Output Definition and 1000 Threads

Increase reflector output? Greetings, I have been workings on a Solar Tracker. I have some small TV sat dishes that I am planning to cover with Mylar to create the reflector. After viewing some videos on YouTube I noticed that a larger dish produces more heat. Would adding a lens increase...

Homework Statement I have been asked to perform CFD simulations of a basic stainless steel cylindrical heat exchanger. I have to test a range of inlet temperatures and flow rates where external heat applied is constant. I wish to perform basic hand calculation to verify my results by...

Hi, I want to redirect output of mc6811 from terminal to a file.I have tried google search and did not find any solution for that.Can anyone help me?I appreciate your help. Thanks Rose

I am trying to drive a 5V DC motor using a MCU output. The motor is run directly off the +5V line which is down-converted from 18V using a TPS5430 Step-down converter. The MCU coding is basically that when the inputs are in the correct state, the output to the FET turns on for a number of...

Homework Statement A 48.0 kg sprinter, starting from rest, runs 46.0 m in 7.30 s at constant acceleration. a) What is the magnitude of the horizontal force acting on the sprinter? b) What is the sprinter's power output at 1.70 s? Homework Equations x=x_0 + v_0 t + \frac{1}{2}at^2...

How do you make a string repeat itself for a given number of times? For example, if I wanted to make "3y" print out "yyy" on the screen (it prints "y" 3 times because the number in the input is 3).. how would i do this using functions?

Homework Statement At a coal-burning power plant a steam turbine is operated with a power output of 491 MW. The thermal efficiency of the power plant is 39.0%. (a) At what rate is heat discarded to the environment by this power plant? ______ GW (b) At what rate must heat be supplied to...

HI, How do i feed the current information into micro-controllers ADC input to calculate the total power? Please help. I am using atmel tiny45 and its a boost converter output current i want to measure for output power. Thanks.

Is the thermal output, or rather electromagnetic output, of the Earth's core relatively constant? and if so, how does it compare to the output of other interstellar cores, say like mercury or the sun?

Hello... If i have a byte in a register in a PIC micro controller, how can i write a subroutine using ASSEMBLY which allows me to get serial output from this register to the output port of the micro controller?

I'm trying to figure out how to build a breadboard instrument using either push buttons or logic switches as they keys that will play each note. The issue that i am having is that I don't think finding all of the perfect resistor and capacitor combinations for each note is a good idea. So, i...

Hello, I have correctly defined my OPEN and CLOSE statements. When all of my WRITE statements with their associated FORMAT statements are at the end of the program I get the formatted output that I need. If I move one of the WRITE statements to the body of the program (within a particular...

Homework Statement The circuit below combines variable resistors R1 and R2 with fixed resistors to make a complex voltage divider. If the switch is closed and R1=8000ohms and R2 is 5000ohms, what is the output voltage. Homework Equations V=IR The Attempt at a Solution the...

I have a small problem regarding darlington transistor pairs. Lets say a source is connected to the coupling capacitor Ci and this source has an internal resistance of for example 10kOhms. When finding the Output resistance of the darlington, should the internal resistance of the source be...

Homework Statement I don't understand how the website below got the equations for the output and input resistances Homework Equations http://www.statemaster.com/encyclopedia/Common-collector

Homework Statement I am trying to make sense of some of the terminology. Basically i get that each industry in an input matrix is dependant on each of those industries to some specified extent in order for production. Is the output what each sector produces before we take into acount...

I tried connecting my solar cell, 7V/100mA to the ammeter. What I got is 1mA. Why? The voltage part is 6V, so I assume the efficiency should be at least around 6/7*100 %. But why is it only 1mA? I connected the solar cell straight to the ammeter. I need help fast. Thank you.

Homework Statement If a man has an average useful power output of 41.4 W, what minimum time would it take him to lift fifty 15.0-kg boxes to a height of 1.88 m? Homework Equations 1/2mv(final)^2 mgy(final) = 1/2mv(initial)^2 mgy(initial) P=W/Δt P=Fv The Attempt at a Solution...

Guys, I have a Lister generator that is capable of producing approx 5KW of power from an attached ST alternator. I am in australia so our standard power is 240v at 50hz I have a grid tie inverter for my solar panels - this unit accepts between 150v dc into 500vdc It has a single input...

Is there any way to make Mathematica display the variable name in the output? For example, if I have the following: In[1]:= A = 1 + 2 + 3 By default Mathematica outputs this: Out[1]:= 6 I would like it to instead output something like this: Out[1]:= A = 6 Or in some other way...

Is there a way you can redirect both input and output in a Windows operating system. The book I am using only explains how to do this in DOS. Thanks.

Homework Statement 67. How fast must a cyclist climb a 6 degrees hill to maintain a power output of 0.25 horse power? Neglect work done by friction and assume the mass of cyclist plus bicycle is 70 kg. A. 2.6 m/s Homework Equations W = mgh = Fdsin\theta= \frac{1}{2}mv^{2}The Attempt...

Hi, this isn't a homework question, but this is one of the best technical forums I've seen for stuff like this so I thought I would give it a shot. Im an aerospace engineering student (3rd year) and like all engineers I like to tinker with stuff, but electrical wiring like this is not my...

Hey all. I am building an IR modulator but seem to have a small kink in the design. Here is my schematic: Here is a picture of the oscilloscope, connected between ground and the output of the TL555 timer and the output of the second transistor (the output pulse going into the LED's)...

Homework Statement A 4.50 cat leaps from the floor to the top of a 97.0-cm-high table. If the cat pushes against the floor for 0.230 to accomplish this feat, what was her average power output during the pushoff period? Answer in terms of horsepower. Homework Equations W = Fdx F = ma...

