Recent content by CrosisBH

I'm just starting my undergraduate Quantum Mechanics course. I had a homework problem to show that \Delta S_x = \sqrt{\langle S_x^2 \rangle - \langle S_x \rangle ^2} = 0 , S_x being the spin in the x direction. I managed to solve it, but the physical interpretation is confusing me. If I...

Note this is in our Lagrangian Mechanics section of Classical Mechanics, so I assume he wants us to use Calculus of Variations to solve it. The surface area is fixed, so that'll be the constraint. Maximizing volume, we need a functional to represent Volume. This was tricky, but my best guess for...

I changed how the potential is handled with a simple function def potential(x): if (abs(x)<=1): return 0 else: return V0 So now my stepping function is Which surprisingly yielded the same plot. I will look into starting at x = 0. Will come back with updates.UPDATE: I...

Every one of those would represent the first point in the list, corresponding to the very left of it's domain. wavefunction[0] and x_axis_wave[0] correspond to the their function at -1, while with potential and it's domain's 0th element is their function at -3. I have constructed the lists so...

The book's procedure for the "shooting method" The point of this program is to compute a wave function and to try and home in on the ground eigenvalue energy, which i should expect pi^2 / 8 = 1.2337... This is my program (written in python) import matplotlib.pyplot as plt import numpy as...

This is in python: #ELECTRIC POTENTIAL from mpl_toolkits.mplot3d import Axes3D from matplotlib import cm import numpy as np import matplotlib.pyplot as plt dx = 0.1 dy = 0.1 xrange=np.arange(-1,1,dx) yrange=np.arange(-1,1,dy) X,Y = np.meshgrid(xrange, yrange) max_dV = 10e-5 blockRadius = 3...

Okay it turns out I was making a fatal error. These damn negative signs. The second differential equation yields $$\frac{-v_t^2 \ln\left(\frac{v_t^2-v_f^2}{v_t^2}\right)}{2g} = -y_{max}$$. I forgot cancel negatives and dropped it when i subbed y_max. A lot of canceling yields...

I chose coordinates where down is positive. So the force going up is $$F_{up} = mg - cv^2$$ $$a = g + \frac{c}{m}v^2$$ $$a = g + \frac{c}{m}v^2$$ $$a = g \left(1 + \frac{v^2}{v_t^2}\right)$$ $$a = \frac{dv}{dt} = v\frac{dv}{dy} = g \left(1 + \frac{v^2}{v_t^2}\right)$$ I used normal separation of...

Damn, that was the problem! I went ahead and each 6 arrays and added their 0th component by hand, and now the plot is display (roughly) what I need! Just need to clean it up a bit.

import matplotlib.pyplot as plt import numpy as np #constants and conditions initial_velocity = 49.1744 #m/s, book has 110mph velocity_angle = 35 * np.pi / 180 #coverted to radians because numpy only likes radians gravity = 9.8 #m/s^2 dt=0.1 windspeed = 4.4704 #m/s book has 10mph #calculating...

Sorry I confused myself when making this thread. I was tired. I should also specify the level of the course too. Quantum Physics I is the course name, but the other course is Classical Mechanics I. As for textbooks, I haven't figured out my Quantum book but I know for Classical Mechanics it's...

They simply said "You're going to have to do this if you want to graduate in 2021" They're the one that suggested I do it.

Hello! I'll be entering my second semester of my junior year of my Physics Degree. My uni doesn't have a bad physics program, but it's really small so I have to take my upper level classes as soon as they're offered or I won't take them for another 2 years or so. They are on a cycle so I will be...

So I'm reviewing old lectures to prepare for an exam soon. This is about polarization. E fields, D Fields, etc. My professor labeled this diagram like so. The figures my professor drew are cavities in a dielectric if you can't read her handwriting. However, I can't seem to figure out why the...

From Griffiths E&M 4th edition. He went over solving a PDE using separation of variables. It got to this ODE \frac{d}{d\theta}\left(\sin\theta\frac{d\Theta}{d\theta}\right)= -l(l+1)\sin \theta \Theta Griffths states that this ODE has the solution \Theta = P_l(\cos\theta) Where $$P_l =...