Computing Definition and 683 Threads

Homework Statement Homework Equations The Attempt at a Solution I am trying to find the equivalent resistance for part b. First, we turn off independent sources. We open circuit the 2A source and we close circuit the 30V source. We're left with two resistors. Are they in series or parallel...

Here is the question: I have posted a link there to this thread so the OP can view my work.

I'm trying to compute lateral strain for a bar (strain that would make it thicker, or have more cross sectional area). All I know are the initial and final diameters. This gives me d1 and Δd. Would the lateral strain be Δd/d or ΔA/A? (A is area)

Let P(x,y) be a point on a unit circle that is centered at (0,0). How to compute exactly the function \frac{\partial^2 x}{\partial s^2} where x is the x-coordinate of the point P(x,y) and s is the tangent at point P(x,y) . Clearly, \frac{\partial x}{\partial s} =...

Can anyone suggest any? I have all of the coursework for a PhD, So I'm not afraid of anything but I will have lots of questions.

Here is the question: I have posted a link there to this thread so the OP can view my work.

Homework Statement Homework Equations The Attempt at a Solution I am having difficulty understanding how the author determined the limits of integration of ##R##. The author used ##\theta=\pi/3\quad to\quad \theta=\pi/2## and ##r=1\quad to\quad r=1##. More accurately, I'm...

Assume we have a number ##S_0##. For ##i=1..n## define$$S_i=\begin{cases}(1+b)S_{i-1}\text{ with probability }p\\(1+a)S_{i-1}\text{ with probability }1-p\end{cases}$$. What is the expected value of ##S_n##?

Hey guys I need some advice: I am a Math/Physics freshman whos pretty much a noob to programming in general; I have some experience with Fortran (taught as part of laboratory) and Python (self taught) but only in the context of elementary numerical methods / scientific computing. I have...

Homework Statement An object is made from 2 solid disks: m1 = 23 kg, m2 = 39kg, and r1 = 17cm, and r2 = 33cm. The disks are connected by a thin rod of M = 11kg, L = 67cm. The object is held in a horizontal position and then let go. The object is free to rotate about a pivot through centre of...

Homework Statement Computer the integral of f(x,y,z) = x^2+y^2 over the sphere S of radius 4 centered at the origin. The Attempt at a Solution so if the parameters for a sphere are in terms of (p,θ,∅) , triple integral (p^2((psin∅cosθ)^2+(psin∅sinθ)^2))dpdθd∅) where the boundaries...

Homework Statement ##u(x)=1-e^{-ax}##. Random variable ##Y\in\mathbb{R}^d## is a multivariate normal distribution with mean vector ##m## and invertible covariance matrix ##\Sigma##. Task: Find ##\xi^*\in\mathbb{R}^d## that maximises ##\mathbb{E}u(\xi\cdot Y)## over ##\xi##. Homework...

Just curious. Is it possible to compute this? if yes then how?

I am preparing for a re-exam, this is a problem from the exam I took, but I can't see what I did wrong and why. Homework Statement Case: A turbine that is producing work dW is powered by compressed air (treated as a diatomic ideal gas). Known quantities: P_0, P_f, T_0 Wanted...

When there are answers this might be suitable for Math Learning Materials My untrusty HP48GX graphic scientific calculator conked out two or three years ago and since then for my limited needs (e.g graphs on this forum) in that time I used odd little programmes I found around for graphics and...

I've just started programming with Python this summer, and I'm taking a course in computational physics this semester. I've been really enjoying it and programming in general, but I don't have much knowledge in computer science save for intro stuff (string/list methods, functions/classes...

LiveScience Quantum Computing Breakthrough QE for short. Please read that article. I need someone to set me straight here... Is QE a real thing, as in it's no longer an idea but is 100% a real thing. If two particles become entangled then whatever happens to one particle instantly...