I'm tinkering with a simple heat engine and I want to experimentally measure its work output. The engine pushes a piston once per test, and I know the work done is on the order of 1 kilojoule. The problem is that the engine does the work on the order of milliseconds, but depending on the...

Homework Statement A car with mass 1000 kg accelerates from 0 m/s to 40 m/s in 10.0 s. Ignoring air resistance. The engine has a 22% efficiency, which means that 22% of the thermal energy released by the burning gasoline is converted into mechanical energy. a) What is the average...

Hello, I am trying to print in formatted output using the format specifiers but I am not able to get the correct output. I am trying to print an array with 11 reals, followed by one more real number and finally an integer. When I skip the integer, the format statement works and but when I add...

I've been playing around with an accelerometer I've got hold of, yet I'm having a little difficulty understanding it's output. Electronics isn't my strong point. I understand the output is a voltage, but the I'm finding the values hard to interpret. When connected it outputs data in the...

Homework Statement A Carnot engine working with a monatomic gas operating between two temps, 288K and 497K. The engine performs 800 J of net work. Homework Equations Q = nRT ln (V final/V initial) The Attempt at a Solution I don't have enough info for the above equation. I...

Homework Statement A 580w heater is designed for use in Germany, where electric outlets supply 230V(rms) service. What is the power output of the heater when plugged into a 120V(rms) outlet in the U.S.? Ignore the effects of temperature on the heater's resistance. Homework Equations...

http://pastebin.com/d49e23fad -- I input 0.0 for the left endpoint and 100.0 for the right endpoint, yet it printed "1.910014e-3074.243992e-314"... What is going on??

Homework Statement Calculate the power output of a 1.8-g spider(the black dot) as it walks up a windowpane at 2.3 cm/s. The spider walks on a path that is at 25^{o} to the vertical as illustrated below. http://img19.imageshack.us/img19/4107/spiderl.jpg Homework Equations P = W/t F =...

I'm using a LabView controlled alarm system in my lab where an alarm condition triggers a USB DAQ analog output signal to switch from +5V to 0V. This signal is going to a sensaphone express II alarm box normally open relay input. The normally open relay input sees 5V as an open (no alarm...

i have used different PSU on a simple electromagnetic motor (tattoo machine) and have notice a machine will run a certain way at 2 volts on one power supply but require 9 volts from another power supply to run the same. Question being is it the amp rating of the power supply that does this...

I'm a bit confused about power output and gear ratios. I think it's best to explain by going by my example (imperical units, sorry Americas & Brits): Mass: 1300kg max. power: 128 kW @ 5500 rpm max. torque: 245 Nm Gear ratios (from a slightly different car type, but should be similar): 1st...

To send a signal, how much power does the microwave transmitter use?

Hi, Does anyone have advice for how I can amplify a current output for low cost. Here are the details: I'd like to use a pulse generator to actuate a solenoid valve. The pulse generator has a variable voltage output (0-20V), and a current output of 0.2 - 0.22 A. The solenoid valve requires...

Could placing a photovotaic inside of focus of a concave mirror amplify the effiecentcy X times?would commercial panels take the extra lumens?

i can't seem to understand why with current transformer if the primary winding is reconnectable the rated output stays the same. but rated output depends on turn ratio if the secondary winding is reconnectable?? why??

Hi, I have a small DC dynamo (with no spec sheet) which i digitally sample to find it's voltage at any given time. I want to display theoretical max power output, how can I calculate this? Can I use P=V^2/R where V is measured. How do I calculate R? I read a wikipedia article which says to...

Hello, this is my first post here! I am building a bicycle-driven generator using an alternator and battery (12v) pulled from a dead car. I can easily spin it up to the point where the alternator self energizes and produces output, but on a dead or low battery, the load on the alternator is so...

Homework Statement A solar-thermal power plant is to be built in a desert location where the only source of cooling water is a small creek with average flow rate of 100kg/s and an average temperature of 30 degrees C. The plant is to cool itself by boiling away the entire creek. If the...

Homework Statement A box of mass M= 1 kg rests at the bottom ofa frictionless plane inclined at an angel theta= 20 degrees. The box is attached to a string that pulls with a constant tension T=5 N. What is he power in Watts being delivered by the tension T as the block reaches x=50 cm...

So I have this VCO for which I'm trying to calculate the characteristic equation for, vo/vi. Image of this and the small circuit equivalent attached. I've also attached a simpler (in my opinion) common-source small signal equivalent to express that representation of the output, for instance...

Homework Statement Using the level shifter shown below, design a circuit that will shift a signal from from +/- 25 volts (50 volts P-P) to 0 to 5 volts. Assume R1=R3=100K and R2=R4. In answer 1 give the value for Vref with 1 decimal point of precision in answer 2 gie the value for R2=R4...

Does anyone know QBasic here? (cuz it is very uncommon) Here I have got simple output problem using loop. How do I accept a word(any) and print it like this(attached) We can use Nested loop,Left$ ,Right$ MID$,and blanks( please don't go into more complex functions because I haven't...

Homework Statement I badly needed an urgent help in Matlab. I have to create a Matlab function (M-File) that will output the low (flow) and high (fhigh) frequency components of a DTMF signal given the numeric symbol (x) (* and # not included). I don't even know where to start since...

Does anyone know how to figure out how to calculate a motor's output when used as a generator based on the manufacturer's specs for its operation? ie. Small, but powerful DC motor. 0.40" x 0.32" x 0.66" long. Operates on 1.5 - 3.6 Vdc. 110mA @ 3Vdc, no load. 500mA with load...

I need to test a variable-speed generator attached to a small wind turbine (lets say). I want to see how much power its producing, as well as the current. It outputs in three-phase Y configuration at frequencies varying from 3 to 9 Hz. The generator is rated at 1.2 kW at 550RPM, with an open...