- #1
ForTheGreater
- 22
- 0
Homework Statement
It's just an example in the textbook. A vector in cylindrical coordinates.
A=arAr+aΦAΦ+azAz
to be expressed in cartesian coordinates.
Start with the Ax component:
Ax=A⋅ax=Arar⋅ax+AΦaΦ⋅ax
ar⋅ax=cosΦ
aΦ⋅ax=-sinΦ
Ax=ArcosΦ - AΦsinΦ
Looking at a figure of the unit vectors I get it. At the same time I just don't understand why ArcosΦ isn't enough to get the magnitude of the Ax component.