Testing Definition and 589 Threads

I am developing a new product. I am currently constructing various prototypes of the product changing only one component using a different material with each model. I want to test the impact results of each different model dropping a consistent weight (i.e. 20lbs) from a consistent height...

Bojowald (and other bounce QC researchers) are approaching a kind of 'moment of truth' with the April 2009 scheduled launch of Planck and Herschel satellites. The nonsingular Quantum Cosmology models they are developing are expected to make predictions about structure formation in the early...

if i keep a funnel shaped long tube on the roof of a moving vehicle, will the air going in follow Bernoulli's equation?

Hi guys. Im new at this site so please be nice to me =P. I've been working on some practice papers for my upcoming end of semester exams. Cant get these two questions out ><. Any help is greatly appreciated Thanks in advance jenny xoxo 1. A sample of 28 students measured their...

Hi. I'm not too good at maths and I'm having some trouble figuring out the basics of what to do with complex conjugates of functions. Our lecturer has set a couple problems requiring us to test if a few operators are Hermitian. Before I can get to those I thought I'd test the basic momentum...

Homework Statement Having trouble understanding the question, which is... voltage specified to be 130 Sample of 20 readings gives sample mean of 128.25 Also given s.d.=3. "It is important that the voltage not be allowed to drop below 128 volts. What is the probability of rejecting mean...

I'm not sure if this is the right place to ask, but would any of you have recommendations as to where I can get this online first or preferably second hand at its best price? Alternatively, do any of you have this book and you wouldn't mind selling? My country is plenty small and my whole...

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Homework Statement Is the series from n=1 to infinity of 3/n converging or diverging? Homework EquationsThe Attempt at a Solution Since 3/n is not a geometric series, my guess is that we can just use the Test for Divergence and take it's limit to see if it's converging or diverging. As...

So I implemented a tridiagonalization algorithm, however I don't know if the result that I am receiving is accurate. Does anyone know of an easy way of testing this? I suppose it is possible to scour around for code, but it would be difficult to find matching code. So if anyone knows anything...

I am going to test a full body harness. I need to know how far a 420 pound weight needs to drop to exert the same force as a 350 pound weight dropped 5 feet. Thank You Norm Wood

Hello, I was wondering what kind of reliability tests I could do with landing gears. The one we are working with, is a conventional, trail dragger. Right now, we are building a model and later on the full size. But we are focusing on reliability and I'd like to know good methods so that I...

Hi guys For a science fair project, I am going to test the effects of X-radiation on flash memory. I'm intending to fill a number of 16MB (15,876,096 byte) Compactflash cards with data, hash check the data with hkSFV, expose them to the radiation and hash check again for any data corruption...

Can anyone give an approximation as to when CERN starts testing?

HI, I'm constructing a 2D nozzle for fluid testing. I have made my nozzle X5 larger and taken a 1/8" slice. Now I'm having trouble designing the 2d nozzle so that the exiting air will have a velocity of 3ft/s. I must maintain an Re number of 1000 as well. My problem lies in that fact that. I...

Homework Statement For a quantitative variable, you want to test H0; \mu=0, against Ha, mu not equal 0. The 10 observations are 3,7,3,3,0,8,1,12,5,8 a. I get this part b. The P-value is 0.002. Interpret, and make a decision using a significance level of 0.05. Interpret. c. If you had...

\frac{12.34 - 12.33}{12.33} x 100 = 0.054

suppose you have a solenoid with hollow core connected to a galvanometer. On one side you have a S-N magnet (ie. the N pole is nearer to the solenoid). On the other side you have a N-S magnet( ie. S pole is nearer to solenoid). ie. [S - N] [Solenoid] [N - S] Both magnets are...

Homework Statement I have 25 pairs of values. I have a gradient and want to test if this gradient is significantly different from 1. Which stats test do I use? I thought of using a one-sample t-test, but how are you meant to put 25 gradients in the test!? thanks...

Hello, I am making a circuit which runs a large current through a material at intervals, heating it, which then temporarily stops to make a resistance measurement. Each individual circuit is not an issue in itself, nor the timing of it since I have a computer interface which can grab analog...

In testing the loss through a fiberglass panel I experienced instances where the received power level increased. I have checked and double checked my setup and changed the distances between the horn and panel, I still am seeing odd results. Has anyone had any experiences such as this. I am...

I have a few series which I'm having trouble proving whether they converge or diverge. I know the following tests for convergence: comparison test, ratio test, n-th term test, and root test. Here are the series and what I have tried so far: \sum n -1 / n2 : I'm assuming this series diverges...

Homework Statement I am creating a device to provide 250 to 300 g's of impact force to an electrical device in a plastic housing. I would like to lift a steel plate approximately 16" x 16" X thickness "T",, to a height of "Y" and release it. It would fall at the rate of gravity, impacting a...

I want to test if one Poisson distributed result a is large than another one b. I don't know much about statistics, but I understood the Wiki article about testing normal distribution however they need the number of samples there. Basically I measure two Poisson distributed variables, I get two...

looking to design and hopefully build a micro-tensile tester to test the properties of human hair. as part of my uni class I need to design the grippers involved and have a look at non contact extensiometers. Could anyone point me in the right direction with some links or books? or even...

hello everyone, I'm doing a presententation on the physics of crash testing next week. It should be around 10-12 mins, and I need to cover Environmental, Social, Technological and obviously Physics of the topic. Any help, tips, or information would be greatly appreciated? even book names that...

can anyone proove "kelvin plank" statement of second law of thermodynamics or atleast show that it is always followed in any cyclic process...

