Recent content by infraray

How is the bullet-wood problem different in setup if: a)the bullet stops in the wood b)if the bullet goes through the wood? Is it that (a) would be an inelastic and (b) would use conservation of momentum? Other question is how can energy loss by heat be calculated by this type of...

I figured it out. I need to take the conjugate of the second vector. This is sure going to get confusing with Quantum Mechanics!

I'm going nuts here and I can't figure this out. I have two complex vectors: A=(1+i)x + (1)y +(i)z B=(4-i)x +(0)y + (2-2i)z If I do the dot product of these on my calculator I get 1 + 7i, however when I do this by hand I keep getting 7 +5i. What am I doing wrong? When figuring this out by...

Yeah, that was exactly what I was wanting to know. I don't know why I was thinking it was more difficult. Thanks.

If I have something that can lift 400lbs. How would I determine how much pressure this could generate if used in a punch type situation. I would be punching a hole.

Ok, after some tinkering I was able to get: k\frac{dx}{dt}x = m\frac{d^2x}{dt^2} Since it doesn't appear to be able to be put into a 1st order equation I assume I am out of luck with seperation, or am I? Sorry, but I'm not sure what x=0, x=k/m tells me about the equation. Are they linear...

I'm given F=kvx. I need to find x(t), k is a positive constant, and the particle passes thru the origin with speed Vo at time t=0. I start by rewriting the formula as such: dv/dt=k*dx/dt*x I am confused now though because I now have dv,dt, and dx. I assume I need to get everything in...

Just wanted to say thanks for the help. Your pointers helped.

But shouldn't this be with respect to x instead of t as you have shown as I am looking for F(x).

Alright, I have a specific homework question with regard to attaining more skills with problem solving. I have been given this specific problem: xdot=bx^-3 b is positive constant, find force acting on particle as function of x. I am not sure where to even start. I know F = ma =...

You are right, I was going from memory and it should not have been F(x) but Fx which is really F. This makes it significantly easier. I still struggle a bit with understanding the role of integration and differentiation and deriving solutions to problems. Is there a good reference (book or...

I am taking a senior level analytical Mechanics course, which is very math based. I am having major difficulty in bridging the gap between what a given problem is asking for and manipulating the problem to solve it. I have had all the necessary math courses and did respectable, but now I feel...

Using the hydrogen atom as an example, what exists between the electron and nucleus. Is this a cloud of other particles? Is it merely the electron probability distribution? Is this a similar analogy to what exists in the spaces of space? Is it like the idea of Dark Matter? What theories out...

First off I apologize if this is in the wrong section, but I was not certain to where it belonged. If I am given a set of requirements for an e-m wave, i.e.: must contain all following: transverse, 3d, plane wave, propagation vector parallel to (-1,0,1), through plane defined by (1,0,1) and...

With regard to lecture notes on the web, look into MIT's OCW(OpenCourseWare) site which has prettty much everything from classes offered there. This really helped me out in augmenting my studies. http://ocw.mit.edu/index.html