Measuring Definition and 962 Threads

Hi all! I would like to know how, in workshop practice, one would measure the tooth thickness and pitch of a spur gear?

Can someone explain the equation g/cm^3 in layman's term? I was reading up on this article on Saturn's moon Enceladus, having heat, and the first thing i though was the gravitational tuggin from Saturn and it's other moons. And i came across this equation and seem like it's used to base density...

to measure the amount of power drawn by an appliance, can we simply multiply the voltage (V) of the mains by the current (I)drawn (measured using a digital clamp meter) by the appliance to obtain power (P=I x V). does the power company charge us (rate x Power) based of this value P, regardless...

Hi, I'm doing a project on mesuring the conductance of flames, but I need a lot more physics to back up my theory. I'm pretty sure that the Boltzmann factor is involved, however I can't link the two items together. The experiment so far has worked, by using a bunsen burner to burn the salts...

I need to measure force and input the data into a computer. I found some force sensitive resistors, but they weren't capable of handling forces of several pounds. What I wish to build (if cheap enough) is something like this...

Hi all, 3 phase power is measured using 2 and 3 wattmeter methods.Correct? can someone explain how these 2 work?I cudn get enuf info on it.

A light spring of constant k = 153 N/m rests vertically on the bottom of a large beaker of water (as seen in the picture below). An m=4.63 kg block of wood (density = 675 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium (b). What is the...

I was going though one of those aquariums where you can walk through a plastic tube and can see the sea creatures up close without getting wet. How could I find an approximate thickness of the tube just with my eye and something I can bring, like a flashlight, ruler, protractor, or whatever...

Hi Peoples, Newbie here who would really appreciate some advice! I'm developing a machine to emulate G-Force but within a defined area therefore i need to now what forces are at play and what is required to sustain for example 1G or 2G upto a 5G range. If this was a confusing question...

Here's the thing. This year we had to work on a project, mine's about building a thermoacoustic refrigerator. I'll first give some background, for those who are not familiar with it, and believe they need to know these details to answer my question: Essentially, it's made of the following...

http://news.bbc.co.uk/2/hi/programmes/from_our_own_correspondent/4566123.stm

Hello! Question one: How do u measure the surface tension? (I'm looking for the experimental method now, not the theoretical one by itself) Question two: When ejecting water droplets at a high velocity at a small angle to a water surface/body, the droplets might not merge with the body of...

I have homework, the teacher gave us measuring spheres. He gave us the formula (4/3 π r3) But he didn't show us how to figure out the problem. I don't know how your suppose to figure it out.

i have a rotating disc. I have a tachometer and a sensor tape. Where should i stick the tape to measure the rpm correctly? How tachometer works? One more question. a rotating disc has kinetic energy. Why we study energy of a rotating. Now if i stop the rotating disc according to law of...

It is necessary to determine the strength of a radioactive source. Counting equipment has been made available for only two hours. How should the time be schedule if: The net source counting rate is 7 times the background rate. I mean I would say that you would use relatively short counting...

How would I measure the temperature of the brick when it is between 20oC amd 800oC. Would I use a thermocouple/pyrometer? If so, how would I put this in the circuit? Obviously, the resistance of the brick is high, so i will need a microammeter in series.

Hello, I have to start working on my physics extended essay and I got the idea of measuring the speed of an electron in a conductor. For instance, I could take a piece of wire (r) made from some conductor and I would like to find out the net speed of the electrons in the wire once I create an...

Do you have any good protocols for measuring the concentration of RNA? The ones i have they seem to be very confused. Thanks.

i want to know Why sometimes is it more accurate to weigh liquids than to use a graduated cylinder to measure them??

In a chemical investigation I'm currently undertaking as part of a chemistry course I'm am studying I'm recording how the temperature changes in several reactions and using the rate of temperature change as a measure of the rate of reaction. I believe this is a valid way to do it as you...

How can I determine the speed of light from a glass plate? I have the the numbers that I compared the average experimental value of the index of refraction with the general range of the index of refraction of glass.

please help! measuring the velocity of sound by an air column hello, I'm new here and in desperate need of help. I conducted an experiment to measure the velocity of sound by an air column. The experiment didn't go very well. It was difficult for me to depict the change of sound. Anyway I...

I want to measure the rotational speed of Io using a spectrograph, using the doppler formula. Since it is rotating around Jupiter, i have to take the velocity relative to jupiter, but I wonder tough how this is possible when Io is not rotating at an right angle to my observation point. Is there...

The distance between stars is measured by the time it takes light to travel between them correct? How do you measure the time it takes? for example from CNN "It is 12.7 billion light-years away, meaning the light just recorded -- by NASA's Chandra X-ray Observatory -- took 12.7 billion...

Hi all. I am working on a small project where i have a motion device, its a ball bearing in a metal pot with a metal rod running though the centre of it, as the ball moves around it makes and breaks contact between the rod and the pot. The output of this sensor is read by a...

dear everybody! i am very confused about this area and hope that you can help me out of this. for example this protocol: 1. Add sufficient bovine gamma globulin to each of eight test tubes to give you a calibration curve. Suggested values are 0, 10, 20, 30, 60, 90, 120 and 150 µg/ul...

I wasn't sure where to post this, so feel free to move this thread if necessary. I want to measure the current of a circuit using a multimeter, a power supply, and 3 resistors. How do I insert the "rods" on the multimeter to measure the current in the circuit? I know I have to measure it in...

