Measuring Definition and 962 Threads

I am building a machine for my martial arts club so that I can have a bit of fun and measure the speed and reaction times of my club mates. The design that I feel would yield the most reliable and accurate results would be to mount an upside down 'pendulum' on a frame. At the head of the...

How is the effective (or renormalized) coupling constant at a given momentum scale scale measured? If one wants a definition which makes it easy to measure I would think it would be natural to use the LSZ formula which connects the measurable Feynman amplitude with the amputated greens...

Homework Statement Homework Equations N/A The Attempt at a Solution I am having trouble getting my head around these questions, the first part a) wasn't too tricky, I used the fact that eigenfunctions of a Hermitian operator \hat{O} are orthogonal and got my normalisation...

If a person has actually 1 kg(for example)(on earth)how will a beam balance recognize it?What if the person was on the moon, will the beam balance show 1kg there too?if so How? And how can one find gravitational acceleration if he does not know mass of an object(he knows Force)

The circuit above uses a voltmeter to measure the voltage allotted to it through a potentiometer and the varying voltage acts as a signal. Could this signal system also work by measuring the current allotted to a load based off the position of the potentiometer (i.e. higher voltage = higher...

Hi, I brew beer and part of the process is measuring the specific gravity of the fermenting liquid. This is done visually using a hydrometer. Digital hydrometers are available and very expensive. I'm trying to come up with a way to measure the liquid specific gravity electronically. Typical...

This question is for a project I'm doing for my circuits class. I'm trying to diagnose a problem. Basically I got this coil. I measured the resistance of the coil by connecting the ends of my multimeter to the uncoated ends of the coil. I got a resistance value. However, when I tried checking...

Homework Statement Hi, I've been having trouble setting up an oscilloscope, with a AC voltage supply, to a breadbox, with a "black box" in the circuit. the black box is just a set of 3 pairs of terminals, each a "unknown component" such as a diode, capacitor, resistor, etc. Basically I need...

Is there a simple way I can measure the propagation delay of my logic gates? For instance, is there a circuit I can build (using logic gates) to measure the propagation delay? What if I tried building a circuit whose output constantly oscillates? This would certainly prove that the...

what type of circuit would you draw for this? and how would you actually measure the light intensity of an LED. say you had multiple LEDs and you wanted to compare the light intensity of all of them. how would you do this with with circuit?

I'm somewhere at a suburb near Sydney and I have problems designing an experiment to measure the strength of the Earth magnetic field so that means now I'm close to geographic south and I'm close to magnetic north right? how do I measure the angles between the GS and Mn and what do I have to...

I have a motorcycle engine on a test stand and I need a way to measure the mass flow rate into the engine. It is currently carburated. I had two ideas off the top of my head. 1) build a venturi, and measure the pressure drop to figure out the velocity and therefore the mass flow rate...

What is the state vector of the system after measuring a degenerate eigenvalue? Surely there are infinitely many vectors of norm 1 that it could be since the degenerate eigenvector span a 2d subspace. Say that we e.g. have a system where the operators eigenvalues are degenerate such that...

Homework Statement The individual threads in a cloth are very close together. Design an experiment to investigate how the rate at which water passes through the material depends on the separation of the individual threads in the material. Available equipment...

The weather got warm enough for me to go for a bike ride on Saturday on a favorite route. As summer and early fall are long behind me I am not in as good of shape as back then. Riding my bike up a particularly steep hill and trying not to push stupid hard I was a bit depressed at the state of my...

Homework Statement You use a standard gram weight of known weight (x) to check the accuracy of a balance. For one balance, this standard is weighed 3 times yielding the following values; a, b, and c. Calculate the 95% confidence limit for the mean Homework Equations general statistics...

Thought this article may spark some interest if it works out we may gain a better understand of BH's. http://www.sciencedaily.com/releases/2013/01/130130132324.htm

Hi, I'm reproducing a measurement of vibrations and I would like your help with a certain question I have. I have a rectangular plate supported by two rods and I want to measure it's fundamental flexural vibration frecuency, among other things. As a base I have a report of such a measurement...

how can you use the angle to determine the distance if you don't know the motion of the star itself. is it by observing the star from the same point in two different years and then subtracting off this effect?

Hello everyone. I'm working on a project where I have to do a finite element simulation of low frequency magnetic coupling. But my problem is that I don't know the permeability of all the objects involved. Can anyone suggest a good way to measure the permeability of these objects ? The objects...

Hi, I'm quite new to quantum mechanics, learning about it in my free time in a life-long learning fashion :) I've been trying to find a solution to a problem for some time, and the results I included below appear to be OK, but I have doubts about the method I used, so any help or guidance...

Homework Statement A spin-1 particle is placed in a constatn external B field with B_0 in the x direction. the intial spin of the particle is spin up in the z direction. Take the spin Hamiltonian to be H=\omega_0 S_x determine the probability that the particle is in the state |1,-1>...

"A 2kg rock is suspended by a massless string from one end of a 1m measuring stick." 1. "A 2kg rock is suspended by a massless string from one end of a 1m measuring stick. What is the mass of the measuring stick if it is balanced as shown below." ______________ |___|___|___|___| M...^ ...^^...

I have pulse generator that produces negative Gaussian pulses with fwhm~0.3ns. It is driven by the falling edge of a regular square wave from a function generator. I want to make some kind of measurement on an oscilloscope of the jitter of the pulse by comparing the output from the function...

