Recent content by toqp

Edit: Of course... I've completely forgotten translational conditions. The pivotal point C is not translationally at rest.

Homework Statement http://img21.imageshack.us/img21/7103/fig1jpg.png The rods in the system are rigid and massless. The only mass in the system is that of the weight (mass m). The system as a whole is pivoted at a point A. The lower rod is pivoted at a point C. If the system is set...

Ok, thanks for your answers, everybody. I'd still like to ask about one thing though (it was in an earlier post, but I'll move it here and add some thoughts.) What causes the fact that a substance can't be heated above it's (pressure dependent) boiling point? What causes it that the...

This I can understand. I wonder if this is what someone means when he tells that steam is hotter.

Thanks for your answers. What still puzzles me is the way those different kinetic energies build up the statistical phenomenom of temperature. I mean why are rotational and vibrational energies grouped together with negative potential energy. Ok. In that case, wouldn't the water too be at a...

I know I should get this, but I don't... So, I've been told that whenever I put some water into a kettle and then heat it to the boiling point, the steam coming from the kettle is hotter than the boiling water. Why is that? And why is the temperature graph usually depicted as it is at...

This is not any homework problem but just something I don't understand. The Bloch theorem states that \psi(\textbf{r}+\textbf{R})=e^{i\textbf{k}\cdot \textbf{R}}\psi(\textbf{r}) Now the k is a vector in the reciprocal lattice (usually in the first Brillouin zone), which is defined as the set...

Homework Statement A problem from an examination: A hydrogen atom is in the state \Psi=A(\sqrt{6}\psi_{100}+\sqrt{2}\psi_{200}+\psi_{211}+2\psi_{31-1}+\sqrt{3}\psi_{321}+3\psi_{32-2}) where \psi_{nlm} are the eigenfunctions of hydrogen. Find A so that the equation is normalized. Homework...