Recent content by JJfortherear

What does the operation : signify? I assume it yields a scalar here, since the expression is for energy, but how is it defined? Thank you

Homework Statement Rectangular pipe, infinite in the z direction. The sides in the y-z plane (at x=0 and x=a) are held at V=0, while the sides in the x-z plane (at y=0 and y=b) are held at V=V0 Explain why there cannot be a non-trivial solution to this configuration. Homework...

http://imgur.com/cbQ44 I'm just not sure how they come up with that... *note, the E0 is not ground state energy, it's a constant electric field.

If you've got a spring, one end pinned up the y axis, and a particle constrained to move along the x axis, but attatched to the other end of the spring, does it have any idea how far up the y-axis the spring is fixed?

Homework Statement A hemisphere of radius R, covering +/- R in the x and y directions and 0 to R in the Z direction (only the top half of a sphere centered at the origin) Find the center of mass. Homework Equations Cm=(1/m)\int(z dm)The Attempt at a Solution dm is sigma dA, and dA is x dz...

Homework Statement Sphere of radius R, Er=ER(r4/R4) Find the volume charge density (ρr) as a function of r Homework Equations Gauss's law The Attempt at a Solution I get that dQ=4πr2ρrdr, but have no idea how to solve for ρ

alright, was just waiting for someone to say it :)

Homework Statement integral of: 1/(((L2)/4)+y2)This is for proving the flux through a cube from a wire going through it is = Qenc/epsilon0 All that's left for one face after taking out constants is the above equation, and I really don't want to go re learn how to do partial fractions again...

awesome, exactly what I was looking for. Thanks a lot.

is it really possible to simplify the distance by moving the origin? I've thought about it and any time I try it seems to change the setup.

I've been told this is a differential equation, but I have no knowledge of the subject, so I'm hoping it is and that an answer can be found in this forum. The two equations x=1/2at2 and a=gm/r2, when r is replaced with (r0-x), with r0 being the initial radius from the mass from which the...

just wanted to clarify, one object is considered stationary (mass of something like a planet, but considered as a point, so x approaches r and the acceleration becomes infinite). I'm just looking for how to solve the two equations for x (and i realize that should be gm not gmm for acceleration)

I've been trying to figure this out for a while, since my first semester of physics ended. It's not a homework problem, just something I've been doing for fun. I've spoken with a few people about it and they all say it's just a diff. equation but they can't remember how to solve it, and...