Output Definition and 1000 Threads

A man runs up 1576 steps in 9minutes 33sec. If the height gain of each step was 0.20m, and the mass of the runner was 70.0kgs, what was average power output during climb? I used P=W/T & W=FD W=70kg(1576)0.20=22,064J P= 22,064J/573s = 38.5 W answer given is380W What am I missing?

Homework Statement The problem is gives an ideal op-amp and wants me to find the output current of it. Here is a picture of the problem. http://i.imgur.com/NfO6q.png Homework Equations vp=vn in=ip=0 The Attempt at a Solution So what i did is take KCL at the Vn node...

Are photons in the laser output beam mutually independent and can the multi-photon output be described as the tensor product of individual photon states?

I am trying to model light that (1) exits a multimode fiber (2) passes through a cylindrical lens system and (3) enters a multimode fiber (and yes I know that a cylindrical lens system is not ideal for fiber coupling). The radius of curvature for each of the cylindrical lenses in my system...

Homework Statement Here is the problem: http://img507.imageshack.us/img507/6488/unled2b.jpg What is the open circuit output voltage, Vout? Estimate the short circuit output current Can someone explain to me how to do these. Homework Equations Honestly... no idea. I know V=IR and all that...

Hi Shaft A has variable RPM, getting input from some rotating element (say X), ranging from 0 to 2000. The RPM of X cannot be adjusted or controlled. A has to transfer the rotation with limiting RPM of upto 400 to Shaft B. Is there a way to limit the RPM using a mechanism such that at...

We were assigned a problem in class, but because it was on guest lecturer material, I am unclear of which given numbers and what equations to use. I do know I am supposed to use: η=TH-Tc/TH But I am confused as to why I have been given 4 variables ...Please Help! Here is the question [1] You...

Hi, I have a questions about generators and how they generate electricity. Why is that some generators generate large electrical power running at 3600 rpm, and yet some generate little electricity running at the same speed? And why are low rpm generators (e.g. 900 rpm or less) able to...

Hi all, I'm writing a program in FORTRAN to calculate neutron flux in a reactor, but when I try to get a numerical output it simply says NaN. Anyone know what this means or how to fix it? Code is below, and this is happening on the flux2(N) output on the last write statement. Thanks...

Homework Statement : Q.If a power plant burning 10,000 metric tons of coal per day with 10% excess air emits stack gas containing 100 ppm by volume of NO, what is the daily output of NO? (Assume coal is pure C). The attempt at a solution: A. C + O2 → CO2 (10000 metric tons of C)...

Is it safe to loop the inverter's output neutral to loop with the mains neutal?? Guys, I need a help on this. I thought that it is rather safe to loop one of the output terminal of the inverter to loop with the mains supply inverter, so that there doesn't arise the need of extra neutral wiring...

Homework Statement Humans have about v = 60 cm3 of blood per kilogram of body mass and blood makes a complete circuit in t = 20 s seconds. For a human body of thickness 0.2 m and height 1.8 m, estimate the change in power output of the heart when the body is standing up on a horizontal...

I'm currently studying transistor amplifiers and It is not entirely clear how impedance relates to amplification. For the emitter follower configuration, the book I'm reading implies that low output impedance means high voltage gain and, for any amplifier in general, high input impedance is...

Hello. I am a physics student working on research project which involves Fortran 95 code. I am very new to Fortran but I do have an intermediate knowledge of Java. The task I am attempting seems like it should be very simple but there are many subtleties to learning a new language that are...

Hi all, I have a problem with a VSD at work that's been confusing. I am a field service engineer for an oil service company, my line of work is in electric submersible pumps (ESP). The ESP motor is a 3 phase induction motor. Power here is 380V 50 HZ.We were using a VSD for motor control. The...

the general form of state space output is y=cx+du which means that output is linear combination of state variables and inputs my question is can we write output in this form when our output is not combination of state variable for example in rlc circuit state variables are vc and IL now if we...

Homework Statement Hello all, there has been some debate in my class as to the output waveform for the following circuit: Others say that the output will always be zero.

