Multiple Definition and 1000 Threads

Homework Statement Three blocks are on an incline of Theta(a), block 1 has mass of m1, block 2 has mass of m2, and block 3 has mass of m3. Block 2 is being held(theoretically) above the ground by friction between block 1 and block 3. What is the minimum magnitude of force positioned directly...

Homework Statement I'm stuck at one of the derivations for relativistic energy. I've figured out every other single step, but I just can't wrap my head around this one: Prove that: {\frac{d}{dt}} {\frac {mu} {\sqrt{1-u^2/c^2}}} = {\frac {m {\frac{du} {dt}}} {(1-u^2/c^2)^{3/2}}}...

I'm not exactly in college yet but will be soon. Looking at several threads, reus are extremely competitive, especially for freshmen. Many say to apply to ten or fifteen of them. But is it typical to send that many LoRs for one student?

Homework Statement Calculate the power absorbed at t=0,t=0+,and t=200 mS by each of the elements in the circuit of fig 11.25 if us is equal to (a) -10u(-t) V (b) 20 + 5u(-t) V Homework Equations The Attempt at a Solution...

I am trying to understand why in a SHM, the acceleration has multiple components(when actually we create such expressions mathematically by approximating the trigonometric expressions using the binomial theorem).I will explain what I mean to ask below with an example. In a internal combustion...

I am in a first year physics course at university, with little background in maths and science. Homework Statement When a dog stands at rest with each of its four feet on a separate set of scales, each scale reads a value of 45n. if this dog then carefully lifts one foot of the a scale...

Hi, i got problem i am trying to solve. Basicly i got point moving along bunch of lines ( either rectangles/triangles it is custom, generated in code ). I am using this equation to find out x,y coordinates for moving along specific line : (its taken from code ) x = x1 + center.x + (x2 - x1)...

Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, I've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange...

Homework Statement This isn't a homework question, just one I can't get the correct answer to. The circuit diagram is attached, and I need to find the voltage at V. The Attempt at a Solution Assume the voltage drop across each diode is 0.6V. Let V_5 be the voltage drop across the current...

Homework Statement Create the following matrix by typing one command. Do not type individual elements explicitly. \begin{array}{ccc} 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 1 & 4 & 7 \\ 0 & 0 & 2 & 5 & 8 \\ 0 & 0 & 3 & 6 & 9 \\ \end{array} Homework Equations None The Attempt at a...

Hi guys, I am kind of a newbie to fortran and I'd like to ask a simple question. In the code below, I have a main program with one subroutine. It's a simple one. In the main code I am filling an array with elements from 1 to 10. Then I am passing this array to a subroutine "sub", where...

Hi all! In a paper they say that a certain quantity is a rank-2 tensor because it transforms like a spin-2 object under rotations, that is: if the basis vectors undergo a rotation of angle \phi, then this quantity, say A, transforms like A\mapsto Ae^{i2\phi} As far as I knew, a rank-2...

Say I have a rectangle of width w and height h centred at (0, 0) on a 2D coordinate plane. The rectangle is free to move on a frictionless medium. It is not attached at any point. Case 1: A single force F = (Fx)i + (Fx)j acts at a point (x, y) How does the rectangle move? I looked it up on...

Homework Statement The system is in equilibrium and the pulleys are weightless and frictionless. The weights are 25 N, 4 N, 4 N, and 1 N. Find the tension T. The acceleration of gravity is 9.8 m/s^2. Answer in units of N Homework Equations F=ma The Attempt at a Solution Honestly...

Homework Statement Which of the following is not the same as the derivative of y with respect to x, if y= f(x)? (a) lim as Δx -> 0 of \frac{Δy}{Δx} (b) lim as h--> 0 of \frac {f(x+h) -f(x)}{h} (c) lim as x_1 -> x of \frac {f(x_1)-f(x)}{(x_1-x)} (d) lim as h-> 0 of \frac {f(x) -...

Hello, this has been concerning me for a while now. I've seen online many testimonials about how important recommendation letters are for acceptance into a graduate program. I only have minimal research experience as of now, and I'm currently working at an internship I will likely be...

1. Find all the solutions to the equation z^4 + j^4 = 0 2. z^n = |a|e^j(Θ + 2pik) 3. I really don't know where to start, I thought about j^4 = 1, so z^4=-1. I then simplified to conclude that z^4 = -e^jpi. I am not sure if that is correct and if it is what to do next.

