What is Test: Definition and 1000 Discussions

Hi, I think the sample physics problem given by the ADA on their website is wrong. Can anyone confirm? It says: A ball is thrown horizontally at 20 m/s from the top of a building and strikes level ground 50 m from the building. How high is the building? When I solve this, I get 62m, but the...

Tonight I'm going to conduct an experiment that should settle the debate between relativity and creationism. If I'm right, space will remain still as time shoots forward by an hour.

Homework Statement Given that cot \theta = -12/5 and csc \theta < 0, find sec\theta. This was a question on a test that I drew a blank on, and I'm still not sure how to handle it due to my "teacher" repeatedly dismissing me when I try asking about it. Now, it occurred to me that this could be...

Hi, i just did a unaxial tensile test for a done specimen. What i got is the stress-strain curve, and poison ratio. May i know how can i determine the shear modulus G12 ? I gt E1, E2 and V12 and V21.

[b]1. Homework Statement [We have a 5 litre rectangular fuel tank which when full of fuel will weigh 3.7kg, I need to simulate the affect off the car pulling 1.5g in the corner by tilting the fuel tank on the lateral and longitudinal axis. What angle would be required to achieve the same affect...

Homework Statement So the dimension is R4. V1=[3 1 1 2], V2=[-2 -1 2 2] and V3=[2 1 2 1] Homework Equations The Attempt at a Solution The only way I know of to test for convergence is to make a matrix out of the row vectors of the vectors above (with the row vectors becoming the...

As Dodo noted, my prior test excluded some primes of the form 8n +/- 3, e.g. 29. I discovered a new property of the recursive series used in the prior test to allow a correction that apparently includes all primes of the form 8n +/- 3 but apparently includes no composites. The property of the...

Not too big of a question, it's more so just handling a certain presentation. T: M2x2-->M2x2 defined by: T(A) = (A + AT)/2. So my question is, how do I handle the fraction considering it will be a matrix?

So I have a question for you guys - what do you do if your test grades don't seem to be affected by how much you've studied? Here's the short version of my problem: Study a bit = ~85 and 2 out of 3 times so far, the highest grade. Don't study at all and get one hour of sleep = 80 (the...

A store Has a percentage lease at a rate of 2.5 percent of gross monthly sales. First -quarter sales were 3,500 for JAn. , 4,250 for Feb , and 5,990 for March. What was the total rent for the first three months? A:\$276.50 B:\$319.25 C:\$343.50 D:\$424.25I will take any help I can even if you...

Test Today...Quick Number Theory Question Let "a" be an odd integer. Prove that a2n (is congruent to) 1 (mod 2n+2) Attempt: By using induction: Base Case of 1 worked. IH: Assume a2k (is congruent to) 1 (mod 2k+2) this can also be written: a2k = 1 + (l) (2k+2) for some "l" IS: a2k+1 =...

Test Tomorrow...Help!...Fermat's Little Theroem Prove that if "p" is an odd prime, then a) 1p-1+2p-1+...+(p-1)p-1 "is congruent" to -1(mod p) attempt: Well I know from Fermat's little theorem, that all the constants on the left hand side will reduce to 1's: 1 + 1 + 1...1 (is congruent...

Homework Statement The original question is posted on my online-assignment. It asks the following: Determine whether the following series converges or diverges: \sum^{\infty}_{n=1}\frac{3^{n}}{3+7^{n}} There are 3 entry fields for this question. One right next to the series above...

Homework Statement Use the two path test to prove that the following limits do not exist.Homework Equations \lim_{(x,y)\rightarrow{(0,0)}}\frac{4xy}{3x^2+y^2} The Attempt at a Solution The book that I am using introduces the Two Path Test theoretically but does not show an example of how to do...

Homework Statement Consider the differential equation \frac{dy}{dx} = 2x - y On the axes provided, sketch a slope field for the given differential equation at the twelve points indicated, and sketch the solution curve that passes through the point (0, 1). Homework Equations \frac{du}{dx} =...

Homework Statement Q) Summation from 1 to infinity (1+(-1)^i) / (8i+2^i) This series apparently converges and I can't figure out why. Homework Equations The Attempt at a Solution (1+(-1)^i) / i(8+2^i/i) Taking the absolute value of the above generalization...

I am trying to implement a register file and a test bench in VHDL. I think I have the register file itself done ok so I just have to test it with the test bench now. I'm a little unsure as to how write the stimulus process however and was hoping that someone could point me the right way. This...

I'm currently working through a self taught program, coming up to my first test and have found a review that works well for what I need, I'm stuck on several questions and any help you can provide on any of them will greatly help! 1. Consider the function: y = x^2 - 2x - 8 a) State the...

Hello, I am fairly new to econometrics and have an assignment that I would like some clarification with. My regression involves regressing wage on various variables including dummy variables for white, black and asian. I have run separate regressions using subsamples for specific races so...

Hello, if I have a set of functions of the kind \{ f_t | f_t:\mathbb{R}^2 \rightarrow \mathbb{R}^2 \; ,t\in \mathbb{R} \}, where t is a real scalar parameter. The operation I consider is the composition of functions. What should I do in order to show that it forms a Lie Group?

Given a power series, what is the condition on its coefficients that means the ratio test can be applied?

