Recent content by Xsnac

Thanks. Regarding the radial part, it specified it's unit sphere therefore constant, and = 1 so I neglected it.

Homework Statement Compute the flux of a vector field ##\vec{v}## through the unit sphere, where $$ \vec{v} = 3xy i + x z^2 j + y^3 k $$ Homework Equations Gauss Law: $$ \int (\nabla \cdot \vec{B}) dV = \int \vec{B} \cdot d\vec{a}$$ The Attempt at a Solution Ok so after applying Gauss Law...

I would say the independent variable is tetha_0 since for each case we set V and V0 constant.

Homework Statement Homework Equations The one in the middle with cot (big tetha) The Attempt at a Solution I have no ideea how he finds the limiting cases for V<v0; v0<V and for V> v0/sqrt (1-v0^2) . The problem is from Landau course for theoretical physics, volume 2: The Classical Theory...

Returned to school @22 with no high school finished. Now I'm second year undergrad studying physics. Is hard to change your life, but it only gets better. I found this very motivational whenever you feel like what you are studying won't be useful for you:

I don't have 3 hours to format a text... I'm practicing for tomorrow's exam... I put a lot of effort to write the small pieces of latex code in this post aswel. (forgot all the syntax and got to relearn it today..) And I'm looking for some other way since mine I think is a dead-end.

Homework Statement I'm trying to derive the vector identity: $$\nabla(\vec{A} \cdot \vec{B})$$Homework Equations $$ \nabla(\vec{A} \cdot \vec{B})=(\vec{B} \cdot \nabla) \vec{A} + ( \vec{A} \cdot \nabla ) \vec{B} + \vec{B} \times (\nabla \times \vec{A})+ \vec{A} \times ( \nabla \times \vec{B})$$...

wonderful read. thanks!

then I'm lost. what's the definition? I always tought it is the distance between the place where electric potential is 0 to where you want to measure the electric potential..

that's what I have written in the manual. Electric potential V = Q/(4*pi*epsilon) * 1/r. Should I upload a picture of the manual?

the distance from where the electric potential is 0 to where you want to measure the electric potential.

k * q1 / r ( where K is 1/4 pi epsilon )

Electric potential

I'm outside and I can charge eighter the bigger or the smaller or both of them. I have to have the specs from eighter a) or b) on 1 of them.

Why to NASA?