00:01
In this problem, all we're supposed to do is draw the free body diagrams.
00:07
So let's go ahead and do that.
00:10
So i've drawn a diagram here for the beam.
00:13
So as far as the forces on it, so we know that the whole length is six meters.
00:26
So presumably there's going to be some kind of m .g here that represents the weight of the beam.
00:34
They didn't say anything about that, but it's reasonable to assume it.
00:39
We know that at the pivot, there's going to be two components of force, px and py.
00:48
We could draw that as a single force.
00:52
And then coming down here at two meters, we have this force, which points downward.
01:09
And we know that one's 26 kilonutons.
01:14
We have a force f here, if we don't know.
01:21
And we have a tension in the wire.
01:27
Okay.
01:28
So, in fact, if you take a good look at this, we have four unknowns, t and f and both components of p...