Recent content by PhizKid

Goan

No, in the spring after I transferred from CC I took 21 credits, 12 credits for the summer session, and 21 credits this semester. I don't have all 'A's (a few 'A-'s and a couple 'B+'s in courses unrelated to my major). I can skip the upcoming winter session to save money and grab the rest of the...

To clarify some things: In regards to 3), I have already transferred to a senior college. 2), I will graduate after next semester, so I would have to start shelling out money to take extra courses since my degree will already have been completed (money which I don't have). 1) is something I...

I am writing the letter for myself, for professors to sign off on (they either don't write English well, or don't feel like writing a letter themselves). I obviously don't know the grad school process, which is why I am asking advice from more experience personnel about what I should...

Yes.

I'm not sure what the content should be like in a letter of recommendation for graduate school, and what adcoms are particularly looking for in these...besides praise for the student, I guess? What should and shouldn't be included in the letter?

If he really wanted to popularize the site so badly (and make "understanding physics" a "low priority"), he'd just bring back the Philosophy section and allow crackpots to post..

Plot twist: It's actually a penny

While attempting Rudin's Principles of Mathematical Analysis, I only got about as far as page 9 before losing him in the proof that ##\mathbb{Q}## is dense in ##\mathbb{R}##. While his proof is only a few lines long, it does reveal some important properties that result from this theorem...

Bear with me here because this is the part I don't understand. Why does the quasi-static shortening necessitate the need for a time average of the tension when calculating the infinitesimal work done? In other words, why can't we make sense of the infinitesimal work done by the exact force...

In the calculation I was simply pushing one face of the cube inwards by some small amount so the area of the face is the same since the push is normal to the face itself.

##\kappa = \frac{1}{V}\frac{\partial V}{\partial p} = \frac{1}{A L}\frac{A \Delta a}{\Delta p} = \frac{a N^2 \Delta a}{N (N^2 k_0 \Delta a)} = \frac{a}{k_0 N}##

Ah yes sorry. We have, taking as usual the outward radial direction emanating from the hole to be positive, ##mg\cos\theta - F = -ml\dot{\theta}^2## so ##F = mg\cos\theta + ml\dot{\theta}^2## hence ##\vec{F} = -(mg\cos\theta + ml\dot{\theta}^2)\hat{r}## since the applied force on the string is...

Ah yes you're right. We should really have ##F = -(mg\cos\theta - ml \dot{\theta}^2)\hat{r}## where ##ml\dot{\theta}^2## is the magnitude of the centripetal acceleration on the pendulum at any instant, again since ##\frac{dl}{dt} \rightarrow 0## in the quasi-static limit. Then the work done on...

Homework Statement A string with a lead ball of mass ##m## is slowly pulled upward through a small hole. Consider the work done on the system during this process and find the change in energy and the frequency of this pendulum during this "adiabatic process", assuming the amplitude of the...