Output Definition and 1000 Threads

Homework Statement Rosie (mass 58 kg) pushes a box with a horizontal force of 170N (38.216 lb) at a speed of 16 m/min. What is Rosie's power output? Answer in units of W. Homework Equations Work/Time = Power MGH/T = Power .5MV^2 = Power The Attempt at a Solution 58(.2667...

Hello all, Im new to the site so please don't hurt me :blushing: ! My final goal is to measure linear speed of a pedal powered car, and send the speed wirelessly to my laptop which will record the speed profile. My problem is that I can't find a sensor that will measure angular...

How is high impedance output implemented in logic gates? If transistors(BJTs) are used to implement a Not gate, what would be the ckt when the output is high Z?

How do GM crops (both current and potential in the near future) compare with organic in terms of output per acre? How does it compete with such methods as Fukuoka Natural Farming, and other forms of permaculture?

Homework Statement A pump is to lift 8.00 kg of water per minute through a height of 3.50 m. What output rating (watts) should the pump motor have? Homework Equations The Attempt at a Solution I have no idea how to even start.

Hi guys, I am tryin to get my program to output multiple files with the name of the file dependent on a number of integer variables in the program, any help with this would be greatfully appreciated. Cheers

Is it possible to connect two alternators together to double the output voltage, is there a way to do this? Eg: Say two 12v Alternators connected to get 24v etc. Thanks

Hi, I'm familiar with tree traversal alogirthms, post,pre and in-order. If you give me a tree I can print out the specified traversal of that tree. However, one thing I can't do is build a tree from a given output. For example, on my last test, my prof gave me this Question: A pre-order of a...

Hey all, My bibliography is not showing up in the PDF output, and I'm not sure why.. The bib file is in the same directory as the the main tex file. I am using the command: \documentclass[a4paper,twoside,11pt]{book} \usepackage{calc} \usepackage{setspace} \usepackage{graphicx}...

Homework Statement The Sun emits electromagnetic waves (including light) equally in all directions. The intensity of the waves at the Earth's upper atmosphere is 1.5 kW/m2. At what rate does the Sun emit electromagnetic waves? (In other words, what is the power output?) The answer is...

A 2400 pound car ascends a 10 degree slope at 30 miles per hour. If the overall efficiency is 70 percent, the power output at 70 percent efficiency is 47.7 horsepowers. By the formula, Power=(force)(velocity) with 1 horsepower=550 ft*lb/s , the power output at 70% efficiency is 23.38...

Homework Statement A weightlifter is able to lift 250 kg 2.00m, in 2.00s. What is his power output? Homework Equations W=M x N P = W/Change t The Attempt at a Solution 250 x 2 = 500 (I thought that this was work) so then I divided by time (2.00s) to get power. The answer is not...

Homework Statement The rms output voltage of an AC source is 180 V, and the operating frequency is 90 Hz. Write the equation giving the output voltage as a function of time t. (Use t as necessary.) Homework Equations (\Delta v) = (\Delta V_{max})sin\omega t \Delta V_{max}= \sqrt{2}V_{max}...

Homework Statement You lift a 40 kg weight vertically 2 meters in 2 seconds. Your power output is ____. Homework Equations The Attempt at a Solution M = 40 kg A = 1 m/s F = ? I have no idea how to go further than this. Also, what is power abbreviated as? For example, force...

I have arbitrary input numbers, and an arbitrary output. I want a program to automatically give me a function (various constants and mathematical symbols) to convert from the input to the output. What's the best way of doing this? Are there any programs to do this for you, perhaps which use...

Homework Statement i'm doing an experiment about how the power output from fruit cell changes when it is heated up. i've put my results into a excel spreadsheet, but i don't know how to explain the relationship between the temperature and the power increase. all the relevant data and the...

Hi. I joined to ask this one question..but who knows maybe I will stick around and learn other things..lol... I bought an electric 12v anchor winch which is designed to be used with a 12v car battery on a boat. I intend to use it to hoist my bicycles to the ceiling of my garage. However, the...

Hiya, Question 1: (Main question) I bought a lux meter while understanding very little about how light is measured. I'm hoping to measure the output of a laser in mW. I assume it's possible to do this at least to an accuracy of about 10-20% which is all I need? If so, please could someone help...

Hello everyone, I have a question that I have been unable to find an answer to. I am interested in salvaging a vehicle alternator in an attempt to create a homemade generator. I understand that household electronics' needs are measured in watts, but I can't seem to figure out how to calculate...

i can't understand why i get such an output?? int array[] = { 45, 67, 89 }; //1st ine int *array_ptr = &array[1]; //2nd line printf("%i\n", array_ptr[1]); //3rd line the second line links the pointer *array_ptr with the value of cell "1" but in the third line it should have print...

I need to be able to print the output from my c++ program, which obviously comes up in a dos screen. Is there an easy way to print this without writing it into the code? Any help would be greatly appreciated.

Homework Statement A bicyclist coasts down a 7 degree hill at a steady speed of 5 m/s. Assuming the total mass of 75 kg, what must be the cyclist's power output to climb the same hill at the same speedHomework Equations power = force * distance / time force of gravity = mass * gravityThe...

Hello, I am working on a sound/light installation at the moment and was hoping that someone on here might be able to help me with a question i have. I would like to use the composite output from a DVD player to control the intensity and hue of LED light (or 3 (RGB) if need be). So...

Homework Statement The armature winding of a 200 volt, 4-pole series motor is lap connected. There are 280 slots and each slot has 4 conductors. The current is 4 amperes and the flux per pole is 18 mWb. The field resistance 0.3 ohm and the armature resistance is 0.5 ohm. The iron and friction...

