1:43 AM
2

The lagrangian is always phrased as $L(t,q,\dot{q})$. If you magically knew the equations $q(t)$ and $\dot{q}(t)$, could the Lagrangian ever be written only as a function of time? Take freefall for example. $$y(t)=y_0 + v_0t -(1/2)gt^2$$ $$\dot{y}(t)=v_0 -gt$$ Can the Lagrangian now be written a...

1 hour later…
2:58 AM
1

Despite being presented as one of the fundamental results of Quantum Mechanics in practically every textbook, I realized this morning that I don't understand deeply how Quantum Mechanics predicts the double slit experiment. The best explanation I have found seems to be closely related to the path...

10 hours later…
1:19 PM
2

According to Einstein's general relativity, massive bodies should cause gravitational redshift. How accurately has this been measured?

4 hours later…
5:27 PM
4

I know that friction is cause by the electromagnetic force between electrons from 2 contacting surfaces but how come it only applies to physical contact with a solid surface?