Testing Definition and 634 Threads

Equipment: Nicomp 380ZLS&S Sub-micron Particle Sizer & Malvern Mastersizer X Material: Ophthalmic Suspension, viscous and opaque When installing these instruments the technician started explaining why the Volume weighting was the most representative measurement...

Homework Statement A simple device that is used to test the strength of antifreeze in cars consists of a small tube that has several small, coloured spheres inside it. When antifreeze is admitted into the tube, some of the spheres will float, giving an indication of the strength of the...

Hello, I want to do a test heating a hot dog in a tube using a Magnetron from a 900W Microwave oven. Before doing the test I would like to know if there is any reasons not to mount the magnetron antenna on top of the metal tube, or on the side. (Please see attached picture) Also, will I...

I'm writing code to check if polygons intersect, but I've ran into a problem. I have two "vectors." Each has an origin and x and y components. They are facing towards each other. I need to write code that determines if there's a perpendicular axis that separates them. Here's a picture of what...

Boolean Algebra: Everyone will now about the situation once Jay starts gossiping. Leon is upset because everyone knows about the situation. Since Leon is upset, May is unhappy. Therefore, May is unhappy when Jay starts gossiping. I attached my working and I said it was invalid as line...

Hi, if I have some spread over a very small range of binned values, how can I test if the distribution is normal. Basically if it weren't, then the data would be fraud data. Is there a way to calculate something like a probability that the data was not manipulated and is correctly given by the...

Has anyone looked at this, it seems interesting to me. arXiv:1006.0007 [pdf, ps, other] Title: Testing quantum-spacetime relativity with gamma-ray telescopes Authors: Giovanni Amelino-Camelia, Antonino Marciano, Marco Matassa, Giacomo Rosati Comments: 5 pages Subjects...

Homework Statement We want to test wheter 40% of Kentuckians prefer popcorn as their movie snack of choice. a randon smaple of 100 movie goers shows that 55 of tehm pick popcorn as their favorite movie snack. Check the normality conditions, state the hypothesis, and state your conclusions...

It suddenly occurred to me that I've never heard of a test of the Equivalence Principle itself - such as something like ... An accelerating laboratory [in space] can see very obvious effects in external astronomical observations. Depending on the rate of acceleration, there would be...

Homework Statement If \sum_{k=1}^{\infty} a_k converges and a_k/b_k \to 0 as k\to \infty, then \sum_{k=1}^{\infty} b_k converges.Homework Equations It is true or false.The Attempt at a Solution I think it is false and here is my counterexample. Let a_k = 0,b_k=\frac{1}{k}. This satisfies our...

Homework Statement This is probably a really simple question , but how do i test my eigen values to see if there right ,---------- (A-tI)x=0 where t is an eigen value , I know how to test if my eigen vectors are correct but how do i test to see if my eigen values are right ...

In one of my events for Science Olympiad, I am given a water sample and must test for certain anions and cations. This wouldn't be a problem, except for the only chemicals we are given are HCl and NaOH. We are provided kits for certain ions, like phosphate and nitrate, but on the last test we...

In an experiment, students were testing their hearing range and found that it averaged about 25 Hz to 18 000 Hz. What are the wavelengths of sound waves producing these frequencies in air where the speed of sound is 343 m/s? Would I use the formula wavelength= velocity/ frequency...

Hello! Right now I am trying to figure out how much of an affect dust has on the power production of some solar cells that I have. I was just searching for a possible material to use for dust testing. Anyone have any bright ideas?

I've got a couple of problems I'm stuck on. Any help gratefully received! Test for convergence/divergence: \sum_{n=1}^{\infty} \frac {(n+1)}{n^3 ln(n+2)} What test should I do here? Can I rearrange the equation to be: \frac{(\frac{1}{n^2} + \frac{1}{n^3})}{ln(n+2)} and then use...

