00:01
In this exercise, we have two vectors, g that is equal to 3i plus 4j plus 10k newtons, and h that is equal to 1i plus 4j neutrons, where i, j, and k are the unit vectors in the directions of the x, y, and z axes.
00:20
And we had to find what is the component of g along the vector h.
00:28
So remember that the component of a vector a along vector b is equal to the dot product between a and b divided by the magnitude of b.
00:48
So in our case, the component of g along h will be the dot product of g along with h divided by the magnitude of h.
01:03
Remember that the dot product is defined as the sum of the multiplication of each component.
01:12
So this is gz times x times hx plus gy times hx plus gy times hz, divided by the magnitude of h, which is the square root of hx squared.
01:34
Plus hy squared plus hz squared.
01:41
And now let's calculate everything...