Hi, I am doing my Extended Essay in Physics(so yeah, I am doing the IB). I am really interested in taking up electrical engineering at university, and so, I had done an EE in piezoelectricity. I have taken the crystal from a barbecue lighter and connected it to a vernier( a machine that can...

I have a problem i am trying to solve, the question is; Calculate the velocity ratio for this system. If the work put in is 3000J, calculate the useful energy output. The system in question is a Hydraulic lifting frame upon which crates are placed. It is lifted with a hydraulic ram which is...

Homework Statement A bicyclist coasts down a 7.0 degree slope at a steady speed of 5.0 m/s. Assuming a total mass of 75 kg (bicycle plus rider), what must the cyclist's power output be to pedal up the same slope at the same speed? Homework Equations P=Fvcos\theta K=\frac{1}{2}mv^2...

Hi, If I powered a permanent magnet generator like one found in a wind turbine, with let's say with a 1/2 hp A/C motor for example and directly coupled them together or used a gear reducer to increase the torque and rpm's, would the output watts created by the generator be greater than the...

Hi, Just a general question. For an ideal opamp, does any current flow from its output terminal? What is the reasoning behind whatever the answer is? Thanks

Hi From http://en.wikipedia.org/wiki/Carnot_cycle "Reversible isothermal expansion of the gas at the "hot" temperature, TH (isothermal heat addition). During this step the expanding gas makes the piston work on the surroundings. The gas expansion is propelled by absorption of quantity Q1 of...

I am trying to make a capacitor by connecting + and - to the electrodes between two parallel plates. There are + and - and Ground in the power supply which of these should I connect to the two plates and how does it work. thanks

Homework Statement Hi, I have a basic MOS common-drain amplifier as described below: - Drain connected to 5 V DC - Gate connected to an AC source on top of a 3 V DC source - Source connected to a 200 uA current source with a resistor R connected in parallel. The parallel connection goes...

hi i want to find the output impedance of the following cct so i can perform pi matching on it but i don't know how to find it using lt spice please help! added schematic

How to find power required for adiabatic compressor? Problem - Air enters an adiabatic compressor at 20 C and 1bar. The volumetric flow rate of air is 1 m3/s and it exits at 200 C. Determine the power required if the isentropic efficiency of the compressor is 80%. Density of water = 1000...

Homework Statement Suppose that we have a linear time invariant system with a system function H(s) = \frac{s+1}{s^{2} + 2s + 2} we want to find the output of the system when the input is x(t) = e^{\left | t \right |} The Attempt at a Solution what I tried to do is find the laplace...

I have a feeling this question has a very simple answer, yet I cannot find it anywhere online. Let's say that I have a data set that represents and evenly-spaced sample of a function, taken uniformly over the interval (a,b) \qquad a,b \in \mathbb{Z} I perform a discrete Fourier transform to...

If a TEM00 output laser source (regarding both cases of single frequency vs multifrequency) is used as input into a multimode optical fiber, is it possible for the output of the optical fiber to be multimode?

Homework Statement Hello all, I'm new to PF..Pls help.. I'm stuck in the following query. I've MATLAB commands as follows: Hv=[1,2,3,4,5] for i=1:5 tspan=[1 30] h0=Hv(i) [t,h]=ode45[expression] plot(t,h) end And here i need to see induvidual plots of my 5 results..I...

Homework Statement I have a trouble understanding what would be the output when for example we say let's input the signal x(k*n) or x(n-n0) to the system... this has given me problems when having to solve systems for which I have to check the property of time invariance suppose we have a...

Homework Statement The question wants us to determine what the power output of a 2.32 GHz geosynchronous satellite that has an antenna gain of 18 dB be for a mobile receiver that is operating with an effective antenna gain of 3 dB in order to achieve the FM threshold (6 dB).Homework Equations...

in regards to power adapters, mainly the brick-type ones that come with laptops and external hard drives, how is the output current greater than the input current? for example, i see a laptop power brick with the following: input 100-240V~1.7A 50-60Hz output 18.5V == 3.5A 65W how...

