Output Definition and 1000 Threads

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...

I'm having trouble understanding the output stage of the venerable 324 op-amp. The top part of the schematic is simple enough, but I don't understand the bottom half of the output stage - is it some kind of complimentary symmetry Darlington? Thanks for any advice.

In the output charecteristics of a transistor in CE mode, according to the eqation V[SUB]CE = V[SUB]CC - I[SUB]C R[SUB]C it comes as when V[SUB]CE increases I[SUB]C decreases and vice versa. But it is only because of the reverse collector-emitter voltage, the charge carriers are attracted to...

I recently inherited some legacy code written in fortran77 which I'm going to be modifying quite a bit, and at this stage I find that I'm continually getting stuck on small fortran quirks... Just wondering if I could get some advice on this particular problem. I'm outputting the values of...

Dear friends, I would like to know how can I remove an AC signal from a signal which is combination of AC+DC. AC signal 60V/50Hz DC=50V. Please suggest me a C code or any algoritham or a filter which can remove AC signal completely and I should be able to see only DC...

Help needed... Hi firstly I am still very new to Electronics doing a home study course and need some assistance. The module I am working on at the moment has a question. Draw a circuit which could be used to produce a large output at one particular frequency? The Attempt at a...

I don't think I have done it right! Thanks In Advance! Homework Statement Water flows over a 60-m high waterfall at a rate of 2000kg every 5 seconds. What is the potential power output of the water fall? Homework Equations KE = 1/2 mV*2 V = Displacement/time P = E/t...

Homework Statement hey guys i have been undertaking a project on constructing a small scale hydro electricity generation system. I completed my project and was able to generate electricity using a turbine and a genrator, what i need to do now is find theoretical values for the electricity...

Homework Statement A blue semicon LED is connected in series with a 10ohm series resistor to a voltage source. The LED emits 4.03 x 10^16 photons/s at a wavelength of 400nm. The current flowing through the LED is 40mA and the voltage across the LED is 3.5V. Calculate the power conversion...

Homework Statement A car of mass 1100kg starts from rest at sea level and climbs a hill of altitude of 50 m. At the top of the hill the car has a speed of 25 m/s. The work produced by the engine of the car is? Homework Equations W= F(d) F= ma The Attempt at a Solution W =...

I had this problem before. But a friend of mind open up my laptop and fixed it. I was told that I could also reinstall sound drive for laptop , but don't know the procedures for reinstalling sound driver. I have already checked that whether the sound was muted , turns out it was not muted. What...

Hi, I need to get a precise linear oscillatory motion from a rotary input? Its for a compact carving tool. Any ideas on how to control the displacement? Thnks

Homework Statement Power is generated at 24 kV at a generating plant located 124 km from a town that requires 40 MW of power at 12 kV. The voltage will be stepped up from 24 kV to some voltage V by a perfect transformer, transmitted over wires, and then stepped down to 12 kV by another...

Homework Statement Suppose your mass is 76.0 kg and you climb 40 stairs of height 18 cm in 19.0 s. What is your power output as you climb the stairs? Homework Equations Power = Work / change of time The Attempt at a Solution I need a hint on solving for the work. I tried solving for the...

What physical processes input information into and extract information out of a quantum computer? What I really want to know is: How do you get a qubit or quantum dot to take on a particular state and cause its' entangled partner to choose a state? Thank you!

So I have this code: function ApproxSinDeriv(x,n) h=.5; for i = 0:n h; approx = (1/(2*h))*(sin(x+h)-sin(x-h)); error = abs(approx-cos(x)); h = h/2; A=[i,h,approx,error] end Basically, it's a three-point formula for approximating a derivative, where the variables n = the...

I'm having problems filtering out certain frequencies from others with a series LC filter. I have a 1.923 Henry DC filter choke inductor set in series with a 0.1 micro Farad capacitor. I send the signal through the inductor to the capacitor and output from the other side of the capacitor. I'm...

Homework Statement A top fuel drag racer with a mass of 500.0 kg completes a quarter-mile (402 m) drag race in a time of 4.3 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. Homework Equations P = W/T...

Homework Statement The sun outputs about 3.9x1026 W of power, a small fraction of which reaches the Earth’s surface. The sun provides about 100 W/m2 of power to the Earth’s surface averaged over time and weather. How much energy is deposited on average by the sun on Washington state in an...

Homework Statement Calculate the output of the op-amp as shown in the given circuit. http://img9.imageshack.us/img9/7554/184v.png (Answer=0) Homework Equations Kirchhoff's Current Rule The Attempt at a Solution By applying KCL, I1+I2=I3 V1/R1 + V2/R2 = Vo/R3 Substituing...

Inputs of a gate are 1 & 0. Identify the gate if its output is (a)0 (b)1 Attempt: (a) And Gate but NOR and XNOR gates also match the description (b)OR GATE alongwith NAND and XOR So is writing down all the gates matching the requirements of the question (technically) correct?

Hi, I'm using a version of daqacquire to acquire a sample of sound data. This program also uses daqdocfft to perform a Fourier transform, allowing me to view the frequencies that are present in my data sample. My problem is that I don't understand how the function is calculating the...