Input Definition and 586 Threads

Homework Statement A ball ( 2.7 g ) is launched at a 45 degree angle with a solenoid input of 50V. What is the initial speed of the ball? Homework Equations KE = 0.5mv^2 PE = mgh dy = vy(0)t + 0.5at^2 dx = vx(0)t The Attempt at a Solution Voltage is potential energy and I...

Hi, Hi. I am trying to enter some differential equations into a Runge-Kutta 4th order spreadsheet which requires input in the form y' = ...? My differential equations are in the form : dvx/dt = -FDvx/mv (i.e relate velocity derivative with respect to time to acceleration). Can anyone...

if the electrical energy stored in the leaf's battery pack came from a standard power plant and was delivered by a utility company ( like United Illuminated or Connecticut light and power) it was generated, transmitted, and transformed to the DC electricity that a battery can store at no more...

Homework Statement I am trying to determine the input I will have on a shaft with a continuous force of 3,720 pounds one foot out from the shaft center. I am thinking the input continuous torque would be 1 foot being that I am using a 2 foot pulley on the shaft, and I have a continuous...

If a question asks for the "quantity of work input to the pump" is it acceptable to present the answer as positive. I think so because the direction of energy transfer has been defined in the question itself hence there is no need for a sign on the answer. All that's asked for is the...

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...

So I already have two molecules (chemically valid, the artistic interpretation never overrides that validity!) which have a very special meaning to me tatooed on my left and right shoulder. I'm still very much a beginner, only starting to study physics, however I do understand a fair bit of...

This question has been boggling my mind. The capacitor input(C2) filter in this schematic helps me filter the output from the rectifier. With combination of Rchoke (is just a resistor and not an inductor) of 2.4ohm, it limits my peak current and filters the output voltage from the rectifier...

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...

Homework Statement Hello, Just a quick question here for Python. I'm using raw_input to get the user to type in a string, but I want the letters to display as * (like when you enter a password) as they type it. (But not actually register as *). Is this doable in Python? Thanks...

I am trying to input these 2 equations of motion for a double acting pendulum into mathematica in hopes of solving for θ2, θ2', and θ2''. I am fairly new to the program and I am having trouble inputting the equations. I am swinging a prosthetic leg like a pendulum and I am trying to predict what...

Hi everyone, i have been recently trying to get familiar with the Mathematica software for a project am working on. In the course of that i encountered a problem on graphics. here's the question: Superimpose the plots y=√(x^2+a), √a≤x≤√a+3 for the values a=1,a=4,a=9 in the same figure...

I have the following code which does not wait for input and skips right to the end. Is there something I miss? no = 0; total = 0; while ans>=0 ans = input('Input a number (negative to quit): '); no = no+1; total = total + ans; end; printf('\n'); disp('The input average...

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...

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...

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...

Hello all, I'm a 3D graphist trying to deal with particles motions and attributes for visual FX I have a surface mapped with a black and white picture. Those different grey values gives me a x value inbetween 0(min) and 255(max). Particles are shot from this plane and from random positions and...

Hello, I need help constructing a drop-down menu in Mathematica with options depending on the selection from a previous drop-down menu. The example is first the user selects a continent, and then the second drop-down menu shows the respective countries. Any help would be much appreciated.

I am working on a physics lab and wonder if an input impendece of +/-10V input 1M (for a voltage probe) is high resistance or low resistance. Can anyone help? Thanks!

Homework Statement An Xor gate has 3 inputs w x y and its output is z. If you invert one of the inputs, what will the output be? Show this in terms of a boolean expression and no matter which input you invert, the output will be the same. What is this type of gate called? Also, what...

Hello Am reading about amplifiers, and the articles i read suggests that for a successfull amplification the op amp should have an input impedance and zero output impedance. I want some explanation about this information, why the input and output impedance are important factors?

Homework Statement I have polynomials of the form: x1 + x2 + x3 + x1x2 + x1x3 + x2x3 + x1x2x3 The x's can be a combination of 1s and 0s, so all the possible inputs could be written as strings: 000, 100, 010, 001, 110, 101, 011, 111 The polynomials can also have coefficients a...g, so...

Hello, I am looking for an example of two input injective function, f(x1,x2), R x R ->R. I am very grateful if you can find one. Thanks

Zero input means input equals zero the input is to some differential equation D2x = Dx + x + Input the input = sin(2pi * f * t) so say I want to make a program that solves for the zero input frequency response. (Matlab actually) what would I need to set the variable for frequency to...

MATLAB "quad" and difficulty with vector input Hello all. Consider the following: function y = testf(x,a) y = sin(pi.*a.*x); ...and then we have a = 0.05:0.05:1; result1 = quad(@(x)testf(x, a),0,1) which crashes with ? Error using ==> times Matrix dimensions must agree...