Does anyone know if it is possible use a soil pH meter to measure the pH of liquids (ie. not soil)? Or a better way to phrase it, is there any diference between a soil pH meter and a normal pH meter meant to be used on liquids that would cause inacuracies or other problems if one was...

How did British engineer John Smeaton measure the efficiency of an overshot waterwheel? I am doing an experiment with overshot waterwheels to find their efficiency, and found that John Smeaton measured their efficiency at about 65%. However I have no idea how he got this number, and I cannot...

In Sipser, "Introduction to the Theory of Computation", a proof that "every t(n) time nondeterministic single-tape Turing machine (where t(n) ≥ n) has an equivalent 2O(t(n)) time deterministic single-tape Turing machine" shows that the running time of the equivalent NTM is O(t(n)b^{t(n)}) and...

I’m trying to measure g using freefall. I’ve conducted the experiment and now I’m struggling with the formula. The formula we’ve been told to use is: S = ut ½ at2 Substituting a for g (because that’s what I’m trying to find). S = ut ½ gt2 The initial Speed is 0 therefore I can remove...

I'm an undergraduate physics major and I want to create an experiment where I measure the difference in gravity between sunrise, noon, sunset, and midnight (and everything in between for that matter) due to the tidal effect from the moon and sun. I did some calculations and I expect the...

I'm wondering two things: 1. Is it possible to determine the distance from earth-jupiter, jupiter-sun and the diameter of Jupiter using only a telescope? 2. Is it possible to calculate the rotation speed of Io by comparing two CCD images taken a certain time apart? Thanks.

Hi all ! There is a question I can't find an appropriate answer. Conceptually, I can see what is ASE (amplified spontaneous emission) in lasers such as fiber lasers, but... what information does a measurement of the ASE spectrum give to us ? I know that reducing the ASE is of great...

By using the following formulation of the thermoelectric effect: \mathbf{j} = \mathbf{\L}_{11}\mathbf{\xi} + \mathbf{\L}_{12}(-\mathbf{\nabla}T) \mathbf{j} = \mathbf{\L}_{21}\mathbf{\xi} + \mathbf{\L}_{22}(-\mathbf{\nabla}T) where \mathbf{\L}_{ij} are tensors that charaterizes a given...

Hey everyone...I need work out how big my bike alarm has to be to fit under a bike saddle...so could you please tell me by how far you move your saddle up, so you can ride your bike properly and sit comfortably?...This can be done by measuring the length of the metal rod that holds the saddle...

I have a problem where one reading is 743mm at the top of the building and 760mm at the bottom of building. In order to find the height of the building I tried getting the difference of the two readings and multiply by the density of the mercury that it contains. I should come up with 179 m...

how to measure speed of light??

For a physichs project I had to build a trebuchet. I measured how for it shot, and how long it took. After some calculations I got: Vi in the X= 6.258 VI in the y= 6.64 Accel in X= 0 Accel in Y= -9.8 Distance in the X= 4.8 Distance in the Y= 2.25 Time in the X= 1.36 Time In the Y= .68...

Hello, I'm stumped about a relatively simple problem. Here it is in its exact form: "You need a rectangular prism with its height at least several times greater than its length. Put this prism vertically on a table or any other horizontal plane. How does one determine the coefficient of...

I was assigned to do a Lab report on an experiment we did in class.. this is for advanced physics honors.. I want to know if there's anything I should have that I don't .. or if something doesn't sound right?? Also .. could someone help with writing the Abstract?? THANKYOU! Abstract...

I am doing a project called "gravitational waves in the rubber universe" and am looking for a little help. The idea is to make a cone shape from latex and roll a ball-bearing around it (a bit like those donation boxes where you put in a coin and it rolls around in circles until it falls in the...

Hiya! I'm confused, for my Physics A2 Coursework we're measuring g (gravitational field strength) and I don't know the centre of mass of the pendulum. Will this affect my experiment and/or results? Should I do something to overcome it? Please Help! Sam(antha) xx

Is the parallax method still the one most widely used (for the relatively nearer stars at least)? More particularly, is it still the case that we take one measurement then wait six months until the Earth is on the other side of the sun and take a second measurement? Or has this been superseded...

Does anyone know how the speed of light from sources outside the galaxy is measured, such that we are able to recognize that even from these sources the speed of light is constant?

http://floti.bell.ac.uk/principles/star%20delta/img008.gif sorry...i don't know how to post the pic here...juz want to know if 6R resistor is replaced by a galvanometer which has the internal resistance 6R,what will be the reading?

Three identical flat disks whose thickness T<<<D , the diameter, are arranged with their axes of rotation mutually perpendicular, are calibrated in a stationary frame such that the three total number of revolution counts are exactly the same. Each revolution of each disk is counted by a separate...

Anyone attempting to argue the Special Theory of Relativity needs to understand the basics of how light travels, and how we perceive it. Einstein wrote that the speed of light does not depend on the speed of the object emitting the light. To prove this, Einstein referred to De Sitter’s...

You have two cloth ropes. The ropes have non-uniform thicknesses and are of different lengths. You also have a bucket of colored liquid. When you dip an end of a rope into the liquid, the colored liquid wicks through the rope, progressing through it at some non-constant rate. The total wick-time...

I did a lab in school where I took a triangular prism and shined light though it. I measured the angle of incidence and angle of refraction for three different angles. The lab question first told me to find the index of refraction of the prism using the two angles. That was easy. The next...