Recent content by joemmonster

Homework Statement If a metal is adhered to a surface of another metal, let's say copper is plated onto aluminum, how can the elastic modulus of copper can be extracted given only the data of the thickness of the copper and aluminum, the young's modulus of the combined metal and the modulus of...

Homework Statement Using the equations, show the bulk modulus is about r^-4. Homework Equations The Attempt at a Solution Tried to plug Uij but it is not same as U. To be honest, I don't know where to start.

Homework Statement Using the total energy, solve for the equilibrium distance R0 α is given and other constants such as permitivity ε0, avogrado, N, and charge q. Homework Equations Utotal=-Nα(q2/4piε0)(1-ρ/R0) The Attempt at a Solution Tried to plug the values but I can't solve for R0 since...

Ok, I just found out that conductivity is also given which I can finally derive mean free path by using mobility and relaxation time.

Homework Statement The concentration of electrons per unit volume is given (atoms/m^3), temperature is also given in Kelvins (100 K). Other values were also given such as valence but I'm pretty sure that they are irrelevant. Homework Equations λ = 1/ pi * d^2 * n λ=kT/4∗π∗√2∗r^2*p The Attempt...

Homework Statement A geostationary satellite is to be placed to view the far side of the moon. How far away should it be placed from the center of the Earth and what velocity should it travel in order to maintain its orbit? (Considering the moon and Earth as one entity and solve for the center...

oh i see,,,

the video came from the MIT, so i think, its true, can you explain to me further why is this impossible, i don't get it??.. here's the other one..

actually, i saw a video on youtube. It was about a camera that can capture the movement of a light through a coke bottle, so, if you have that kind of eyes, then you might able to see the light just like a glowing object..