Hey guys, I am extremely inexperienced with MATLAB and I"m struggling putting this ode into matlab. y' = -a*y+u(t-1)-u(t-3) I know that for y=u(t-1), you type: if t<1 y=0; else y=1; end and for y=u(t-3): if t<3 y=0; else y=1; But I'm confused as to how you'd combine all of...

Hey guys, I am wondering if anyone could help me with a simple problem. I want to remove key parameters from the "type declaration/parameter" portion of my code and into an external input file for easy access. The problem is, many of my variables (such as arrays) can't be defined until...

Hi, I'm trying to model the input impedance of a MESFET by using a series RLC circuit. For example I have the following reflection coefficients: .575 angle(-138) at 6 GHz .617 angle(170) at 8 GHz .610 angle(128) at 10 GHz As you can see, as the frequency changes so too does the angle. Does...

I am terrible with electric. I just need some guidance on reconfiguring a hall sensor to read the opposite input. I have an analog tachometer from the '80s that was used to sense a groove on a grounded, spinning disk. I want to use the probe (which has 3 wires) to sense a raised piece of...

I have problems with finding out how i can insert these three equations: into the TI-89 calcualtor, so i get the 3 answers in the bottom of the picture. I know how to do it if the 3 equations have the same amount of parts/sections, but like you see here the fir equation has 2 parts, but the...

I am trying to input a txt file into my fortran program. My txt file is a 9x2 table of integers, all I want is to display the values in the same format in my program. I tried using, program name implicit none integer :: input(9,2), I, J open (unit=20, file="values.txt") DO I =...

I have attached image. Thanks in advance.

Why is the right side called the "input?" I'm looking at linear, 1st order ODEs, like y' + p(t)x = q(t) The notes I'm looking at are calling q(t) the "input" of the system, but I'm not sure why. I understand how to solve the equations, but I must be looking at it differently or something...

i'm having trouble with user input & error checks. after the first iteration, if there is an error, the correct error message shows up. but for the next iterations, the error messages for the opening of the input and output files show along with the correct one. idk if that made any sense...

Hi seniors, I am struggling something with my audio ADC. I bought AD7811 from farnell, which is an ADC to convert my analog data into digital. But at this stage, i found that a SERIAL CLOCK INPUT is needed to supply into the IC. However, I m wondering what exactly the clock i should...

Just recently started toying around with this idea. and was looking for some good input from anyone more experienced in this area. I am currently working on a much smaller railgun but I plan on working on this larger one. I am working with some others on this project I am more of the...

Think there is a simple solution to this but couldn't find any... Well as the title describes, i am wrote a program that generates, sorts, does some calculations and assings all results to a variable which is set before. Can i get the user assign the variable name which results will be assigned...

Homework Statement a 25% efficient machine performs external work of 200 J. what input work is required?..please answer,,is the answer is 800 J? Homework Equations The Attempt at a Solution 800 J

So I have to build a boombox using transistors as amplifiers for my Engineering Electronics class in college and it works and everything. The only thing I have a question about is I want to make my own cord to use my iphone as the audio input signal that is to be amplified. At the lab they have...

So, a heated debate started over whether input really exists since the equals sign is a case of identity. For instance, x^2 = 16. x could either be 4 or -4, but both sides of the equation (both expressions) are really only expressing the same thing... the value: 16. One wouldn't normally...

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

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.

I would like to ask you what it is meant by "symmetric input" in the instrumentational amplifier schematics and in the differential amplifier? I can`t understand what is the difference between symmetric and non symmetric input and output as parameters. Can anyone explain ? Thanks

Hi, I need to realize the function f = yz + (x'+z')w using 4, 2 input NAND gates. The function can be written in the appropriate form like so: f = yz+wx'+ wz' f ' = (y'+z')(w'+x)(w'+z) (f ')' = (y'+z')'(w'+x)'(w'+z)' Its just that i don't know how to to it when you are required to...

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...

how to get an input matrix from user? WITHOUT using the MATLAB ‘MULTIPLICATION COMMAND’ write down your own program to implement the matrix multiplication M = A*B, where A and B are two constant matrices of dimensions l x m and m x n, respectively. The program should:  Prompt the user to...

Hey everyone, I have a kind of large problem. I am trying to input something in C, a number between 0 and 50,000, using scanf(). I understand how scanf generally works, and it does for the most part, but for some reason if the number I enter is greater than 37504, the program just stops...

For an inverting op amp with the positive input grounded, the equation for V(out) is (Vin)*Rf/Rin. Thats fine But what if the positive input is not grounded? What if there is a voltage applied to that input as well? How would I find V(out) when the positive input voltage is larger than the...

A question regarding power supply efficiency: The theoretical maximum efficiency of a full-wave rectifier circuit with a resistive load and no smoothing is around 82%. In the calculations to derive that the resistance of the source or the rectifiers does not enter into the equation, so the...

I'm not sure if ii'm asking this question on the right forum but how do i put a neat equation into here to ask a question instead, for example, 4+x^3/2. How do i put that into a neat equaiton like you would find in a textbook? Thanks.