta plus f2 cosine phi.
02:21
All right.
02:26
So we just need to figure out theta and phi.
02:37
What happens if i divide the first equation by the second equation? no, that's not going to make much sense.
02:51
All right, so what i'm going to do is i'm going to put them into a calculator...