Recent content by llello

Tell him to take physics again because he clearly missed the point. Yes, 1000 watts is 1000 watts, but a heater turns (most) of that energy to thermal energy whereas any other device converts some of that energy to some meaningful work. But you want an example. So let's say we have a (massless)...

Ok, solved the problem. It was really stupid too. I was throwing "0" into the subroutine but i had to define variables that are zero to put into the code. Rookie mistake.

Hey folks, I'm having an issue using a routine from the netlib that is supposed to calculate eigenvalues and eigenvectors. The canned routine can be found here: http://www.netlib.org/seispack/rgg.f I want to find the eigenvalues of a matrix (a more complex hamiltonian), so for my simple...

Thanks for all the tips folks.

Ok, I'll add that one to the list. I'll also peruse my copy of Fowles and Cassiday to see if there's anything helpful in there.

Unfortunately my undergrad mechanics completely omitted Lagrangian mechanics and everything thereafter, so this is the first time, heh.

Thanks Fred, I'll hit the library up tomorrow and look for those :)

Sounds about right then. If I get 6 hours of sleep I consider myself lucky.

The book we're using for mechanics is "Theoretical Mechanics of Particles and Continua" by Fetter and Walecka. I've never had as much trouble understanding physics as I am now. I am absolutely confounded when it comes to Lagrange multipliers, Euler angles (and other rigid body stuff) and...

Well f^{-1} : B \rightarrow Y So let x be in B as you said. Now f^{-1}(x) is an element of Y provided that there is some y in Y such that f^{-1}(x) = y . This is where you need to use surjectivity. Hope this helps.

Just an fyi, in high school I absolutely hated math. Nothing really "clicked" until I hit calculus. At that point, the reasons for all previous work became obvious. Maybe check out some lectures on youtube before deciding you can't put up with the math.

So in part a, you seem to have a "g" floating around. It looks like you assumed the final potential energy is gravitational. The final potential energy should be for electric charges, neglect gravity.

Any time you prove subset relations, you have to show that any element of the subset is an element of the parent set. Let x be an element of the subset, show it is in the parent set.

So a general way to go about kinematics problems: - Note that in all of the equations only 5 variables appear: t, \Delta x, v, v_o, a - These represent time, displacement, final velocity, initial velocity and acceleration. - Each individual equation only contains 4 variables. - Generally you...

Kinematic equations are listed here. http://www.physicsclassroom.com/class/1dkin/u1l6b.cfm Its like the 2nd hit on google when you search for it.