00:01
Hello, here two forces are acting on the object.
00:05
Vector a is 3 newton's and that is directed to the north, so let's illustrate it.
00:26
B is 4 newton's and it's directed 30 degree north of east.
00:47
So we have to find the result on force using parallelogram and polygon method.
00:55
Let's do this, so here first we'll use a parallelogram method.
01:08
Let's sketch the total sum which will label as a vector r.
01:21
So that's the diagonal of the parallelogram.
01:26
And here let's find this r.
01:31
R will use a coordinate approach to calculate the length of r.
01:41
This length is square root of square, sum of squares coordinates of vector r.
01:47
R x here is b, cosine of 30, which is 4 newtons times cosine of 30 degree...