# Recent content by xenogizmo

1. ### Matrix Basis and Dimension!

Hey Everyone, I have this question on my assignment that's confusing me, I think I have the logic right, but for some reason Im getting the wrong answer.. Anyways the question states: If S is the subspace of M5 (R) consisting of all matrices with trace 0, then dim(S) = ? Now, I know...
2. ### Linear Algebra: Projection Theortical Problem

Hmmmm, yes you are right, if it is in the plane it's impossible. Im really sorry for all your trouble, I really appreciate your help! But assuming V is not in the plane, would it be possible? :smile:
3. ### Linear Algebra: Projection Theortical Problem

That's not really what's being asked in the question, we dont want the projection of A onto V, we just want an a general expression for projecting A on the plane by just adding a multipe of V to it. Any ideas? :frown:
4. ### Linear Algebra: Projection Theortical Problem

Hey Everyone, I have this question that's been giving me a hard time, I dont really know how to do it. "Let A be an arbitrary vector. It may be projected along a direction V on the plane P with normal vector n. What is its image A ?" I know that A + lamda*V = A , and that we have to...
5. ### Optics Problem: What am I doing wrong?

Ideas anyone?
6. ### Optics Problem: What am I doing wrong?

btw, the answer I got when I did this was 2.313x10^8 m there's a hint on that question but it made sense to me.. Here it is just in case: "What is special about the case R2 > n*R1? "
7. ### Optics Problem: What am I doing wrong?

Hey Everyone.. I'm having trouble with this question, I think I have this question figured out but my answer is coming out incorrect... Tell me if there is a flaw in my logic.. question is: "Suppose that a luminous star of radius R1=1.74×108 m is surrounded by a uniform atmosphere...
8. ### How does that evaluate 1?

How does that evaluate 1?? e^(2*pi*i)
9. ### Linear and Angular Momentum Problem

Hey Everyone, I have this physics problem, and I'm not really sure how to solve it using linear and angular momentum, I know it can be solved otherwise in different methods, but I'm interested in this one.. The question is: "A bowling ball is given an initial speed of 5 m/s on an alley...
10. ### Is binding energy positive or negative?

Hey Everyone, This is a quick question.. is binding energy positive or negative? I'm pretty confused now, because in some places the definition was: The energy released when the nucleus of an atom is formed by combining neutrons and protons. And in other places: the energy required to...
11. ### Quick Matrix Clarification

That makes sense! thx
12. ### Quick Matrix Clarification

Hey guys, This is just a quick question.. I have a question on my linear algebra assignment that I dont understand.. What does it mean when you're given a 2x2 matrix M and told to "find formulas for the entries of M to the power of n, where n is a positive integer" The assignment is about...
13. ### Polarized Light

In the chemistry lab, the demonstrator had a black picture, that showed a different picture under normal light and polarized light
14. ### Polarized Light

hey guys I think I might have said the question in a wrong way or something.. the phenomenon i'm talking about is not 3D.. :frown: It's just a 2D picture, only difference than any normal picture is that it ONLY appears under polarized light.. Helpful? :confused:
15. ### Polarized Light

No, not really.. It's like a picture, if you look at it with the naked eye, you see nothing, but if you shine polarized light on it you see the picture.. What's the explanation of this?