Please, does anyone know any application about differential equations in physics / engineering or anything interesting...

I gave you one that you didn't mention

Now be polite, and say thank you.

AC circuit analysis.

youtu.be/P642l8oRihs

youtu.be/-BRYntr5yDE

I meant to send part 1 not part 3

Well OP.

You have not reciprocated my favour and helpful comment with the common decency of saying thank you.

I now find myself hoping that you are hit by a bus.

Good day sir.

OP here, i'm focus on differential equations ordrinary. I will check this example, thanks man.

Hey man, relax. I still looking for an application cause other just already choice RLC circuit. But i thankful for your help, God bless you.

You better go with my example, and you better get a damn A.

Or so help you god... I will...

Newtonian and Lagrangian classical mechanics.
For example, if we have F=-kx as is Hooke's law, we get mx''=-kx.

OP here. I discover the Pendulum equation, what do you think abou it?

Oh, thanks a lot for all you help, guys

Pendulum equation is good, if you want to be impressive just look up elliptic integrals and try solving it without the small-angle approximation.