Output Definition and 1000 Threads

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

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...

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...

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...

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 =...

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...

Homework Statement a) An electrical device stores energy in a 1.25 x 10^-4 F capacitor at 220 V. How much energy can be stored in this device? b) If 1.25 J were released from capacitor in 0.25 second, what would be its power output? I believe I solved (a), but I cannot find out how to...

Homework Statement a person ran 100m in 9.69 seconds. assuming the acceleration was constant, what was his average power output during that run in watts? Homework Equations P=Fd/t or P= change in energy/t The Attempt at a Solution i don't actually know where to start... i know i...

Sir/Madam, what is out put of glucose+water?is it possion? can i store this in packets? how long? if i combine "water+glucose+citric acid+carbon dioxide" what's the output? which taste i get?

hi, I am working on a small solar cell project for which i bought two small solar cells panels of 6volt each producing current of 5.263milli ampere in combination. I want to know that how can i calculate the values of solar cells output in kwh, on the output i have placed two bulbs of 3 volts...

Hello, I have currently written a Fortran 77 simulation program that I need to display graphically for each timestep. So far it calls the system to have gnuplot open an include file that has the gnuplot script to plot from my data files and produce a jpeg. What I would like to do is have it...

So the MOSFET's output current in a simple buck converter with a PWm a driver and a MOSFET and LC circuit. The Inductor's saturation or Irms current limits the MOSFET's current output, correct? I heard that if it exceeds saturation current that the MOSFETs could be damaged. is this true...

Hello, :smile: I did an experiment on full wave rectification using center tap transformer. The transformer read: Input 220V, Output 12V, 12V. I used two diodes and 1 micro farad capacitor. As you see capacitor's capacitance is very little so it didn't effect the overall output because I...

Hi, :wink: In the link given below circuit #1 and #2 are same except that they have opposite polarities for the battery V. On the left bottom there is output waveform after the clipping. In the beginning I was thinking that output for both circuits, #1 and #2, will be same. But now I am...

Hi all. I need more brain power than I can muster. This is a two part question for a software function I need to write. I'm trying to 1) pre-determine how many n% unique ways there are to intermix items from various lists and 2) produce output of only combinations that are n%...

I saw an example where the work of a heart was found to be 2 watts based on the height of a person and the liters of blood that it pumped throughout the day. Since we have closed circulation systems (unless we have a cut, annerism, etc. ) I thought height would not matter, and in order to...

I have designed an opamp based on thfollowing square wave setup http://www.national.com/ds/LM/LM124.pdf on page 11. I want to know what i would have to adjust to lower the frequency to the range of 10 hertz, it has a 5 volt input and the frequency range is at 10 Ghz I believe. any help would...

Homework Statement Hello, I did the following measurement: A piezo element (mass approx. 50 gram) is fixed onto a vibration shaker The force exert on the piezo, 0,124 N (rms) is measured with an impedance head The vibration frequency (sinusoidal signal) is 142,4 Hz The acceleration is...

Basically as the title says, what type of fusion would give the highest number of neutrons for a given amount of power. Also am I correct in assuming that most fusion methods will always produce more neutrons than other neutron sources such as americium-beryllium? (There are probably some...

Homework Statement Write a code with the following functions: Function 1: print a list of 4 different type variables input and output: character, integer, float, and double. Function 2: prompt and return an input character. Function 3...

Homework Statement Calculate the output impedance of the emitter-follower circuit called a pass transistor. Assume that beta=200 **See attached diagram** Homework Equations The Attempt at a Solution Not really sure how this works, I thought it would just be 1k cause that is the...

Homework Statement Hi! I'm currently working on my school project, for which I've constructed a tesla turbine, and to complete it I'll have to make some calculations on the efficiency. As I don't want a efficiency result that depends on a generator I've decided to mount a flywheel...

[PLAIN]http://img705.imageshack.us/img705/1016/20481574.jpg Is there any way of reading the intercept and the slope of the least squares regression line from the R output here? Also assuming the simple linear regression model Y=\beta_0+\beta_1 X + \varepsilon where \varepsilon \stackrel...

i am trying to plot the output of a function given the transfer function and an input. however, i am having trouble with trying to express the input as a function in MATLAB my transfer function is m = 1; b = 2; k = 1000; num = [ 1000 ]; den = [ m b k ]; transferfunction = tf(num, den) so it's...

Hi all. I have a 4 input circuit (ABCD). I have 7 outputs that accompany this circuit. Now, I have tools (like Karnaugh maps) to solve for Standard Sum of Products (or Product of Sum) form for individual outputs. I have the minimum of each output based on the Karnaugh map. However, I want...

Develop an application that reads city, state, and population from a text file. Example input census file: Jamestown FL 50000 Domville CO 10000 Jennyboro FL 30000 Lillyville CO 5000 If the population of the city is greater than or equal to 50,000, write the city information to a text...

Homework Statement A car battery with 12V EMF charged to 120amp hours. Assume potential difference across terminals is constant. How long can the battery deliver energy at a rate of 100Watts. Missing is current (i), internat resistance (r), and real voltage (Vr)Homework Equations (Amp...

Develop an application that reads city, state and population entered from the user and writes this information to a file. The application should continuously prompt for this population information until terminated by the user. Example file: Jamestown FL 50000 Domville CO 10000 Jennyboro FL...

Hi there, I have completed my analysis in BEM. The results gives me velocity potential in form of 37954305E-04 +1.58625295E-06 +2.10275811E-07 +... I have real scattering values, imaginary and absolute scattering values in this form. I am new to the method and from a different...

Hello all, I'm an electrical engineering tech student working on a little side project and I can't find anything to help me with a crucial part. I have a gauge cluster out of an automobile that I want to interface with a computer to used while playing a racing game. I have a computer...