Recent content by nicknaq

So I was studying some physics, and I keep encountering how many things depend on the frame of reference. For example, kinetic energy and momentum. My question is if there is an absolute frame of reference? Can we define one? I remember reading somewhere that the absolute reference...

bumpidity

Homework Statement Recent studies have raised concern about `heading' in youth soccer (i.e., hitting the ball with the head). A soccer player `heads' a size 4 ball, deflecting it by 38.0 deg, but keeping its speed of 19.60 m/s constant. A size 4 ball has a mass of approximately 0.302 kg. What...

I GOT EVERYTHING EXCEPT FOR 2B and the last part of 3b (sliding it over) can someone help?? (maybe number 4 too as I'm not sure if I'm right)

Thanks Outlined. If anyone else has any input that would be greatly appreciated!

Help me Understand "Closed Under Addition" and "Closed Under Multiplication" Linear Algebra...matrices...etc Examples would be great. Thanks.

Let T1 be the reflection about the line 2x−3y=0 and T2 be the reflection about the line 2x+5y=0 in the euclidean plane. - first I was asked to find the T1°T2 matrix. I did that. - now I need to find the counterclockwise rotation about the origin of T1°T2 I should use...

I have the answer, but it makes no sense to me. Can someone explain it? QUESTION: Determine if the vector { [1 3 -1 0]^T, [-2 1 0 0]^T, [0 2 1 -1]^T, [3 6 -3 -2]^T } spans R^4 ANSWER: The vectors span R^4. One way to see this is to observe that the matrix A with these vectors as...

Why? And how? Do I simply multiply (1,0) by the matrix given (i.e. cosΘ, sinΘ, sinΘ, -cosΘ)? If so, where does that get me? I'll have a matrix with Θ terms in it. I'll work on this after I get (a) The three rules are: 1. It must go through the orgin 2. closed under additon 3. closed under...

:smile: Hey everyone! I'd love if you could help me on these couple problems. Homework Statement I have attatched a PDF file (don't worry, it will only take you an instant to download - it's just a single page). I'm having problems with numbers 2 and 4. Number two is about reflections about...

well.. projv(w) would mean the projection of w on v. For example. d is direction vector n is normal ...anything else you need to know?

So if I want to stay away from calc, is the best way to prove distance=0 by simply showing the projection is zero?

Does that involve calculus? If so, it's really not necessary.

Would it entail that the lines are orthogonal? For example, the projection of x=0 on y=0 would be zero since y=0 has no component in the direction of x=0. If that makes sense?

Proj of v on normal.