What are the most recent or most accurate attempts at measuring photon mass? Additionally, what are the upper limits, uncertainty or error associated with those measurements?

Hello, The general description that we give for forming a star i.e. through supernova explosion or through some stellar disturbances...etc.etc. How do we know? I mean to say is there any way for knowing, visualizing, or calculating the way how a star is formed, how it dies? Is there any...

Abstract In this experiment, a beam of light from a laser was reflected off of a rotating mirror to a fixed mirror, and then reflected back to the rotating mirror. The returning light was focused to a point image in a microscope. Due to the continued rotation of the mirror while the light...

Homework Statement I have an extended system consisting of a track, a spring, a spring attached to a moving cart on one end, a string attached to the other end of the cart, and a hanging object attached to the end of the string. I need to find one equation that allows me to measure the total...

Hi, I have to write a report on measuring g using a simple pendulum and I wanted to get a bit of the background. I understand that a pendulum was the best way to measure g up until about a century ago but did we use anything before that? Also what kind of methods have taken over? I've tried...

I have to measure the magnetic field created by a solenoid. My attempt would be using a commercial Axial Hall Probe, or a Hall Sensor with some electronics. It has got an active (sensing) area with a diameter <1 mm. My coil is 12 mm long and has an inner diameter of 9 mm-s. My problem is that...

Hi, I'm an amateur rower exploring the ways of measuring the speed of the boat through the water. I am attempting to design and make my own speedometer system using probably Arduino, I know that GPS and impeller are the two main ways of measuring velocity, however I am curious to explore other...

I was using a signal generator to perform some tests. The circuit was simply the generator in series with a 1 ohm shunt resistor. Even though I was working with high frequencies (1 to 20 MHz), shouldn't the voltage drop across the resistor be the generator amplitude itself? I was using the...

Hi I could not figure out what is the reason of measuring current in accelerator and it shows which features of the beam? any help would be appreciated.

Hi everyone, have done an experiment on electricity. We had an AC function generator, set on a PP voltage of 3V. We measured the output voltage both with an Analogue Multimeter and with a Voltmeter at two different frequencies. Everything went right with the voltmeter, and for a frequency of...

Can we measure the distance between the first particle to enter the Bang event field and the last particle to enter? What would this distance indicate?

I found on the internet that there are 2 main multifactor productivity measures: 1) total output / (labour + capital + intermediate inputs) 2) value added / (labour + capital) , where value added = total output - intermediate inputsThis two measures make sense but my teacher said that...

A 75g Frisbee I thrown from a point 1.1 m above the ground with a speed 12 m/s when it has reached a height $.1 m its speed is 10.5 m/s What is the reduction in Emec of the frisbee-earth system because of air drag? At first I thought Since ΔEmec= Δk+Δu the change is -0.61 J Then I...

Homework Statement

Hi guys:I have a project to design ECG i want to calculate the six leads(I,II,III,aVR,aVL and aVF) by this method: i will measure the voltage of three probe or electrode(RA,LA and LL) RL as a reference by using DAC(digital to analog converter) the DAC connected to PC computer, and...

So I came across a question on the internet and its confused me a lot. We have 200g of water inside a cup. We neglect the mass of the cup completely and assume no water is lost. We also assume that the gravitational field is uniform within our experiment room. So we place the cup on some...

Hey, I am working on a science fair project and I have an electrolytic cell that will produce hydrogen. My goal is to measure the energy input and output to calculate the efficiency of the cell. Right now I am trying to find the best way to calculate the input energy. I am in the process of...

Homework Statement I've recently completed a experiment involving a Driven series RLC circuit. The potential difference across R " a variable resistor >> internal resistance of inductor" was measured. When calculating the current from the PD across R, should I include the internal resistance...

I need a simple method to measure eddy currents in a pipe. Thanks.

In Griffiths' page 36/37 he says "As we'll see in Chapter 3, what |Cn|^2 tells you is the probability that a measurement of the energy would yield the value En (a competent measurement will always return one of the "allowed" values - hence the name - and |Cn|^2 is the probability of getting the...

Homework Statement In lab, we were instructed to create a circuit that uses nichrome wires and identical bulbs to measure the obstacle caused by an object. To do this, we slid the alligator clip along the nichrome wire until the 2 bulbs in parallel are the same brightness. The object that we...

Hi There, I'm looking for ideas on finding the position of objects (such as a hand or foot) placed in a tank. Without using a camera soultion, I think the use of something like a minature laser range finder or IR proximity sensor. My problem is that I need to find distances between 5cm (min...

Hi there, Im confused by something that came up in my quantum mechanics lecture. The lecturer posed us a question. What result do I get for a measurement of momentum if I have already measured the energy. I assumed after measuring energy that the system would be left in an energy...

Homework Statement A hiker's trip consists of three segments. Path A is 6.0 km long heading 60.0° north of east. Path B is 6.0 km long in a direction due east. Path C is 4.0 km long heading 315° counterclockwise from east. (a) Graphically add the hiker's displacements in the order A, B, C...

Homework Statement n A student performs a combustion experiment by burn- ing a mixture of fuel and oxygen in a constant-volume metal can surrounded by a water bath. During the experiment, the temperature of the water is observed to rise. Regard the mixture of fuel and oxygen as the system...

I want to test several different fluids on an inclined planes and figure out which one is the most slippery. What would be the most scientifically sound way to measure this?