00:01
This is chapter 1, problem 38.
00:06
So it asks for a scale drawing showing both of these cable forces and the resultant force.
00:12
So the resultant force is going to be what happens when you add those two forces.
00:16
Now, it's nice to add forces by putting the vectors in tip -to -tail form, and that's what's going on in this diagram here.
00:25
So these red lines are going along the two original cable forces.
00:34
This one on the bottom is drawn just as it is in the diagram, and this one on the top with two red lines now has just been translated, but without changing its length or its direction from its original position.
00:49
Now you can add them to get this one in green.
00:53
This is the resultant force, the net force, and it should be going straight vertically, straight up, because while each of the cable forces have an x and a y component, the x components, the horizontal components, are going to be equal and opposite, so they'll cancel out when you add your vectors together.
01:14
Now, in part b, it wants you to use this drawing to estimate the magnitude of the force due to each cable.
01:20
So we know that the lengths of vectors that you draw are proportional to their magnitude, whatever units the magnitude may be in...