Recent content by apoptosa

.. {Erf}(x)\equiv \frac{1}{\sqrt{2\pi }}\int_0^x e^{-t^2} \, dt \text{Let} t\to -u s.t d (-u)=-\text{du}=\text{dt} u_2=-t_2=-(-x)=x; u_1=-t_1=0; \text{Erf}(-x)=\frac{1}{\sqrt{2\pi }}\int_0^x e^{-(-u)^2} \, d(-u) \text{Erf}(-x)=-\frac{1}{\sqrt{2\pi }}\int_0^x e^{-u^2} \, du i.e...

Hey there, I recently solved for the resonant modes in a 3d metal box. Thats nice, but I was wondering about how to actually excite the modes (its a sealed metal box) Supposing I actually excited these modes by shining incident em radiation such that a portion [of the incident wave]...

Just a little tip, you might want to work through things in algebra before you number plug :)

For the first: If you don't need the height then why are you calculating it ? Try Vf = Vi + at Where t would be time of flight & Vf,Vi final and initial velocity respectively