00:02
Beginning by drawing a diagram.
00:07
It's interesting how they write these real -world objects into the drawing, like this pencil or whatever's there, is written in, drawn in, but it really doesn't matter to the problem.
00:28
I guess it just gets you used to seeing the real -world objects.
00:45
So drawing, drawing, drawing.
00:49
Y, z.
00:53
And we've got 60 here.
00:57
We've got 60 here.
01:03
And we've got 135 here.
01:14
Then we've got 60 here.
01:21
And this one is shown with its projection onto the xy plane.
01:31
This is 20 degrees.
01:41
And i think that's everything.
01:43
So let's go ahead and get f1.
01:48
On the x, y plane is just going to be, let's see if 60's up there, then we need sine of 60, which is the square of 3 over 2, i believe.
02:18
I'm just going to use a calculator.
02:29
Newton's.
02:33
F1x.
02:36
Now we just need to multiply that by the cosine of 20.
02:55
So the cosine of 20, 325 .5 newton's.
03:09
F1y is just f1 on the xy plane times the sign of 20.
03:28
118 .5 newton's and f1z is going to be 400 cosine 60 which is just going to be half of 400, which is 200.
03:54
Now, that one is definitely in the positive direction.
03:58
X is in the positive direction.
04:02
Y would be in the negative direction.
04:07
So, i need to put a negative in front of y.
04:12
Z is positive, x is positive, y is negative.
04:19
Okay, f2.
04:21
This is a little more straightforward.
04:27
The x direction is just 60.
04:30
So this is just going to be 500 cosine 60, which is 250.
04:41
F2y is also 60.
04:50
Also 250 newton's, and f2z, 500.
05:06
Right, okay, cosine of 135.
05:12
This is going to give us a negative answer.
05:19
It can be negative square to 2 over 2, negative 353 .6, noons, 0 .6.
05:34
Okay.
05:40
So let's remind myself a what i was doing.
05:46
Now we need the resultant force.
05:49
So the resultant force, frx is going to be just add the two together.
06:03
346 .4 plus 250...