# Transformation of a Vector

1. Feb 2, 2013

### Septim

Greetings,

My question is from the book "Tensor Analysis" by Barry Spain. I am asked to show that how a vector transforms from rectangular Cartesian coordinates to polar coordinates. I have attached the question in jpeg format. I have came up with a solution but the angular component in my solution is r^2 times the angular component given in the book. I have checked some books about this subject and found out that both the solution given in the attachment and I have found exist. I am pretty confused about this and I assume that this book is wrong. I will be grateful if someone can provide some insight.

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2. Feb 3, 2013

Any ideas ?

3. Feb 3, 2013

### mathman

My guess: normalization question. Both answers may be right.

4. Feb 4, 2013

### Ferramentarius

Here is a solution based on using vector u_r = [cos(A) , sin(A)] and vector u_A = [-sin(A), cos(A)] normal to it. Edit: It appears the answer is not exactly the same.

Last edited: Feb 5, 2013
5. May 8, 2013

### Septim

I just saw your post much later but I did not understand your argument.

P.S The link is not accessible.

6. Jun 12, 2013

### Septim

The link was accessible and I saw the solution which is similar to mine though less detail is provided. The two answers differ by a factor of r and I think the solution in the link you suggest is the correct one, since it has the dimensions of acceleration and this is acceleration am I correct?