I saw that before I made this thread. That's not quite as much information as I'd hoped.
I was hoping for sort of like an introduction on the subject. For example, the first textbook I ever learned E/M out of is by Arthur Kip. Each chapter is organized in two parts. First, they present a law...
Consider the following circuit:
http://www.ibiblio.org/kuphaldt/electricCircuits/DC/00207.png
The voltage at the node between the resistors is:
V = (V1/R1+V2/R3)/(1/R1+1/R3+1/R2)
Suppose R1 = R3 = R. Then:
V = (1/R)(V1+V2)/(2/R+1/R2)
V = (V1+V2)/(2+R/R2)
Now let R go to zero...
An electric charge produces a Coulomb electric field:
E = dqe r/r3
A current element produces a Biot-Savart magnetic field
B = i dl×r /r3
From what I understand, magnetic charges are inserted for the sake of making Maxwell's equations symmetric.
A magnetic charge is meant to produce a...
Hi everyone. This isn't a homework problem. Rather, I'm trying to understand how the δ term arises from the field of a dipole.
Homework Statement
Greiner supplies the following one-line derivation, which is easy to follow I guess, but doesn't make logical sense to me. Specifically, I don't...
According to Fractional Calculus, the power rule can be written as
(dm/dzm) zn = n!/(n-m)! zn-m
For example,
(d1/2/dz1/2) z1/2 = (1/2)!/(1/2-1/2)! z0 = (1/2)√π
To find the residue of f(z) = f(z)/(z-z0)m at z→z0, the formula is Res(z→z0) f(z) = 1/(m-1)! dm-1/dzm-1 f(z).
For...
The three circuit elements are capacitors, resistors, and inductors, which act in the following manner:
Capacitor: V = (1/C) q
Resistor: V = R dq/dt
Inductor: V = L d2q/dt2
Is it possible to build a passive device that acts like:
V = (const.) d3q/dt3
Google search has come up with...
Simple question. It came out of lecture, so it's not homework or anything. My professor said that the curl of a vector field is always perpendicular to itself. The example he gave is that the magnetic vector potential A is always perpendicular to the direction of the magnetic field B. (I haven't...
Head down to your university library, and find the section where they store all the old editions of physics textbooks. Sit down, and read through the section you're learning, and pick out two that you think explains that section best. This is important. First, this teaches you how to judge the...
Just use your TI-83. Dot products and cross products can both be expressed by matrices, which is included in the TI-83. Alternatively, you can write a program that just spits out your desired numbers.
Your method for part 3 is correct. However, your method for part 1 is incorrect, which led to an incorrect answer. Next time, try to do the problem with variables as opposed to numbers. It looks cleaner, and it's easier to identify where you went wrong.
In the setup of the problem, the balloon...
Did you read the question?
"it is tied to a small stone of mass 0.015kg by a light string of length 1.5m to prevent it from flying away."
If the upward force of the balloon could lift the stone indefinitely, then the stone isn't doing its job.
"(b)What is the velocity of the stone when it is...
Recently, I came across a website of a guy that has had a physics education, but for whatever reason, he rejects it. He seems more like a troll than a legit crack. However, this got me wondering: how do people become so delusional as to dedicate hundreds of hours writing such crap? Do you think...
Hey Dragoon. I don't understand how you were able to deduce Huskyguy's desires and capabilities from the limited amount of information he gave. I also don't understand how your advice to change majors was relevant and warranted. Furthermore, he already dropped the class, so I don't understand...
-edit-
I see where the misunderstanding is.
If you're in a PhD program, you should certainly file for a M.S. after you're qualified for it. It won't cost you anything excess, and if you drop out for any reason (your research takes too long, you run out of funds, etc.), at least you end up...
You definitely made the right choice. If your brain is a structure and your teachers are construction workers, you do not want the structure to eventually collapse due to one teacher's negligence.
This.
d/dx ln(x2+2) = 2x/(x2+2), which is obviously not equal to 1/(x2+2). Never forget the chain rule.
To integrate 1/(x2+2), you need to use trigonometric substitution.
I'm not sure why nobody has mentioned this yet, but the situation becomes clear when you assign R and S configurations to each stereocenter. A stereocenter is defined as the position of an atom with four unique substituents. Also, lone pairs of electrons are substituents, so don't skip over an...
That's contrary to what I heard. I heard that you need at least a 3.0 GPA in order to even be considered. Only if you make it past this initial screening will having published research be helpful to your application.
Besides, how do you plan on publishing research in such a short time frame?
Physics is actually quite simple. The entirety of physics is composed of two parts:
1. Setting up the problem mathematically
2. Solving what you set up
As you can imagine, part 1 is the most important. However, part 2 can also be revealing, because sometimes, you can use the answer you get in...