$prove :1\times 3\times 5\times---\times 1999\times 2001 +2\times 4\times 6\times---\times 2000\times 2002$ is a multiple of 2003

Homework Statement A five-slit system with 8.4*10-6 slit spacing is illuminated with 610*10-9 light. Find the angular position of the first two maxima, and the 3rd and 6th minima. Homework Equations For Maxima: d*sin(θ) = m*λ θ = sin-1((m*λ)/d) For Minima: d*sin(θ) = (m/N)λ θ =...

This is possibly a very silly question, I am not experienced in this field. I am creating a Can Crusher for a project. If it takes 8n to crush a can. Will it still take 8n to crush multiple cans joined together end by end? Also, if multiple cans were being crushed on a platform, against...

Homework Statement Determine if f(x,y) = ((x-y)4 +x3 +xy2)/(x2+y2) [f(x,y = 0 @ (0,0)] is differentiable at the origin. Homework Equations x = (0,0) The Attempt at a Solution A function is differentiable at x if f(x+Δx) - f(x) = AΔx + |Δx|R(x) Where A are constant...

Hey all, I am hoping to make a system that can play multiple, varying sized speakers. I want to frankenstein this with speakers I can find around my house. I have a bunch of old computer speakers and even a few subwoofers which I would like to utilize (if possible). I am assuming that I need...

I have a MySQL database and I have the problem that queries take way too much time. I want to optimize the database and one way would be to save data into a string, instead of in rows (the string would be replicates of the same condition). Each string is an interval of 4 seconds, to reduce the...

I'm looking for some really good an thorough multiple choice practice finals for my Electricity and Magnetism class. anyone have any recommendations? My goal is to get an A on this final and that is going to be very difficult so i need some really good practice. thank you for you help.

Homework Statement In the figure ε = 15.1 V, R1 = 1560 Ω, R2 = 2130 Ω, and R3 = 4210 Ω. What are the potential differences (in V) (a) VA - VB, (b) VB - VC, (c) VC - VD, and (d) VA - VC? The figure consists of single ideal batter connecting to a diamond shape circuit ABCD. Going clockwise...

Homework Statement In triangle PQR, the length of QR is 4 mm, the length of PR is 3.5 mm and the size of angle Q is 60°. What are the possible size(s) of angle P (to 2 decimal places) The possible solutions are 138.81, 81.79, 118.96, 61.04, 98.21 The Attempt at a Solution I've solved for...

I've been trying to wrap my head around 3D rotations and specifically, Euler angles. I thought I had a good understanding of performing multiple rotations, but after writing a Matlab script that graphically shows my rotations, I am not so sure right now. My biggest hang up is whether or not a...

Dyadic Cube C_{k,N} = X \in\ \mathbb{R}^{n} \frac{k_{i}}{2^{N}} \leq x_{i} < \frac{k_{i}+1}{2^{N}} for 1 \leq i \leq n Where k = \pmatrix { k_{1} \cr k_{2} \cr \vdots \cr k_{i} \cr } I understand that N is the level of the cubes, but what does k equal? I'm having trouble...

Hi, Consider the algebraic function w(z) given by the expression f(z,w)=a_0(z)+a_1(z)w+a_2(z)w^2+\cdots+a_n(z)w^n=0 where f(z,w)is irreducible over the rationals, and the coefficients, a_i(z), polynomials with rational coefficients . Let z_s be a point such that f(z_s,w)=0 has roots with...

Consider the reduce operation for example. Do all nodes send data directly to the root? Or is there some structure where a node will receive data from a few other nodes, perform a reduction, then pass the intermediate results to other nodes?

Homework Statement Problem: Three common gaseous compounds of nitrogen an doxygen of different elementary composition are known, (A) laughing gas containing 63.65% nitrogen, (B) a colorless gas containing 46.68% nitrogen, and (C) a brown, toxic gas containing 30.45% nitrogen. Show how these...

Hi, I tried using geogebra to find an equation that exactly goes through the list of points I plotted on the graph but I failed to find any way so far. I have tried using, FitExp, FitGrowth, and Fitline, and so far none of them worked. I have no idea what kind of equation this is so I cannot...

This past Monday I took an exam and got a 99, woot woot! But I can't seem to understand why I got the following question wrong: Complete the following statement: A simple series circuit contains a resistance R and an ideal battery. If a second resistor is connected in parallel with R, A) the...

