Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming tools. My go-to platform is Web VPython (glowscript.org).
Outside of RU-vid, I'm an undergraduate physics faculty and a physics blogger (at WIRED www.wired.com/author/rhett-allain) and Medium (medium.com/@rjallain).
Previously, I was the science advisor for Discovery MythBusters and CBS MacGyver.
Sir, i am afraid you are simplying a bit. You have external forces from the lane. Can you please do the whole problem from release to impact with respect to angular momentum, cg displacement and rg values?
Here's one for my second semester of classical mechanics. ru-vid.com/group/PLWFlMBumSLSYSabN1STpVhYM6eCLwg_gp I'm teaching the first semester in the fall, so there will probably be a new playlist.
Love the orbital tutorials you've done! Dunno if you're interested, but a slightly-in-depth look at the working of the rotational matrix that can turn a simple "2D" elliptical orbit points into one correctly rotated in 3D space to correct for inclination, argument of periapsis and longitude of ascending node. Kinda crazy to me you can put a bunch of sins and coses and 0s/1s and bam, its got all the correct rotations it should have.
Good presentation, but there are some errors. Probabilities of a wave function (in both cases, superposition case and single eigenfunction/eigenvalue case) were not written properly on the sheets. Where are the integrals? The product of psi*psi must be integrated for a continuous basis in order to obtain physically meaninful probabilities... that's why x=x+delta_x is being used in Python script...
no, the light bulb's resistance increases with temperature - but it's a great object to use so that you can visually see what's happening to the current
We live in a 3d world with a time dimension, so 4d. Let's downgrade that for a minute. We do two dimensions with a time dimension, but we use 3d. Because I suck at math. Let's go with the polynomial that we use to define arcsin, but change it up a bit. x^2-i*2*x*sin(θ)-1 r[1]=cos(θ) +i*sin(θ) r[2]=-cos(θ) +i*sin(θ) f := t -> (r[1]^t - r[2]^t)/(r[1] - r[2]) f(t) = (e^(i*t*θ)-e^(i*t*(π-θ)))/(e^(i*θ)-e^(i*(π-θ))) = (e^(i*t*ln(r_1))-e^(i*t*ln(r_2))/(e^(i*ln(r_1)-e^(i*ln(r_2)) int_0^n f(t) dt = -(r[2]^n*ln(r[1]) - r[1]^n*ln(r[2]) - ln(r[1]) + ln(r[2]))/((r[1] - r[2])*ln(r[1])*ln(r[2])) As you've clearly demonstrated in this video, we divide time up into the cycles that we observe. If we did θ=π/5, it would be a perfect cycle, but our cycles are not perfect. It might be θ=arcsin(3/5). If we observe time by distance traveled, we need to measure arclength from the origin. [t, Re(f(t)), Im(f(t))] x(t)=1, derivative of t is 1. y(t)=Re(d/(dt) (f(t))=Re(-(r[2]^n*ln(r[1]) - r[1]^n*ln(r[2]) - ln(r[1]) + ln(r[2]))/((r[1] - r[2])*ln(r[1])*ln(r[2]))) z(t)=Im(d/(dt) (f(t))=Im(-(r[2]^n*ln(r[1]) - r[1]^n*ln(r[2]) - ln(r[1]) + ln(r[2]))/((r[1] - r[2])*ln(r[1])*ln(r[2]))) int_0^n sqrt(x(t)+y(t)^2+z(t)^2) dt I think this is generalized to all quadratics, but I could be wrong. I don't know enough about either of these subjects to make such a claim. But you get what I mean thought, right? Sorry if my notation is bad. Or I did something wrong, and it confused you.
Thank you! I was trying to get this result myself and every other example of finding a sphere’s I started with the assumption of the I of a small disk, which seemed unfair. This seems much more generalized.
I really like al the what-ifs that you add on the ends of some of the vids. I think seeing how various things come into play and affect the whole is really useful and helpful. 😎
once in electrician shool we switched the rotor of an 3~ motor for an alu can, and it was spinning, cause its paramagnetic, same principe as the ring launcher. very interresting,👍🏼
I love your demos! When I started my physics degree in 1978 this was how we were taught, no computer simulations. We learned by doing - observing - investigating.
