Equivalent Definition and 1000 Threads

I have a washdown spec for a unit we are designing. We need to be able to withstand a maximum of 85 gpm through a 5/8" nozzle at 75gpm. Now, I don't have access to equipment that can mimic that scenario. What I'm wondering if can I use my average, run-of-the-mill, garden-variety pressure...

hello, I would like you to take a look at the picture below. My question is why it is states that de resulting moment vector is collineair with the force vector... This is my method to solve this kind of problems: *determine the moment about the three axis => than we now the 3...

I know this probably sounds weird, but I have a research problem that requires "random" analog circuits. Basically what this means is that I create Spice netlists by randomly adding linear and/or nonlinear components of random types with random node and parameter values. This works fine and I...

Is it possible to derive a formula for the equivalent resistance of n such sections in cascade? Show your analysis. Series: Reqv = R1 + R2 +...Rn Parallel: Reqv = 1/{(1/R1) + (1/R2) + (1/R3) +...(1/Rn)}

Homework Statement The question asks to find the Thevenin equivalent circuit as shown in the attachment. (It's a BJT problem, but I'm having difficulty with the first part). Homework Equations Where are terminal points I need to worry about when making it an open circuit? That's the biggest...

May anyone please help with the method of getting Thevenin Equivalent resistance (RTH) for the attached circuit. I have already found VTH to be 8V. Sim

Homework Statement All the wires on the front and the back hexagonal face (of the Skelton hexagonal prism) have resistance R. All the wires along the lines joining the vertices of two hexagons have resistance 2R. The equivalent resistance between P and Q as shown in the figure is The...

The question was to rank from highest to lowest equivalent resistance. This is what I came up with, but it was counted wrong and I don't understand why. http://i324.photobucket.com/albums/k327/ProtoGirlEXE/100_0687-1.jpg The equivalent resistance of resistors in series are added while in...

Given a crystal structure and the cell edges (a,b,c) , angles (alpha, beta, gamma) and the fractional coordinates of all atoms in the unit cell. Also given an arbitrary unoccupied site P by fractional coordinates (s1,s2,s3). How can I determine all the sites that are crystallographically...

Homework Statement Compare the function f(z) = (pi/sin(pi*z))^2 to the summation of g(z) = 1/(z-n)^2 for n ranging from negative infinity to infinity. Show that their difference is 1) pole-free, i.e. analytic 2) of period 1 3) bounded in the strip 0 < x < 1 Conclude that they are...

http://xkcd.com/356/ I'm clueless, yet curious.

Homework Statement Find the input impedance Z. (i.e. Find Z equivalent.) Answer in the back of the book: Z=84.907-j20.12 ohms [PLAIN]http://img834.imageshack.us/img834/8508/circuit.png Homework Equations n/a ** j=sqrt(-1) The Attempt at a Solution I combined the 60-ohm, 50-ohm, and...

The TL431 is a widely used as reference for voltage regulation. But in some cases there is a R and a C in the TL431 loop. I googled for the euivalent diagram, its an opamp with a reference and a diode in the feedback loop(+ve terminal of opamp and Cathode). I don't understand the function of...

Homework Statement Calculate the equivalent resistance between the points X1 and X2. Homework Equations R series = sum of resistances R parallel = reciprocal of resistances The Attempt at a Solution I'm sorry I do not get any idea on solving the question. I have done it in the...

Homework Statement In the circuit shown in the figure, R1 = 3.23 Ω, R2 = 5.19 Ω, R3 = 23.1 Ω, and V = 10.7 V. a) Determine a value for the equivalent resistance. http://img651.imageshack.us/i/p074figure.png/ Homework Equations Parallel is 1/R1+1/R2+1/Rn=1/Req Series...

I'm in year twelve (in New Zealand, equivalent to 11th grade I think) and physics this year seems much harder than it was before. I usually got the equivalent of B's in physics last year, so I wasn't particularly great, and I want to get more A's this year (as eventually I want to be a...

http://img69.imageshack.us/i/circuitf.jpg/ Can someone explain what was done to go from Figure 4 to Fig 5? I tried source transformations but I cannot simplify it to that.

