Multiple Definition and 1000 Threads

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...

Homework Statement Hi, I need to create an experiment for my regression class and I would appreciate some ideas which would allow me to generate the data with minimal resources (preferably something on the computer where I can get data instantly) The main criteria for the experiment...

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?

Let say I have a simple fan/duct system delivering air at standard conditions with one branch at inlet and one branch at discharge. The fan is operating in its stable region with known flow rate and system pressure. Now if I add a branch on the inlet side (not necessarily at the fan) to...

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...

Hi, it's probably a stupid question, but I was wondering if it's possible to build interferometers with two perfectly calibrated lasers at the same wavelength. Would the same sort of results appear as with a single source of light, or does the fringe shifting effect only appear when the photons...

Help -- Seperation of variables problem, multiple solutions. Homework Statement Suppose that dy/dx = √y and y(0) = 0. What is y(x)? There is more than one answer to this problem. You must list five correct solutions. Homework Equations Seperation of Variables/ integration The...

After conducting my experimental work I will have a number of sets of data. It is easy to use Mathematica to find a fit of just one set, but I would like to fit all sets at once as they are too many to do them all ate once. They will all be fitted by the same function say y=ax+b, every set...

Suppose we have a 2d problem (for instance a 2d box). You look for separable solutions in x and y. But it seems to me that the solutions are in a way determined by how we choose the separation constant. Do we know anything a priori that tells us if the separation constant should be negative or...

The following is the advancement of what I discussed in the link https://www.physicsforums.com/showthread.php?p=4274966#post4274966 Problem Statement To calculate Pump Discharge Pressure, Calculate the wattage for the pump Data : Water @ 85 Degree C Flow in for 24” pipe : 3010...

I cannot understand why the electron orbit should be an integer multiple of De Broglie wavelength. Why should the wave path "fit" the electron orbit for it to be stationary?

Please help me with multiple comparisons - urgent (stats) Hello, I just have a quick question understanding multiple comparisons and I'd appreciate any help because I'm on the verge of failing :rolleyes: I'm reviewing for a test, and reading over questions and their corresponding answers in the...

Primitive roots of 1 over a finite field Homework Statement The polynomial x3 − 2 has no roots in F7 and is therefore irreducible in F7[x]. Adjoin a root β to make the field F := F7(β), which will be of degree 3 over F7 and therefore of size 343. The multiplicative group F× is of order 2 ×...

Hi, I shall show the following: (f*g) \star (f*g) = (f\star f)*(g\star g) where * denotes convolution and \star cross-correlation. Writing this in terms of integral & regrouping: \int_{\phi} \left(\int_{\tau_1} f(t - \tau_1) g(\tau_1) d\tau_1\right) \cdot \left(\int_{\tau_2} f(\tau_2)...

In what kind of math course would one learn the proof of the theorem that introduces the Jacobian to computing multiple integrals under various transformations? My calculus textbook has this theorem, and uses it to derive the triple integral formulas for cylindrical and spherical coordinates...

Hi, I have a simple tcp server, to which i would like to add support for multiple client connections via pthreads. This is what i had in mind, calling accept in a separate thread. I this similar to what you would do? . . . int sock = socket(PF_INET,SOCK_STREAM,0); int...

Homework Statement Find the voltage across the 10 ohm resistor. http://www.spacemonkeybrewing.com/images/circuit.jpg Homework Equations KVL - Sum of Voltages in a closed loop equal zero. Ohms - V=IR Voltage Divide - Va1 = (R1/(R1+R2...))Vs The Attempt at a Solution This is only...

Homework Statement Determine how many integrals are required for disk, washer, and shell method.Homework Equations x=3y^2 - 2 and x=y^2 from (-2,0) to (1,1) about x-axis.The Attempt at a Solution Since there are no breaks or abnormalities in the graph it appears that 1 integral will solve for...

Hey gang, I am trying to figure out a solution to a small problem i have.. and it is probably really simple, especially to you guys. I want to be able to power on a series of monitors and then a PC, with a small delay, by turning the main power switch on. To give a better...