SOLVED Homework Statement Very small dimensions-those on the atomic scale-are often measured in angstroms. An angstrom is represented by the symbol ? and corresponds to a length of 10^-10 meter. Create an inches-to-angstroms conversion table as follows for values of inches from 1 to 10: Use...

Hello. I am using the Smooth.m mathematica package on a large set of paired data points. Occasionally, instead of getting a number in my output array, I end up with something like this: 1. (0.861515 + (58 "")/2379) In the output window, the quotes are not visible, but when I copypasta it...

Hello, everyone There is a control theory problem that i would like to ask for help here. Suppose a very simple nonlinear system as follows x' = u y = (2-cosx)*(2-cosx) how to find a control law u that makes the output y can track a constant asymptotically, of course the x should...

Hi, Here goes: Problem I'm having trouble getting my PIC18F45J10 to light up an LED. I have a LED-res-ground connected to RC7 (pin 26). My code is set to configure PORTC pins to be output and then set the RC7 bit. Upon debugging, the following is shown: TRISC=0x00 PORTC=0x80...

Hi guys I am new to matlab. I have a question in how to pick up matrix elements as a output of a function. function result=test(E) result=[1,2,3;4,5,6]*E; For each E, test(E) will generate a 2x3 matrix. I wonder how to pick up the matrix element,say test(2)(1,3). When I type...

I am working in MATLAB and have created a function, which I will call in the command window. Here is the code: function y=intensity(img) tic im = imread(img); R = im(:,:,1); G = im(:,:,2); B = im(:,:,3); r = im2double(R); g = im2double(G); b = im2double(B); rgbsum = r + g + b; intensity =...

Homework Statement Fan Motor Output: 0.172 kW Propeller Fan Compressor Motor Output: 2.9kW DC Inverter-driven Scroll Voltage: 208/230, single phase What I need to find is the FLA for each fan motor(2), and the FLA of the compressor motor. Total MCA = 32A Homework Equations...

OK race fans, I bought a pancake air cylinder from Mcmaster carr. Rated at 670 lbs at 100 psi and it fits under the rear wing mount and when compressed air is applied , the cylinder lifts the rear half of the race car. Problem is at the garage at the race course. The air compressor in the...

Hello Everyone, I have a question about how power amplifiers output their power to 3 phase motors. I am using a copley xtl power amplifier to power a 3 phase motor, i want to use a relay to interrupt that motor current but I am not sure how to size it. If the peak output of the amplifier is...

What is the truth? I am evaluating some UPS with main subject output power factor 0.9 ... as example on on the company data sheet of BPC stated 0.8 PF for all 300 range http://www.bpc-ups.com/uploads/tech_spec/134.pdf ... but the local agent has sent to me the following letter stated that...

Hi All, I am doing the experiment with photodiode and laser light. The laser source I used is 4.5mW infrared laser with OPV382 and the PD used is SFH206 with 0.6A/W intensity. I put the the laser source and the PD at 10cm apart. Then 1ohm series resistor is put at PD circut to measure the...

Hi, I'm new here and I apologize up front if my terminology is incorrect. I've been a Civil Engineer for over 30 years, but am very far from an expert in electrical. Sorry if this is an elementary school level question for you guys! I am hoping someone here can either give me a hand or point me...

I have a question regarding the effective dc output resistance of dc power supplies. For a "good" power supply, should this internal resistance be large or small? Well, I used to think that a good power supply should have a small internal resistance, so it would maintain a constant terminal...

Homework Statement Find the output voltage vo in the following circuit Homework Equations V = IR The Attempt at a Solution Ok well I've been going over a couple more questions before my exam in introductory circuit analysis and here's another one I've never really seen...

Hi guys, this is my first post in this forum so I hope I get some help. My question is: can an output voltage of ANY circuit be larger than its input/source voltage. I realize that in DC circuits, this is not possible because of KVL. Since the total voltage around a loop has to be zero and...

In the circuit I accidentally connected output of the amplifier to the ground. Could it damage my chips? All components of the circuit are already on the PCB, amplifiers are powered from 3V and -3V batteries. My top layer is grounded and there is a possibility that soldering the chip we...