Recent content by heycoa

Hi, thanks for taking the time to read my post. Yeah I know about band theory, and if I remember correctly there is a valence band and a conduction band and the Fermi level lies somewhere in between. I do not know where the free electrons are. I also do know the definition of the Fermi level...

Hello, Are the electrons at the fermi level regarded as the "free electrons" of the metal? Also, how does one go about calculating the Fermi level? Is there an equation or is it experimentally determined? *Bonus question* Electrons that undergo phonon exchange and pair up are called...

I guess I just don't understand what K is. In my case, is K the slope of d(omega)/dt? So do I have to take the derivative of d(omega)/dt and then calculate the slope at each point?

Thank you very much for the response! But I'm not sure I understand. What is N here?

Hello, I am trying to program a double pendulum via the 4th order Runge-Kutta method and I cannot seem to be getting the right output. At first I used the Euler-Cromer method, but now I am aiming to make it more accurate. Homework Statement I have the equations of motion: d(omega)/dt and...

Tiny-tim, thank you very much for the response. When you say they want me to do it quickly using vector equations, are you saying that m*(d2s/dt2) =m*sqrt(d2x/dt2)+(d2x/dt2)) is incorrect? I'm not sure how else I can show what s'' equals. I am thinking that the tangential force is equal...

Homework Statement a) Prove that m (d^2s/dt^2) = Ftang, the tangential component of the net force on the bead. [hint] one way to do this is to take the time derivative of the equation v^2=v(dot)v. The left side should lead you to (d^2s/dt^2), and the right side should lead to Ftang. b)...

The force equation looks like that of a spring. But as far as I can remember, you go from potential energy to force by multiplying the force by the distance. This problem just seems weird to me.

Homework Statement Write down the Lagrangian for a one-dimensional particle moving along the x-axis and subject to a force: F=-kx (with k positive). Find the Lagrange equation of motion and solve it. Homework Equations Lagrange: L=T-U (kinetic energy - potential energy) The Attempt...

no you're great! :)

Ok excellent! So I apparently need to read these questions more carefully and define my coordinate systems. I can't thank you enough for taking the time and having the patience to work with and follow up with me. Thank you very much

for v2 i get 2*v0(x hat) + v0(y hat) i calculated the magnitude to be v2=v0*sqrt(5) does this appear to be correct?

Then it should be minus the second term (-m*v0*yhat), right?

well p2=v2*m and when i solve for v2 i get 2*v0(x hat) + v0(y hat)

so the direction of p0 is in the x-direction, and p1 is in the y-direction?