Homework Statement How to find equilibrium points between four point charges? How do you determine whether these equilibrium points are stable, unstable, or neutral? I know the sum of the forces should equal zero, but that's it. How do you determine the stability of the equilibrium...

Homework Statement So, I know how to solve multiple equations using the cSolve method on the ti 89, but for some reason when I try to solve the following... 80a + 240b = 0 and (80+J79.975)a-80b = 50 by using the following syntax... cSolve(80a + 240b = 0 and (80+J79.975)a-80b = 50...

I'm familiarized with finding limits of most kinds of functions. I was struck by a problem: What if the variables of the function belong to different sets of numbers? My point being, given the function: f(n,q)=\frac{n}{q} With n belonging to the set of natural numbers and q belonging to the...

So I am working on a cart and the last thing I can not figure out is the math to the braking system. It is relatively simple, though I have over complicated it. I am lost with how to add the multiple levers in play. So let's begin. Problem 1) What is the ratio of force between input and...

Are you familiar with multiple languages? This is the thread to discuss what languages you like the best, what advantages/disadvantages they have over others, etc. I am familiar with C, Python, Ruby, Scratch, and JavaScript. That's all I can think of. IMHO: Python and Scratch definitely...

Homework Statement Find the volume bounded by the following surfaces: z = 0 (plane) x = 0 (plane) y = 2x (plane) y = 14 (plane) z = 10x^2 + 4y^2 (paraboloid) Homework Equations The above.The Attempt at a Solution I think it has something to do with triple integrals? But...

Homework Statement Okay so I was given this question to start calculating error on other problems. Consider the equation F(x,y,z) = x^4+2y^3+5yz+5. Let the uncertainty in x be represented by the variable dx, the uncertainty in y be represented by the variable dy, and the uncertainty in z...

I'm reading this programming code that basically says if 1 of 2 variables (x and y) is less than 0, then their least common multiple is 0. If we have x=-2 and y=+3, then their least common multiple is 0. I don't get it. I know what a least common multiple is, but this one isn't very...

Hi, I've been reading up a bit on the shortest path problem in graph theory and was wondering if the problem I'm trying to solve is a variation of the same graph theory problem. Say you have a grid of vertices and edges representing aisles and cross-aisles in a warehouse. In a standard...

I'm sorry if this has already been completed or already discussed. If so, just link me to answer the question, thanks. What if we conduct a double slit experiment with two observers? We use a detector to see which slit the electron passes through. Observer A receives results that the...

Is it ever the case in particle accelerators such as the LHC that a collision occurs involving three or more particles (e.g. two particles collide then some of the debris from that collision impacts a third particle)? Does the same phenomenon.also occur in cosmic ray collisions (I would...

Guys. I really need help. I have been working in this little problem for hours. I had a problem in array reading when I opened more than 1 files, it seems like an array with different names mixed each other. Here is my code integer, parameter::size=11 real, dimension(101) :: cldata...

Hey all, So the idea is that I'm trying to create a composite ranking system of items that are already in different categories. For example, suppose there are 4 houses that a buyer is choosing from. These 4 houses are ranked 1-4 in each of the categories such as affordability, location, and...

Hi, I am trying to simulate muon paths through drift tubes and I have ran into a problem performing a linear regression. I have generated simulated muon trajectories in 2 dimensions and they passes through my simulated drift tubes represented as black circles with a '+' in the center. As the...

So I was reading my textbook and it says that we are given a situation where two particles of the same charge are separated by the distance 0.0200m. Another particle of the opposite charge is then placed in between the other two particles, 3/4 the distance mentioned away from one and thus 1/4...

I have three different liquids l1, l2 and l3 stored for 10 days. The liquid are required to be kept in temp x1, x2 and x3. As input i have following: 1) daily temp of all three liquids 2) daily qty i need to keep temp of all three liquid constant - to do that heating is done. Due to...