Equivalent Definition and 1000 Threads

Bohm's deterministic theory was designed to be equivalent to standard QM, but what I'm not sure about is whether that includes Von Neumann's rules. Von Neumann's rules for the evolution of the wave function are roughly described by: Between measurements, the wave function evolves according to...

Hello all, I am trying to find an equivalent spring for a combination of a spring with spring constant k1 & pre-sompression of x1 and a diaphragm of stiffness k2. Refer to the attached figure. Please help me in understanding whether this combination will be in series or in parallel. Thanks

I read the following statement in a book: "if polarity of m number of cells out of total n number of cells are connected in series with external resistance R is reversed then equivalent emf of such combination of cells is given by Eeq= (n-2m)E (where, each cell has same value of emf= E" I...

Homework Statement The question is to draw a magnetic equivalent circuit for this http://postimg.org/image/kek5fgr9z/Homework Equations The reluctance is given by ##R=\frac{l}{μ_oμ_rA_c}## The Attempt at a Solution I am confused about the dimensions of the circuit, and also about what...

OK, this is embarrassing, but I never looked carefully at this elementary point. We say that if p implies q P is the set of all things for which p is true Q is the set of all things for which q is true then Q ⊆ P. Also that the set of all things for which p&q is true equals P∩Q But p & q...

A worker in a nuclear power station is exposed to 3∙0 mGy of gamma radiation and 0∙50 mGy of fast neutrons. The radiation weighting factor for gamma radiation is 1 and for fast neutrons is 10. The total equivalent dose, in mSv, received by the worker is A 3·50 B 8·00 C 30·5 D 35·0 E 38·5. The...

Homework Statement An engineer is trying to model a lithium battery with a thevenin equivalent circuit. She first connects a voltmeter across the battery and gets a reading of 3.7V. She then connects 0.5 Ohms resistor across the battery terminals. The reading now drops to 3.2V. Draw the...

Could you solve this?

There is an analogy between electric and gravitational potential energy. ## U_g = \frac {GmM}{r}## ## U_e = \frac {kqQ}{r}## What is the analogous formula in magnetostatics? Thanks...

Homework Statement What is the equivalent resistance between points a and b in the Figure shown. Homework Equations Equivalent of two resistors (e.g R1 and R2)= R1*R2/(R1+R2) Equivalent of two resistors (e.g R3 and R4) = R3+R4 The Attempt at a Solution Step 1: 6, 12 and 4 ohm resistors...

Its given in my textbook that equivalence of gas = (volume of gas) / (Volume of 1 eq. gas at NTP) How do i calculate volume occupied by 1 equivalent of gas? Example: What would be the volume occupied by 1 eq. of CO2 (Its given 11.2l in my book) Is there a formula for this?

Homework Statement Prove that if ##(X,d)## is a metric space and ##C## and ##X \setminus C## are nonempty clopen sets, then there is an equivalent metric ##\rho## on ##X## such that ##\forall a \in C, \quad \forall b \in X \setminus C, \quad \rho(a,b) \geq 1##. I know the term "clopen" is not a...

Homework Statement Solve the thevenins equivalent of the circuit Homework EquationsThe Attempt at a Solution I think this is wrong but I got 750 ohms for my Rthevinin and 2.3V for my Vthevinin. I checked using KVL with the load resistor set to 500 ohms and get a current of 0.0037A through...

Things space contract and time dilate in SR. And also things space contract and time dilate near heavy objects in GR, right? Particles are accelerated towards heavy objects in GR. My question is does the the acceleration due to gravity produce a frame of reference equal to some speed which...

Hello, is there a formula or technique to calculate the equivalent inertia of an engine? I think I will have to add up all the inertias of everything else rotating inside it but it has so many components like cams, followers, pulleys, water pump, crank, flywheel etc. What sort of effect will...

Homework Statement Determine the inductor current i(t) for both t<0 and t>0 for the circuit shown in the attached document"Circuit 1. Homework EquationsThe Attempt at a Solution Before t=0, i=(25)/(3+2) = 5A After t=0, i(t)=i(0)e^(-t/tow) tow=L/R=4/(6/5) However, the...

Homework Statement In the circuit shown, R1 = 0.810 Ω, R2 = 8.10 Ω, R3 = 81.0 Ω, and R0 = 810 Ω. See attachment Calculate the equivalent resistance of the circuit when a 7.70 V power supply is connected between points A and C. Calculate the current through R0 and R1 Homework...