Question Find all the values of ∏ in the interval 0 < θ < 2∏ for which 2cos2 θ – sin θ = 1, giving each answer in terms of ∏ I think the question is asking me to find the values of θ in terms of ∏ for all values between 0 < θ < 2∏ This is what I have done so far I have worked...

Homework Statement I need to find the volume of the region bounded by (x-1)^2 + y^2 =1 \ \ \text{and} \ \ x^2+y^2+z^2=4 \ . But I only need help setting up the limits of integration. Homework Equations The typical cylindrical change of variables. The Attempt at a Solution I have 0 \leq...

Homework Statement 1. Positive charge Q is placed on a conducting spherical shell with inner radius R1 and outer radius R2. A point charge q is placed at the center of the cavity. The magnitude of the electric field produced by the charge on the inner surface at a point in the interior of...

There are two springs attached together (the second spring begins where the first one ends) and they both have different value for spring constant. The total spring potential energy can be found by the following formula \frac{1}{2}ks_1^2 + \frac{1}{2}ks_2^2 but to solve for s1 and s1 I saw the...

Homework Statement design a regression model that will use the dataset y trial x1 x2 x3 0.08536, 1, -1, -1, -1.00000 0.09026, 2, -1, -1, -1.00000 0.10188, 1, -1, -1, -0.33333 0.09301, 2, -1, -1, -0.33333 0.10362, 1, -1, -1, 0.33333 0.09920, 2, -1, -1...

Homework Statement 1. A cylinder of radius R = 6.0 cm is on a rough horizontal surface. The coefficient of kinetic friction between the cylinder and the surface is 0.30 and the rotational inertia for rotation about the axis is given by MR2/2, where M is its mass. Initially it is not...

equilibrium -- A rod influenced by multiple rope tensions Homework Statement Smooth and identical rod has a weight of P. The rod seems to be in equilibrium with X and Y which has a weight of P. What can be the weight of X according to the values below?(ip means rope) P , 6P or 9PHomework...

Hello, I hope somebody can help me with this one. Homework Statement I want to find the integral of 1/x^N*exp(ix) from -inf to inf. Homework Equations It is very likely that this can somehow be solved by using Cauchy's integral formula. The Attempt at a Solution I tried to...

how to determine series and parallel connections in a resistors when multiple batteries are used?

In the following "semi" table, is a group of magnets, all seem to have the same Surface field but all different pull force(attraction/repulsive force at maximum with gap = 0). How is it possibile to have the same S.field rate but different forces? Is it due to the size of each magnet...

How do you prove that: Every perfect square is either a multiple of 3 or one more than a multiple of 3? There is something very basic that I don't seem to understand in the question. Here is proof that someone gave me: Every natural integer p must fall in one of the following case...

I'm testing my faith in the photon. I understand that energy levels are quantized, and I understand that the EM field carries momentum. I want to make sure the idea of a photon is necessary to intuitively understand the observations. I am focused on compton scattering of a photon and an...

Hey everyone, I need to do the following integral. I just need a little help getting this started, I'm not sure where I need to go. Here is the problem: \int_{0}^{1-v} du \int_{0}^{\frac{1}{2}} dv \frac{1}{1+u^2-v^2} I think I have the boundaries for the integral set up correctly, {0≤v≤1/2...

So, as the title may have given away, I'm trying to figure out implicit differentiation in the multiple variable context. I thought a good practice would be the law of cosines, aka c^2 = a^2 + b^2 - 2abcosθ. So I'm trying to find ∂θ/∂a, ∂θ/db, ∂θ/dc. I tried solving for θ and then taking...

Will someone please explain to me how a theory, such as a quantum field theory, be expressed in more than three dimensions? Is this referring to the spatial dimensions we live in now, or what? And how does someone even begin to ponder these multiple dimensions?

Homework Statement A parallel-plate capacitor is constructed by filling the space between two square plates with blocks of three dielectric materials, as in Figure P26.61. You may assume that l >> d. (a) Find an expression for the capacitance of the device in terms of the plate area A and...

My understanding is that as I move, from my FoR all objects and space itself (according to Einstein) contract along the direction of my movement. This length contraction occurs for all space and objects in front of me for an infinite distance. Furthermore, relative motion is relative, and the...