A top fuel drag racer with a mass of 600.0 kg completes a quarter-mile (402 m) drag race in a time of 4.4 s starting from rest. The car's final speed is 115 m/s. What is the engine's average power output? Neglect friction and air resistance. I know: Power = Work/ change in time W = Force *...

Homework Statement Water flows into a nozzle at 3.00 m/s at a pressure of 1.31*105Pa. What should the ratio of input to output diameter be if the flow is to remain steady? What is the flow speed at the exit? Homework Equations P_{{\rm{input}}} + \frac{{\rho v_{{\rm{input}}}^2 }}{2}...

I am building a 2 to 4 decoder with 7408 And gates and need to put LED's on the output as indicators, active high. 2 questions 1. Would I put a current limiting resistor in series with the LED to ground or put the resistor and LED from the gate output to Vcc? 2. The LED draws 30mA at 2V...

For a real world problem, I've been puzzling over the trend to go after very light-weight rims for bicycles. My BS in physics hasn't provided me with solid answers. I am a bit rusty. I have found a feeling of increased stability when running heavier rims and attributed this to an increase in...

yellow line: output of photodiode which detects an LED blue line: output voltage to the LED newfile1: the file without measuring using average of the scope. newfile6: the file with using average of 32 times of the scope. How to filter the noise? It's noisy, I find it's ok to use...

Hi, I have a product that needs a 6v transformer. However all I have is a 12v output transformer. Can I use this? and is it dangerous? Thanks Fialor

I am looking for a cheap device to check sensor function, the sensor is detecting at 120 rpm and should give a 24v output. If there is a circuit i could build my self that would be great. Thanks.

can u explain what hapens output circuit is open and no current is flowing through output coil? isn't it that a large current flows through the input?and the wire burns...i know it doesn't hapen...but why?when there is no back emf in primary?

Hello all, Is there anyone out there who can help me out? I have developed a drive system for a generator, but... the big but... in need to know how to build the appropriate stator for it. Assume this is of the windmill electrical generating variety, where magnetic coils produce AC...

Homework Statement The Vdc of Full Wave Rectifier (with diode) with midpoint configuration has been found to be 2Vm/(pi) and Vrms = Vm/sqrt(2) How about the Vdc and Vrms value for the full wave rectifier but with bridge configuration. The difference is the the peak inverse voltage...

Hi, actually someone already posted the same questions but I thought it would be weird to continue from that post as I have a lot of questions of my own. The assignment requires me to draw a schematic diagram of a dual output dc power supply, identify the sub sections that make up the power...

Homework Statement Bob can throw a 500 g rock with a speed of 30 m/s. He moves his hand forward 1.0 m while doing so. a. How much work does Bob do on the rock? b. How much force, assumed to be constant, does Bob apply to the rock? c. What is Bob's maximum power output as he throws the rock...

Suppose you were given \sum_{i=0}^{2^n}\left| i\right>\left| f(i)\right>, is there something you can do so that when you measure in the computational basis, you have a large chance of getting a particular desired \left| i\right>\left| f(i)\right>?

hi everyone, I have recently started studying abvout control engineering, but am not getting a grasp on the basic idea behind controls. All the textbooks say that the output should track the input ideally , but why is it so? i.e if i give a step input to a system, the response should ideally...

Homework Statement The task is to compare the power outputs of solar cells, and solar panels. For solar cells, a circuit is devised to work out the power, solar panels a beaker of water is heated. Homework Equations Power=voltagextime Q=mc(delta)T Power=Energy/time The Attempt at a...

The question being referred to is question 3 on page 8: http://www.itute.com/physicsline/phys_trial_exam1_2008v2.pdf Answer referred to is Question 3 Area of Study 2: http://www.itute.com/physicsline/phys_trial_exam1_2008v2sol.pdf I don't understand why they get this answer. The answer I...

Is there a device that can read the positions of pixels on a monitor, may be just 6 key positions and give a real time output?

can anyone tell me how to solve for the voltage output in a generator and all the variables needed to solve it. What if I only have the RPM can I solve it? thanks

Several people (I think Arivero was one) have shown an interest in data on recent string publication and the question of how properly to interpret it----which basically comes down to whether you can predict. In sampling the string publication rate, we've never used this exact set of keywords. I...

Homework Statement I am asked to plan a practical to determine the power output of a solar cell, i.e how much light energy is converted toe electrical energy per second. Now I thought(obviously) to just connect voltmeter across it with an ammeter and use PVI, however thinking about it, I don't...

Im having some trouble interpreting the MCNP output file, more specificaly table 140 that describes reaction rates. The problem of course is that the acctual reaction rates isn't written but rather things like total colissions, collions*weight, weight lost to capture etc. How do I convert...

Im trying to get to grips with factors? and want to check my methodology, so: It all about solar panels..I've calculated how much power the cell will produced @ AM1.5 this is 73 mW cm-2 . Now my question is, i have to calculate the short fall by a factor of 1000 due when its used indoors...

Hello All, glad to be a part of this elite community, i have been following the forum threads for quite few days now, i am really interested to hear from Mr.Berkeman. here is my problem: we are facing a problem at the rectified output of our power supply, we have used a bridge rectifier to...

[SOLVED] Power output of nuclear battery Homework Statement An alpha emitter 210Po is used in a nuclear battery. The kinetic energy of the emitted alpha particle is converted into electrical energy at 5% efficiency. a) determine the initial power output (W) of the battery if it contains...

I'm building a power supply which is shown below : http://img397.imageshack.us/img397/3736/80123303ma0.jpg The tricky part is that i want a dual polarity PSU so i duplicate the circuit but this time i want to invert the output DC voltage as to be a negative one...what is the simplest...

Homework Statement investigate how output from photocell depends on distance from infrared point source am required to design a labratory experiment to investigate how the output from a photocell depends on its distance from a point source of infrared radiation. i am proposing my idea and i...