Homework Statement Using the Bohr model of the atom, compute the energy in eV of the one electron in Li2+. Homework Equations E_n=\frac{m\cdot e^4 \cdot z^2}{2n^2 \cdot \hbar^2} Where m= mass of electron, z= atomic number, e= charge of an electron, n is the energy level. ^ I think...

Hi! I am trying to compute the natural frequency of a system and I also need to add the added mass term to my equation. The object I have is a torus and is basically in heaving motion. I found a good paper, which gives a formula for 3d added mass and 2d added mass. I would figure that I...

How fast, exactly, is it hypothesized that quantum computers could feasibly reach? If an operation takes 1 second on an average modern-day computer, how long will it take a quantum computer, using an upper-bound idea for the speed these machines could one day reach?

Hi All, I am reading a paper in which the following integral is presented $$\int_{-\infty}^{ct-x} \int_{-\infty}^{ct-x} J (2t - \frac{2x+s_1+s_2}{c}) \frac{\mathrm{d}f (s_1)}{\mathrm{d}s_1} \frac{\mathrm{d}f(s_2)}{\mathrm{d}s_2} \mathrm{d}s_1 \mathrm{d}s_2$$ where J and f are unknwon...

Without using any computing devices, show which number is larger: $e^\pi$ or $\pi ^e$.

For a molecule of n nuclei and x total electrons, how can I work out how much computing power or processing time is required for an exact Full CI calculation for that molecule?

Hello, This is my first post and I must emphasise that I do not have a science/maths training background and this might be a very basic question. I apologise if it is too basic to belong here. I have a function defined as follows: E(I,J) = \int CC_{p}(I,J)dp Just a little context, I...

Hi, All: I'm kind of rusty in my computations. I'm trying to compute the pullback of the form dθ on S1 by a differentiable map f: M→S1, where f is differentiable and M is a 3-manifold; please tell me if this is correct: 0)Say we use the basis vectors {∂/∂x1,∂/∂x2, ∂/∂x3, } for TxM ...

M_{K}=\frac{1}{2^{k+1}-2}\sum_{i=0}^{L-1}\sum_{l=1}^{K}\binom{K}{l}h_{i}i^{l}M_{K-l} M_0=1 and the size of h_i is L. I tried to compute this summation in matlab, my attempt is as following: clear h=[ (1+sqrt(3))/4 (3+sqrt(3))/4 (3-sqrt(3))/4 (1-sqrt(3))/4]'; % for simplicity i take...

Hi, I have the following problem. Consider an age-structured population growing according to a Leslie matrix. Suppose the population is in stable exponential growth, i.e. its age-structure is constant in time, while the total population is exponentially growing (or decreasing) with exponent...

how is it that we are able to get atoms to work like bits? and what is their counting system? because simply counting in 1's and 0's doesn't seem to make so much sense when electrons can be doing any number of things when they are not being observed. i recently watched this but it didnt...

So I have come across a specification of a narrow field of view camera. The specification states IFOV=30 microrad FOV=2x2 resolution=<.1m at 1 km If I assume a 1K sensor at 9micron pitch and an aperture = 3.7cm I have resolution at .013 m Chip size = 9.2mm Focal length is...

Homework Statement (a) Compute the vector gravitational field at a point P on the perpendicular bisector of the line joining two objects of equal mass separated by a distance 2a as shown in Figure P13.26. (b) Explain physically why the field should approach zero as r ---> 0. (c) Prove...

I have been reading about physicists that study things like computational neuroscience/AI and quantum computing. It is my understanding that these subjects are very closely linked and form a relatively new and open area of science research. I also have the impression that a physics degree is the...

Homework Statement Compute the M sample DFT of: f(m) = cos(2*pi*(f*m)) for 0 <= m <= M-1 where M = 128, f = 1/16 This should be done by hand, and the solution will reduce to a very simple form. Homework Equations The Attempt at a Solution I slaved through this problem...