1. Find the equivalent resistance of the circuit as shown in the diagram below; where R1 = 1 Ω, R2 = 2 Ω, R3 = 2 Ω, R4 = 4 Ω, R5 = 1 Ω, R6 = 1 Ω, and R7 = 2 Ω. http://img21.imageshack.us/i/prob06v2.gif/ http://img21.imageshack.us/i/prob06v2.gif/Homework Equations R(parallel) 1/R(total) = 1/R1...

http://img571.imageshack.us/img571/3774/circuitb.png Uploaded with ImageShack.us For my a level homework i have to find the equivalent resistance in this circuit, i don't want anyone to do my homework i would just like to be pointed in the right direction. We have been doing a bit about...

A 20g lead bullet at 30°C and moving at 350m/s embeds itself in a wodden block. If 70% of the initial kinetic energy becomes internal energy of the bullet, what is its final temperature? My attempt: Ek = (mV^2)/2 = 1225J 70% of this energy = 857.5J So the available energy to heat...

small signal equivalent circuit model for the HJFET?? hello all, Looking for small signal equivalent circuit model for the HJFET. can someone knows ? Please help me it's urgent... Thank you in advance, N

Can someone please explain why the following three definitions for the norm of a bounded linear functional are equivalent? \| f \| = \sup_{0 < \|x\| < 1} \frac{|f(x)|}{\| x \|}, and \| f \| = \sup_{0 < \| x \| \leq 1} \frac{|f(x)|}{\| x \|}, and \| f \| = \sup_{\| x \| = 1}...

Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=32837&stc=1&d=1299373667 Determine the Thevenin equivalent circuit parameters, VTh and RTh, referred to terminals A and B of the circuit shown below? Homework Equations The Attempt at a Solution My...

Equivalent spring constant... Homework Statement This is a general doubt i have...when two springs of spring constants k1 and k2 are connected in series the equivalent k is given by 1/k=1/k1+1/k2 and when they are in parallel it is k=k1+k2...Now in these cases do we assume that the natural...

Homework Statement Find the equivalent resistance of the circuit as shown in the diagram below; where R1 = 4.0 , R2 = 3.0 , R3 = 1.0 , R4 = 3.0 , R5 = 2.0 , R6 = 4.0 , and R7 = 1.0 . [Ohm] Homework Equations Parallel and series resistance equivalence Req= 1/R1 + 1/R2 + 1/R3 ... etc...

Homework Statement I need to find the Thevenin equivalent of the circuit shown: I found the open circuit voltage (VAB) by noting that VAB = V3 and used the voltage division V_{AB} = V_s\left ( \frac{R_3}{R_1||R_2 + R_3}\right ) = 12\V I am having a little trouble finding the short circuit...

1. find the equivalent resistance across points a and b The Attempt at a Solution I've used kirchhoff junction and loop rule to get a whole chunk of simultaneous equations but i can't seem to lay the finisher. Assigning I_1 to I_4 in the clock wise manner starting from the 5...

Homework Statement What is the approximate equivalent resitance of the five resistors shown in the circuit show below? http://img515.imageshack.us/i/circuit.png/Homework Equations The Attempt at a Solution How do I solve this without voltage given?

Show that ... if equivalent to ... Homework Statement Show that ∫e-t2sin(2xt)dt (bounds: 0,∞) = e-x2∫eu2du (bounds: x, 0) Homework Equations THEOREM X. Let the integral F(x) = ∫f(t,x)dt (bounds: c, ∞) be convergent when a ≤ x ≤ b. Let the partial derivative ∂f/∂x...

Homework Statement The equivalent capacitance of the capacitors shown in the figure is 9.23 MicroF Homework Equations http://upload.wikimedia.org/math/2/f/5/2f5b978fd081ea63e204909addf3d028.png http://upload.wikimedia.org/math/f/a/3/fa34ce461e6988fd973081401cc9790c.png The...

Homework Statement Find the equivalent resistance between points A and B shown in the figure . Consider R1 = 4.8 Ohms, R2 = 2.5 Ohms, R3 = 3.7 Ohms, R4 = 4.4 Ohms, R5 = 4.1 Ohms, and R6 = 6.4 Ohms.Homework Equations The Attempt at a Solution I got 9.33 by adding resistors 3,4,5 in parallel...

Homework Statement Find norton equivalent circuit Homework Equations Rn=Rth The Attempt at a Solution Ok i got my R(n)=34 ohms because after you turn off independent sources the resistors are in series, then I short circuited a to be and I'm trying to use mesh analysis to solve...