1. The element of a heater kettle has a constant resistance of 105 ohms and applied voltage of 240V. 1. Calculate the time taken to raise the temperature of water from 15 degrees Celsius to 90 assuming that. 80% of the power input to the kettle is usefully employed. I worked this out and got 11...

Hi, I'm working on the decision version of the Knapsack optimization problem that asks whether there is a subset of the items with a total value of at least V and where the total weight of the items is at most W. I'm looking for an equivalent problem P for this version of the knapsack...

Homework Statement The water equivalent in kg, of a calorimeter having a mass of 0.3 kg and a specific heat of 0.2 is Homework Equations q=cmT The Attempt at a Solution I wanted to set cmT = cmT for the water and calorimeter, but I don't know what the equilibrium temperature is. So what do I do?

Homework Statement The question is in the photo attached. Homework EquationsThe Attempt at a Solution I have found the Thevenin voltage as the 10 and 20 ohm resistors are in series (30 ohms) and the 50 and 40 ohm resistor are in series (90ohms). The 30 and 90 ohm resistors are in parallel so...

Hello there friends, I'm new here. I'm in my second semester of Computer Science Engineering. I've always loved Maths but was never quite great in Physics in school. I Keep getting this feeling that the current books I'm using aren't delivering the sufficient depth (BS Grewal and Erwin...

Hey forum! My name's Patrick. :biggrin: I've been staring at this FOREVER, but I cannot seem to come up with an answer on my own. I've taken 1.5 semesters of physics, but I cannot figure this out. The reason I posted this in Chemistry is because I realized that the R constant can be written as...

Homework Statement This is a sample problem. I'm trying to figure it out before I do the actual homework. The issue is, the way to figure it out is not included in our notes. I'm absolutely lost (math isn't my strong point) I've also included my attempt at how I think it should be done below...

Homework Statement I'm having problems with PF's cut and paste images. They are not showing up on the actual webpage only on my editor. See these: http://i.imgur.com/mKfn27m.png http://i.imgur.com/jCO2JRM.png http://i.imgur.com/oUWFsuI.png I created the above problem by modifying this...

Hi guys, Sorry if all you guys think this question is too easy. But I have a hard time to understand how to group the resistor. I suppose to find the the thevenin and Norton equivalent circuit. This is what i think about the combination of resistor. Req1= RL+1k Req2= Req1 ll 3.3k (3.3k after...

Homework Statement Find the equivalent resistance at terminals a-b of the circuit. Homework Equations Resistors in parallel : 1/Req = 1/R1 + 1/R2...+...1/Rn Resistors in series: Req = R1 + R2...+...Rn The Attempt at a Solution [/B] The resistors are in ohms and the answer is 32.5 ohms. The...

Homework Statement Determine the Thevenin equivalent with respect to the terminals a,b Homework Equations Rth=Voc/Isc The Attempt at a Solution I'm doing this practice problem and I calculated the the short circuit current below: 500uA*100ohm/(100ohm+1310ohm)= 35.460 uA since 80*ib=current...

Homework Statement Find the equivalent resistance Rab for each circuit given here (resistance values have been omitted so I can focus on understanding the concept, but I can supply them if requested). Homework Equations This problem expects me to know how to combine resistors in...

Homework Statement Ignore the internal resistance of the battery and assume it is merely a battery. Calculate the equivalent resistance of the circuit. Homework Equations 1/Req = 1/R + 1/R ... (parallel) Req = R + R ... (series) The Attempt at a Solution I know this is fairly simple but I...

All the youtube links are time stamped 1. Homework Statement Homework EquationsThe Attempt at a Solution I wrote it out the operator expressions each by hand and got the same result but I don't understand how he is able to just eyeball it. I'm trying to develop some intuition. a. To start...

Homework Statement http://oi57.tinypic.com/263tqvr.jpg I decided to try using mesh currents for thisFirst mesh is IA, second IB, third, ICSo I have the equations IA = 500 μA 1310 IB + 100(IA - IB) = - 4*10-5V2 IC = -80IBAre these equations correct so far? I get the feeling they're not

Homework Statement Calculate the equivalent resistance between A and B.[/B]Homework EquationsThe Attempt at a Solution I solved this problem by using wye-delta transformation. Is there any other method to solve this? The speciality in this circuit, I noticed, two of resistances are 0.[/B]

I read Siskel's and Ebert's reviews of movies from when I was 12 years old until their deaths. I found the reviews to be very interesting. The closest thing to an equivalent of Siskel & Ebert's reviews of movies to novels that I know of is amazon.com. However, amazon.com reviews of novels are...