Hi all, We have a bearing pad at work that failed a porosity test and could not hold pressure (this was the pad itself and not the babbit surface). I need to look into some NDT testing that will give us an idea about the porosity. I have googled and some sites say different things, from...

when i have a system of only dependant sources and i want to find its norton /thevenin representation i need to add a testing source on the ports from whome we want to see the reaction how to know that i should put a voltage source or current source ?

Here's what I understand by flux: \int \textbf{F} \cdot \textup{d}\textbf{A}, the surface integral of a vector field. I gather the vector field that's integrated to give a flux is called the flux density (examples: the magnetic B field for magnetic flux, the Poynting vector for...

Homework Statement A yacht is of length 5m and travels at 10m/s. A scale model of length 0.5m is tested in a tank in order to predict drag on the yacht. Assuming that the fluid density and viscosity are the same for the yacht and model, can we obtain similarity? What is our best value for...

Homework Statement If \lim_{x\rightarrow c} f(x) = f(c) for all values of c, 0<or= c <or=5, and f(0)\neqf(5), which of the following could be false? A. f(4) exists B. f'(1) exists C. \lim_{x\rightarrow2^+} f(x) exists D. \lim_{x\rightarrow3} f(x) = \lim_{x\rightarrow3^+} f(x) E...

Homework Statement A cola company's long-term market share is estimated to be 45%. After an extensive advertising campaign, 68 out of 150 customers surveyed claimed to have purchased this company's cola recently. Was the advertising campaign a success? justify your assessment Homework...

There is a standard impact test that is used in the fenestration industry. An air cannon is used to fire a piece of lumber at the unit being tested. The mass of the 'missile' is 4.09 kg. The velocity of the missile is 15.26 m/s. I am wondering if there is a way to approximate this test...

Hi I am a high school senior barely scratching the surface of Nitinol traingin and testing. I ham currently trying to train .037 Nitinol wire but I can't seem to train it. On one occasion I placed the mold in an already heated oven around 900F and left it in for 5 minutes. Upon removal I...

I know this seems like a homework question but the last time I was in a physics class was <ahem> 1982. For product testing reasons, I have fabricated a (rough, very rough--no laughing at the fabrication/welding) 'repeating pendulum hammer'. Please see "test rig diagram.jpg" Distance from A to...

Can the Test for Divergence (limit of an->infinity not equal to zero) be used on an alternating series? For example, if a series has a (-1)^n term. Can we assume that since the limit of that term does not exist, then the series is automatically diverging?

please anyone can help me how make check the linearity and shift invarient for the system I want to determine whether the system is linear and shift invarientby steps g(m,n) = f(m,-1) + f(m,0) + f(m,1) g(x) = (integration from +infinety to - infinety) f(x,z) dz please help me...

Homework Statement Let X have a binomial distribution with the number of trails n = 10 and with p either 0.25 or 0.5. The simple null hypothesis p = 0.5 is rejected and the alternate hypothesis p = 0.25 is accepted if the observed value of X1, a random sample of size 1, is less than or equal...

http://i48.tinypic.com/2je2omq.jpg i need to find thevenin representation for this circuit i found that V_{th}=I_3*7 all the sources are dependant so we need to connect a testing source of 1 volt and see what current comes out but here i have step function so it could be 0 or 1...

Homework Statement Let X have a binomial distribution with the number of trails n = 10 and with p either 0.25 or 0.5. The simple null hypothesis p = 0.5 is rejected and the alternate hypothesis p = 0.25 is accepted if the observed value of X1, a random sample of size 1, is less than or equal...

Hi all ! What chronology of Bell inequalities testing ( their violation ) ? What positive and negative aspects of each experiment ? What experiments have been spent latest years ? Some material: http://arxiv.org/PS_cache/quant-ph/pdf/0310/0310192v1.pdf Thanks.

Homework Statement A drug company markets a medication that cures about 60% of cases with depression. A CB program is thought to be more effective. It was delivered to 15 depressed people. Determine the minimum number of cured people required to support the claim that the CB program is more...

Hi all, I was thinking recently about insulin testing, and whether the convenience could be extended to other hormones and biochemicals in the body. For instance the thyroid molecules T3 and T4. It seems like a device capable of testing for the level of these molecules on the fly would be...

