00:01
In this problem, we have been asked to use the parallelogram rule to find the magnitude of the resultant for the two forces shown in the figure.
00:09
So if we have two vectors p and q and the resultant of those two vectors is the vector r, then by the parallelogram rule, the magnitude of this vector r will be equal to square root over the magnitude of the vector p squared plus the magnitude of the vector q squared plus two.
00:31
2 times the magnitude of the vector p times the magnitude of the vector q times cost theta, where theta is the angle between the two vectors, p and q.
00:41
So in this case, let us note that the first vector is 18 pounds, so that means the magnitude of the vector p will be 18.
00:48
So we have 18 square.
00:50
And the second vector is 6 pounds, so the magnitude of the vector q will be 6.
00:55
So we have 6 square...