Hi,
In a project of mine I've encountered the following set of equations:
$$ \sum_{i=1}^N \left(\frac{1}{M}\sum_{\alpha=1}^Mg_{ij}^\alpha - u_{ij}^* \right) = 0 \qquad \forall: 1\leq j \leq N$$
$$\sum_{i<j}\left( (u_{ij}^*)^2 - \frac{2}{M^2}\sum_{\alpha < \beta}^Mg_{ij}^\alpha g_{ij}^\beta...
This is actually not a homework problem, but a problem I'm encountering while working on a little project and I'm not sure if it's even solvable or if it makes sense what I'm doing
1. Homework Statement
First, I have the equation
$$p_{ij} = \frac{1}{2}\left( \tanh{(-\frac{\theta_i +...
I realized that I know nothing about the history of physics!
Does anyone have any good recommendations on this topic?
For example I'd like to have a clear timetable in my head about what was discovered at what time? by who? what were the methods/thoughts that went into it and what did the rest...
Hi, I'm trying to calculate the partition function for a certain system and I arrived at an expression for the partition function $Z$, and have been stuck here for two weeks at the least. This is not a homework problem. If this is the wrong place to post a question like this, could you please...
Hey everyone,
I'm sorry if this is not the right place to ask this, but here it goes:
I have to do a presentation on a topic on quantum computing.
Does anyone know any cool doable topics? We have been working through Ballentine's quantum mechanics book, to give you an idea of the level.
Thanks!
Hey everyone.
I'm currently doing my Master in Theoretical Physics, because I like to study physics, but I don't want to have a career in physics. Right now I'm looking at a career in (quantitative) finance. I don't have any knowledge of it yet. Does anyone have any tips on making this switch...
Hey,
I have not done any proper differential geometry before starting general relativity (from Sean Carroll's book: space time and geometry), so excuse me if this is a stupid question.
The metric tensor can be written as
$$ g = g_{\mu\nu} dx^{\mu} \otimes dx^{\nu}$$
and its also written as...
hello,
I would like to learn general relativity.
To understand general relativity, do I need to understand the math on a rigorous level? (the way mathematicians understand the math) . What math do I need?
Can you suggest me some math/general relativity books?
Thanks and sorry if my english...
hey,
I'm a 3rd(last) year physics student.
I have the feeling that I am forgetting everything that I learn very rapidly. For example, in my 1st year
I had things like classical mechanics, optics and classical electrodynamics. At the time I understood these subjects pretty well, and aced them(I...
Homework Statement
This is the problem:
http://i.imgur.com/OJyzfhz.png?1
Homework Equations
$$\frac{dL}{dq_i}-\frac{d}{dt}\frac{dL}{d\dot{q_i}}=0$$
$$ L=\frac{1}{2}mv^2-U(potential energy)$$
The Attempt at a Solution
This is my attempt at question A):
http://i.imgur.com/IeJVGm3.jpg...
Homework Statement
P is the part of the curve 9y²=4x³ between the points (1,-2/3) and (1,2/3).
Evaluate the integral $$\int_P x ds $$
Homework Equations
The Attempt at a Solution
$$\int_P x ds = \int_P x |r'(t)| dt $$
My problem is that I cannot find a right...
Homework Statement
Find the electric field along the y-axis of a charged semicircle (with the center of the circle in the origin) with radius R, with a uniform charge distribution $$ \lambda$$ ...
Homework Statement
Definite integral:
\int \frac{\ln(x+1)}{x^2+1} dx from x=0 to x=1 (sorry I don't know how to do integral boundaries with tex)
The Attempt at a Solution
I just am clueless on how to do this, I'm almost 100% sure you are not supposed to find the anti-derivative...
Homework Statement
Two planes are flying (one behind the other) with the same speed v with respect to the ground, and they have two identical clocks on board.
The distance between the planes is determined on x_1 (they don't mean the distance measured is equal to x_1 do they..?). On t=0...
Homework Statement
I'm trying to find the acceleration of the masses in an atwood machine, the pulley has a rotational inertia I. The pulley has a radius R
Picture : http://en.wikipedia.org/wiki/File:Atwood.svg
But I made it accelerate the other way, so the equations from newtons 2nd law are...
Hello!
Why is it so, that if you have a number, for example 183, you take the sum of the digits of that number, so 183-(1+8+3), u get a number that is always dividable by 9?
I'm sorry if this is a dumb question, I'm not very good at math but still curious to know.
Homework Statement
A coil with 10 windings(radius 0,07m) is inside a homogenous magnetic(B=0,050T) field, it makes an angle of 90 degrees with the field lines so the magnetic flux is at it's max. Over a period of 0,050 seconds it gets turned by 180 degrees, what is the average induced...
Hello, I don't need help solving a problem, but need help explaining why the given answer is true because I don't understand.
A guy is jumping from something(outside) and I need to calculate the air pressure at a certain height.
Given is that the temperature on sea level is 1,013*10^5 Pa, and...