Vector and Cartesian Coordinates (URGENT PLEASE HELP)

[UrgentAndrey]

Hello everyone,

 

Great forum, wondering if you can help me with a problem. Ive attached the question along with my calculations so far.

 

Any help would be fantastic

[ajb]

Your equation 2 is correct, but how you got to it is not. You cannot divide by a vector in the way you have.

 

I think all the question is asking you to do is work out the scalar product in 2d. The answer should be just a number.

[UrgentAndrey]

Your equation 2 is correct, but how you got to it is not. You cannot divide by a vector in the way you have.

 

I think all the question is asking you to do is work out the scalar product in 2d. The answer should be just a number.

 

Hi ajb,

 

So using the information I have, how can I obtain a value for V^mu ?? Is there something simple I'm missing?

 

Hi ajb,

 

So using the information I have, how can I obtain a value for V^mu ?? Is there something simple I'm missing?

 

It simply isn't a case of:

 

V^ mu = V^nu is it?

 

In which case V^mu = (3,1)

[studiot]

I am unsure of your convention.

 

What are you signifying by upper and lower are they transposed?

[UrgentAndrey]

Well according to ajb it looks as if I have to find the scalar product in 2d, given the information attached to my first post.

 

However that is as far as I can get. What I meant in the previous can be seen in the attachment.

[studiot]

[math]{V^\mu } = {V_\upsilon }[/math]

 

 

Well that wasn't what you said in the first post, which was why I asked about your notation.

 

Are you talking about contravarient and covarient or column vectors and row vectors?

 

To premultiply by the square matrix you need a column vector.

Edited July 19, 2012 by studiot

[UrgentAndrey]

Sorry thought I wrote that

 

Yes I think so (contravarient and covarient) , all I have is the information I've put so far. I'm unsure as to my next step?

Edited July 19, 2012 by UrgentAndrey

[studiot]

Look here under the section marked Euclidean Plane.

 

There is an example calculation of the type you are trying to perform.

 

http://en.wikipedia.org/wiki/Covariance_and_contravariance_of_vectors

[UrgentAndrey]

So using the link you gave me, is this correct?

 

V^mu . V_mu = 1