Here is the question: Here is a link to the question: Calculus Question ... Please HELP? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

What will the technological impact of Quantum Computing be? What meaningful benefits will Quantum Computing bring humanity? What will be the order of progression of its impact? How will Quantum Computing advance our technological growth curve? Where will the money in Quantum Computing be...

If I have a variable X whose gaussian distribution is known and let f be a known function, is there a way to compute f(X) (i.e) the resulting gaussian distribution from this? Is the result actually a gaussian distribution?

Homework Statement Choose an even number in the interval [100,199] and compute its orbit under the proper divisor function. Homework Equations Proper Divisor Function = σ(n) = Sum of all divisors of n, excluding n The Attempt at a Solution I am unsure what it means by "compute the...

Here is the question: Here is a link to the question: Quick Calculus 1 question!? - Yahoo! Answers I have posted a link there to this topic so the OP can find my response.

I am very interested in Quantum Computing but I am worried about getting a job, making it into a good university to do post grad etc. Do I need to do computer science to work in quantum computing research and development? I like computers but I don't like studying it, I have textbooks of...

I had a question about computing determinants and just was wondering what was allowed. So I know that for an n x n matrix, you can go across a row and choose the matrix element as your determinant coefficient for the (n-1) x (n-1) determinant and you go across the row and do this until you're...

Hi everyone. I've been looking at some computer aided design software, FreeCAD, and while it's to my understanding that engineers use programs like this constantly I wanted to ask if anyone knew if there programs are used in scientific computing or computational science and engineering. From...

Munkres proof for the Lebesgue number lemma which is (If X is a compact metric space and A is an open covering then there exists δ>0 such that for each subset of X having diameter less than δ , then there exists an element of the covering A containing it) gives a way to compute δ using a...

Hi This is help from lectures on quantum computing that I missed due to illness and now my professor is away. 1) Can anyone help me on what a function gate is and its matrix representation? I realize that the function is not something like x^2 but something that takes a value from 0 or...

EDIT: I'm not in my sharpest moment. I just found a bunch of posts that discuss this. I'll read them and update this post if I find an answer. I'm working on a hard-sphere MC simulation (for a class). I want to compute the radial distribution function g(r). To put you in context, as to my...

Greetings to all, I know activity for a Am-Be neutron source. I want to compute strenght source in neutrons/s. Yours advices are welcome. Thank you!

Is there theoretically any way to compute a coefficient of friction (solid on solid) without an experiment between the two materials? Say, some kind of simulation, or perhaps comparing both materials to an intermediary material?

Hi hi hi, So guys I'm just having a little trouble with this question.. Compute the ratio between the luminosity from part B to the mass from part A. How does that ratio compare with the Sun's ratio of luminosity to mass? So for part A I got 1Msun and part B I got 1000Lsun So to compute the...

Homework Statement The Attempt at a Solution Alright, so, I'm clueless about doing this one. I do know that it's extremely similar to e^x \sum_{n->0}^{\infty}\frac{x^n}{n!} But really, that means nothing! Usually there's another function/series I can compare and then integrate, in...

Homework Statement Just checking if these are right? f(b) = 2-2√b compute limit in are as: b-> 0+ b->1- Explain in a brief sentence why it does not make sense to compute a limit as b->0- Homework Equations given above The Attempt at a Solution lim b->0+ (2-2√b) = 2...

I know the result: \widehat{H(f)}=i\textrm{sgn}\hspace{1mm}(k)\hat{f} I thought I could use fft, and ifft to compute the transform easily, is there a MATLAB command for sgn? Mat

Homework Statement Let C be the semi-circle on the sphere x^2+y^2+z^2 = 2 from N = (0,0,\sqrt{2}) to S = (0,0, - \sqrt{2}) which passes through the point (1,1,0) Note that x=y for all (x,y,z) on C. Evaluate the integral : \int_C z^2dx + 2x^2dy +xydz Hint : Use as your parameter the angle θ...