What are good ways to prepare for standardized tests (IQ, SAT, etc) that ensure maximum clarity/fluidity of thought?

So, I have a HiPot tester with a minimum capable voltage of 100VDC. I'm testing for any leakage between a string-pot and the housing case for the unit it goes into, with the requirement being 45VDC applied to it. With the HiPot tester incapable of supplying a voltage that low, I am thinking...

Homework Statement Karen asks John to guess the date of her birth, not including the year (i.e. the day and month she was born; discount leap years). If John guessed correctly on his first try, would you believe his claim that he made a lucky guess or would you be suspicious that he already...

Hi, I'm interested in this question primarily in how it relates to what is usually called classic or frequentist statistics (p-values, etc). I'm fully aware of how stepwise and other automated techniques can negatively impact analyses and render inference based upon parameter estimates...

Homework Statement Hello, I'm working on a semester project a measurements class at my college. We are measuring the affects of different materials on the resonance of chambers. We are testing two chambers, one in the shape of a rectangular prism, one in the shape of a cylinder. We will be...

Homework Statement A hire-car firm is considering a special bumper bar designed to lower the cost of car repairs following minor accidents. This bumper bar is more expensive than the conventional one. It will only be introduced permanently if any reduction in the cost of repairs is judged to...

I usually get pretty nervous before tests / quizzes and I am a rather slow test taker. I suppose I could be optimistic and just say I am very thorough. I usually use as much time is allowed, and if there is no time limit I am usually one of the last to leave. If possible I like to go through...

Does anybody know where can I find something about testing machines? Something about main types, how do they operate etc.

Homework Statement Testing golf ball aerodynamics.? how? i need a simple way to test the aerodynamic properties of spheres with different surfaces. i was thinking of doing it with liquid as in this video is there any other way i can do it or perhaps a way i can do it the way they...

Whats the easiest way to test the max output of electricity induced in an air coil. I will wire it 3 phase delta. (or double delta) Will I need a resistive load attached for current flow? What should I use? How do I test? Use a multi tester? Is there math I can use to estimate the amount. I...

I am currently preparing for a few wind tunnel tests on a NACA 2412 airfoil. The lab technician told me that before I can use the tunnel, I need to provide solid proof that the models will be able to hold up in the wind tunnel (up to speeds of 110 mph (30 psf)). In the technician's own words...

Does anyone know if a Na2CO3 solution will change in pH when you leave it for a month? Will the pH go up or down? I thought maybe the CO2 would escape which would make the pH go higher?

Group properties: 1. \forall a, b, c \in G, (a * b) * c = a * (b * c). (associativity) 2. \exists e \in G such that \forall x \in G, e * x = x * e = x. (identity) 3. \forall a \in G, \exists a' \in G such that, a * a' = a' * a = e (inverse) Instruction: Determine whether the...

Methods of laboratory fatigue testing?? I have had a try at this question but don't think the answer was enough. Can someone please check it and give me the correct answer. Question Outline the methods of laboratory fatigue testing and the results likely to be obtained. (10 marks)...

I am designing an antenna for a consumer product. The consumer will be very close to the device. I have designed antennas for products like this many times before and have the proper equipment to do so. It's low power, meets all FCC regs for our band etc... I am tired of doing the...

I'm trying to solve a problem from a practice test I was given. It says. Determine if the sequence is bounded and if it's decreasing or increasing: a = \frac{arcsin(1/n)}{arctan(1/n)} I don't really know where to start as I don't remember seeing how to test sequences for boundaries or anything...

In my work we are suffering now from a problem of magnesium in water that we are using for drilling, we need test kit to test magnesium oncentration we could not use photometric analysis or any other complicated device we need method of testing depend on titration reaction could anyone help me

Homework Statement A random sample of 30 rats has 18 females and 12 males. If last year's proportion of females treated was 0.65, do the above data confirm that this year the proportion of females is different than last year? Homework Equations p = treated / total If using standard...