Hello, I don't know a lot on this subject, but at a last nights weekly philosophical discussion a friend mentioned that they could use MRI machines to scan and see electrical impulses light up parts of the mind during electrical impulse testing to the brain. I guess like showing images to...

Hi all, I have the following code: where checkHR and checkMIN are 8 bit vectors (7 downto 0)... and SECL, SECH, MINL, MINH, HRL, and HRH are all 4 bit vectors (3 downto 0). What I'm trying to do is check to see if the first four bits of checkHR is equal to HRH. Can someone tell me...

I work for a plumbing company, and we recently put up some copper water pipes (~30mm) in a newly constructed building. The buidling isn't finished, and since it's below 0 degrees we can't test the pipes with water. So, we though about doing it with air instead. Some people tell me that this...

I am designing a Roll Cage (Using CAD+FE) and trying out new materials for testing/analysis. Commonly used materials i found are: * CDS Carbon Steel * ERW Mild Steel * DOM Mild Steel * Cr (Chrome Molybdenum) Steel * T-45 * 1020 Grade Mild Steel CDW Anybody...

How can I tell if the popsicle sticks in my physics bridge are under compression or tension. The weight is put on top of the bridge

How do we know that a given operator is Hermitian. I know that for an operator A to be Hermitian then A=A+. But I don't know how to apply this on something which is not in a matrix form. For example I want to know if L_x (x component of angular momentum) is Hermitian and I have no idea how to...

Testing of Impact Sensor--Verify G-Force Readings I'm thinking either free fall test or pendulum but I was just curious if anyone could suggest an easier method We are looking for a way to test a newly developed impact sensor and verify that we when it says it has been hit with 5 g's for...

Hi, I'm building a STM, and this is the circuit I use : http://www.geocities.com/spm_stm/Simple_STM_Rev_C.PDF I'm right now testing the circuit I build. I build a small part (U3A), and then test it, and build another small part (U3B) and test, then connect the two and test it again...

i have to think of different ways to test ohms law but could only come up with using an ammeter and voltmeter..the typical experiment that is seen all over the internet. what way could i test this law using basic everyday things? and what errors could happen for the typical experiment? could...

How does a rocket get tested in a wind tunnel? what is it's orientation? an airplane is facing the air, like in reality, as it flies. so does that mean you mount a rocket vertically, but have the wind come on the side? or do you mount it pointing in the direction of the wind? and does...

My girlfriend and I were talking, and she said that a way to tell if a vitamin is absorbed or not, is to mix a few different chemicals (can't remember what), and to see how the vitamin dissolves in this mixture. She said that it's because this mixture will have the same acidity as your stomach...

hey does anyone know how you can carry out an experiment to find out if a metal or non-metal has a metallic lustre?:confused: i have tried looking all over the internet but i can't find anything... if u could post answers or terms i can place into the google search panel it would be greatly...

Can anyone point in the direction of any information on dry lift testing for turboshaft fuel pumps? I need to write a good practices guideline for this and need to find as much info as I can. Thanks.

I know there are 3 kinds of symmetry: x-axis, y-axis, and origin. So, if you test the function for symmetry and it turns that it has one of these, does it mean that it cannot have the others? Therefore, one function has one type of symmetry only?

One fine day I was going about my business when I heard that the Maths Tower at Manchester University was to be demolished. I was shocked. To me it was an inspirational icon of learning, the thing that put the campus on the skyline, on the map, and on the picture postcards. I used to sit on the...

Hello, I am working on a project where I will have to do some shear cell testing, I have some basic under standing (very basic). and I have done some research on the internet. I have a shear cell tester. it is very basic, geared motor with a rod to push on sample , which is under a weight. I...

If I were to go to a random hardware store and look at some iron, how would I be able to tell how soft or hard the iron was? Also, is there any other cheap magnetic material that would work better then iron to make an electromagnet with? Thank you for your time.

I want to work on a bandpass filter program, but I'd like some realistic data to try it on. There's got to be something on the web to write/test programs with. Any suggestions?

Hello, Is there people amongst you who have ever dealt with Wind Tunnel testing? I cannot find a special section for experiments in this forum... I have a few topic to launch! Thanks...

How do you know that other people are self-aware and not just very sophisticated computers? In other words, let's say you had a box with something inside that gave answers to your questions, how could you ever tell if the thing in the box was self-aware? If it's impossible then what's the...

How would I compute the type 1 error rate of the following test: accept that coin is fair if in 30 tosses the coin gives between 11 and 19 heads (inclusive), reject otherwise. I guess my Ho is 11/30<p<19/30 and H1: p < 11/30 or p > 19/30 so type I prob = P(p < 11/30) + P(p > 19/30)...

I'm currently testing a program I made for my professor. It's just a simple test, but it will probably take like 15-20 minutes! So, I'm killing time. The nice thing about our small department is that I can take off and leave my laptop behind without worries. I'm going to do a more...

Homework Statement Does the sum of the series from n=1 to infinity of 1+sin(n)/10^n converge or diverge. Homework Equations The Attempt at a Solution I can use the comparison test or the limit comparison test. I'm not sure where to go from here.