Homework Statement I am to find the thevenin equivalent circuit without the load resistor (to the left of terminals a &b Homework Equations From class notes: 1- Remove the load resistor 2- find the open circuit voltage across a & b 3- Remove all voltage sources (replace with short circuit)...

Homework Statement I have that, for n ∈ ℕ, (-6/π) ∑n even (cos(nx))/(n2-9) is equivalent to (-6/π) ∑∞n=1 (cos(2nx))/(4n2-9). I don't understand how the two sums are equivalent to each other. Homework Equations I honestly have no idea what may be relevant, other than what is above. The...

I am reading Paul E. Bland's book, "Rings and Their Modules". I am trying to understand Section 3.2 on exact sequences in Mod_R and need help with the proof of Proposition 3.2.7. Proposition 3.2.7 and its proof read as follows:I am having trouble in understanding the proof that condition (2)...

I'm curious about time dilation sizes of below 4 situations. Please assume I'm observing the situations far away in zero gravity. And please ignore all SR effects, just focus on GR. http://dishdev.me/data/timedilationq.png Equivalence Principle says acceleration and gravitational fields can...

The problem: Rumford observed that when one horse turned a cannon bore for about 2.5 hr the temperature of 27 lb of water that was initially ice cold (i.e., near 0°C) rose to near boiling hot (i.e., near 100°C). Given that one horsepower is 33,000 ft-lb;min, that 1 kg weighs 2.2 lb, and that 1...

1. Homework Statement Find the equivalent resistance Homework Equations Is=I1=I2=... Vs=V1+V2+... Rs=R1+R2+... Ip=I1+I2+... Vp=V1=V2=... 1/Rp=(1/R1)+(1/R2)+... The Attempt at a Solution Sorry the picture is sideways! Is this the correct method for finding the equivalent resistance? The part...

Homework Statement This is part of the online tutorial I'm reading: http://farside.ph.utexas.edu/teaching/em/lectures/node49.html I'm so confused about the notation of Dirac Delta. It's said that 3-dimensional delta function is denoted as \delta^3(x, y, z)=\delta(x)\delta(y)\delta(z) in...

Hey! :o I have to show that for each RAM program of time complexity $T(n)$ under the logarithmic cost function there is an equivalent RAM program of time complexity $O(T^2(n))$ which has no MULT or DIV instructions. Could you give me some hints how to show that?? (Wondering)

Hi everyone. I need some help with regards to a question on Thevenin's equivalent. I attempted to solve it in 2 ways but I got different answers when I tried to do it another way. However, I am not sure of my answer as I do not have the answer key at the moment. The picture below shows one of my...

I had some problems finding out an equivalent way to describe a particular gama source.We can get the original way describing the particular gama source in this file: "1.txt", as well as its model in this file:"model.jpg",with this describing way,we can get the distribution of gama flux like...

The Faraday paradox is a hard one to get ones head around and I was wondering if there is a similar scenario, involving an E field where there is / or is not an induced emf?

Hey PF, I'm having trouble seeing the bigger picture here. Take matrix A and matrix B. If B can be obtained from A by elementary row operations then the two matrices are row equivalent. The only explanation my book gives is that since B was obtained by elementary row operations, (scalar...

Hi, i was just wondering since cosx=1-(x^2/2) is there a similar formatted formula for sinx?? much appreciated :) :)

Many linear quantities have angular counterparts. Mass --> Moment of inertia velocity --> angular velocity acceleration --> angular acceleration force --> torque momentum --> angular momentum E = mc^2 --> ? = I ?^2 Even a loose analogy would do.

Homework Statement Find the Thévenin's equivalent. Homework Equations V=IR The Attempt at a Solution [/B] I'm not sure if I need to take into account the internal resistance. And also, is finding thévenin's equivalent just calculating Rth and Vth? I'm really lost sorry. Many thanks.

Homework Statement and the attempt at a solution[/B] I tried to find the equivalent sprint constant using two points of equivalence. The first is with respect to theta. The second is with respect to the datum x as shown in the images below. The two methods yield two different answers which is...