Recent content by R3DH34RT

Oh yes, I forgot the name, but I remember that equation... Thanks... :)

By the way, I found that t' = 6.667 e1 + 47.14 e3 Is that OK? Thanks...

I am still confused. Can you give me an example please? Let's say e1' = (2 e1 + 2 e2 + e3) /3 e2' = 1.4142 (e2 + e2) e3' = 0.4714 (e1 + e2 + 4 e3) and I have a vectro t = 10 e1 + 10 e2 - 20 e3 Can you transform it to e1', e2', and e3'? I have done that, but when I rewrite it back to the...

If we want to transform vector A from cooedinate ei to ei', then this formula occur: Aj' = aij Ai But I have a question, if I have found all components of Aj', then I want to transform it back to Ai, what should I do? I have tried Ai = aij Aj' but it won't give me the same number. Thanks...

I've never heard about that. Can you please explain a bit? Thanks...

But, with that, there will be only 2 terms left, instead of 4... Is that true? And what will happen with the other 2 terms? I'm confused. Thanks a lot...

delta x (a x b) = (b . delta) a - b (delta . a) + a (delta . b) - (a . delta) b all terms are in vectors, so delta x means curl. Can anybody prove that? Because I have tried to prove it, but it keeps failing. Please help me to figure this out... Thanks a lot...

Hello...? :(

Hello...? :(

I'm sorry, the question should be like this: New right hand coordinate axes are chosen at the same origin with e1' = (2e1 + 2e2 + e3)/3 and e2' = (e1 - e2) x 1.4. Express e3' in term of ei (not e1, sorry...). If t = 10e1 + 10e2 - 20e3, express t in terms of the new basis ek'. Express the old...

for number 3, I've found the e'3 vector which is 1/3 V2 e1 + 1/3 V2 e2 - 4/3 V2 e3, here V means the square root. But I still don't know how to make it to ei part...?

I calculated the cross product of b x c, buat I don't know what is the meaning of "projection to plane A" But for number 3, I can't figure out the meaning. Can you please give a hint? Thanks...

Hi, can anyone help me with the other question please...? I am so depressed... :( Need some hints... Thanks...

Hi... can anyone olease help me...? :(

Thanks, haushofer, you are very helpful! I'll try and hopefully I'll find the answer... But there are another problem that seems complicated, I found these on general textbook and I can't understand how to solve it. Can you please also help me? A.> n = 0.5i + 0.5j + 0.7071k is the...