Homework Statement Write down the node-voltage matrix equation for the following circuit. Hence find the total power dissipated. (Hint: replace the emf+series resistance(s) by the Norton equivalents.) Homework Equations n/a The Attempt at a Solution The problem I'm having is that I...

Homework Statement The equivalent capacitance of the capacitors shown in the figure is 9.26 uF http://session.masteringphysics.com/problemAsset/1122585/1/Walker.21.58.jpg Homework Equations Cseries = 1/Cs = 1/c1 + 1/c2 + ... Cparallel = Cp = C1 + C2 + ... The Attempt at a...

Homework Statement Homework Equations The Attempt at a Solution I am not getting this at all. I know that I need to calculate the open circuit voltage Voc and the short circuit current Isc. I really have no idea how to find Voc. There is some conceptual leap I need to make...

Homework Statement Find the equilivant resistance in the wheatstone bridge circuit. Here is a picture: http://sub.allaboutcircuits.com/images/00485.png Homework Equations The Attempt at a Solution I know R1 and R2 are in parallel and R4 and R5 are in parralel but I'm getting confused with R3...

Homework Statement Find the equivalent resistance across Rab Homework Equations Series: Req=R1+R2...Rn Parallel Req=(R1 * R2 *...Rn) / (R1 + R2 +...Rn) The Attempt at a Solution its the geometry that is throwing me off in this problem. Starting on the left side, I want to put...

Homework Statement The equivalent resistance between points A and B of the resistors shown in the figure is 27Ohms. Find the value of resistance R. Here is the diagram: http://session.masteringphysics.com/problemAsset/1122575/1/Walker.21.36.jpg Homework Equations Rseries =...

Homework Statement Two masses, having mass moments of inertia J1 and J2, are placed on rotating rigid shafts that are connected by gears. If the numbers of teeth on gears 1 and 2 are n1 and n2, respectively, find the equivalent mass moment of inertia corresponding to theta_1. Homework...

Homework Statement Man, I stink at circuits. I have to simplify the 1st circuit in the image below to an equivalent resistance. I am almost there, but I am unsure of how to relate the remaining 3 resistances. In the drawing, a subscript Ri||j denotes the equivalent resistance of the two...

Equivalent length of of column ?? Homework Statement A Mild steel column has a cross section of 100 mm by 50 mm . Assuming a safety factor of 6 calculate the load that it can safely support? Homework Equations Rankines formula : W = Oc/K[1+a(AEe^2/I] The Attempt at a Solution...

Homework Statement Find the thevenin voltage and thevening resistance of the circuit. [PLAIN]http://img573.imageshack.us/img573/2525/thevening.png The Attempt at a Solution The posted answers for the question are 5v and 1k ohm. But I can't see how the thevenin resistance is 1k...

I will be going to university next year and I've really fell in love with the idea of working somewhere like the old Bell Labs. What I want to know is... Is there a modern day equivalent to Bell Labs (anywhere in the world) or have I created an unattainable dream, rooted in a long forgotten...

Hello everyone. I have a problem...I'm calculating natural frequency of a standing cylinder. In order to do that, I need the ke - equivalent spring constant of that cylinder. ke = (EY * s) / (h) EY is Young's elastic modulus for material cylinder's made of s is the cross section of...

For the digital cameras, is the zoom-in is equivalent to move forward the camera? My simple camera gives me 5 level zoom in, it has 3X optical zoom, but it takes me to press the button 5 times to reach the highest limit. Can I determine the forward distance of each zoom-in button pressed...

Homework Statement [PLAIN]http://img502.imageshack.us/img502/6081/93069832.jpg

I've been trying to create a program that takes a user supplied indefinite integral and integrates it using the methods I have been learning in my calculus class; substitution, integration by parts, trig substitution, partial fractions, elementary anti-derivatives, etc. I've been trying to use...

Find the Thevenin Equivalent circuit between A and B the circuit is in the attachments... i don't know how to start and don't know what it meas "Between A and B" and i never encountered a problem with a dependent source. Thanks...

The proton activation data file/s contain the target and product data plus the cross sections at a range of energies, so the reaction rates can be calclated. The only neutron cross section data files I have found have just the overall cross sections. Are there any files available that give the...

I'm currently looking to use a nonparametric alternative to the parametric repeated-measures with a between-subjects variable. I'm aiming to investigate three sets of subscores of a test taken by three groups of participants. I was initially using the parametric repeated-measures ANOVA using the...