Hello! Long time peeker, first time poster. I recently made a GR joke/brainteaser on a pop sci blog I frequent, and the tirade of nutty reactions it provoked drove me to an agitated contemplation of the matter, which gave rise to a few ideas. I was thinking that maybe a Gallileo type...

Homework Statement Test the set of {1, ln(2x), ln(x^2)} for linear independence in F, the set of all functions. If it is linearly dependent, express one of the functions as a linear combination of the others. Homework Equations N/A The Attempt at a Solution I know if [ a(1)...

Homework Statement Investigate the convergence of the following series. (2n)!/(n!n!) The Attempt at a Solution Number one, I don't see how they get that if an = (2n)!, then an+1 = ((2n+2))!, it should be (2n+1)! Number two, I don't see how they go to the second step, why is the second step...

Hi all I am trying to design a test that can be carried out on a valve to calculate the pressure drop and flow coefficient through said valve. i need to have a 6 bar inlet pressure into the valve and the ID of valve will be 50mm. the fluid i am proposing to use is water. My design is to have...

Is the converse of the ratio test true?

I took the GRE General Test earlier this week. The verbal and quantitative reasoning sections were easy, but I was overwhelmed by the analytical writing section. How does one organize a multi-paragraph response in only 30 minutes? Due to the time constraints, I was only able to give partial...

Alternating series test: If $\{a_n\}$ is positive and strictly decreasing, and $\lim a_n=0$, then $\sum(-1)^n a_n$ converges. Is the alternating series test still valid if "strictly decreasing" is omitted? Give a proof or counterexample.

It asks "use remainder estimate for integral test" to find series accurate to 3 dec? Homework Statement It says "Use the Remainder Estimate for the Integral Test to find the sum of the following series to three decimal places of accuracy." \sum^{\infty}_{n=1} \frac{1}{n^{3}} Homework...

Test for convergence: $\sum_2^\infty\frac{1}{n(\ln n)^p}$ when $p<0$. My working: Consider the function $f(x)=\frac{1}{x(\ln x)^p}=\frac{(\ln x)^q}{x}$ when $q=-p>0$. In order to use the integral test, I have to establish that $f(x)$ is decreasing for $x\ge 2$. How do I proceed?

Test for convergence: $\sum_1\sin\left(\frac{1}{n}\right)$ My attempt: $\sin\left(\frac{1}{n}\right)\sim\frac{1}{n}$ Since $\sum_1\frac{1}{n}$ diverges, $\sum_1\sin\left(\frac{1}{n}\right)$ also diverges by the asymptotic convergence test. Is that correct?

Hello, I'm a student of mechanical engineer and currently doing a project on "fabricating a torsion test equipment". I'm just wondering about my torque calculations. My design is quite simple, consists of: - angle iron (frame) - torque angle gauge (to measure angle of twist) - 2x...

how is bayesian inference actually applied? Say I have (100samples) a series of random numbers between 1 to 10. How do I test for the hypothesis that "there is a bias for the numbers 5,7" ?

Please help, A vehicle enters a test section of straight road at s = 0 with a speed of 50 km/h. It then undergoes an acceleration which varies with displacement as shown. Determine the velocity v of the vehicle as it passes the position s = 0.30 km. Thanks!

Homework Statement So I just had a Physics test and I couldn't get the solution to this problem. I was hoping someone could tell me how to do it correctly. This isn't the exact wording, as I already forgot it, but here it goes: A skateboarder moves on his skateboard horizontally 3.2m, in...

Homework Statement Homework Equations The Attempt at a Solution I have no ideas how to continue. I also tried the comparison test but I don't know where to start. Please guide me...

The sister of my girlfriend gave birth to a baby suffering Lowe syndrom. The baby who is now a child of 5 years old had been diagnosticed by his symptoms (cataracts at birth, problems with his kidneys, mental problems+convulsions and more medical tests that I'm not aware of). Just to give you...

http://www.parade.com/askmarilyn/2011/12/Sundays-Column-12-25-11.html Would someone please explain this to me? It goes against my intuition as well. ---------- Post added at 11:19 PM ---------- Previous post was at 11:05 PM ---------- I think the answer should be 1-P(chosen no...

Fun Problems! Evaluate the following: 1. \( \displaystyle \sum_{n=1}^{\infty}\frac{\left( 1+\dfrac{1}{1!}+\dfrac{1}{2!}+\cdots +\dfrac{1}{(n-1)!} \right)}{2^{n-1}}\) 2. \( \displaystyle \sum_{n=1}^{\infty}\frac{1+2+2^2+\cdots+2^{n-1}}{n!}\) 3. \( \displaystyle...

I read here http://www.eoht.info/page/Genius that henri poincare got a 35 on an iq test. I think that is really interesting, if its true! I've heard that people with mental deficiency score in the 60's, so 35 would be really low! I used to think iq meant something years ago, but I dropped...

Has anyone used a home DNA testing service? I was looking at 23andme service. The reviews are pretty good and it's only $100. Could be interesting. What do you experts think? Worthwhile?

Hi everyone! Lately I have been trying to improve my typing speed, and have been playing a game called Type Race, where you type various short passages (the passages are selected at random from a text bank) and your score in WPM is recorded. What I want to do is determine whether or not my...

Dear All, I have two functions that are defined on a table, i.e. f1(x,y), f2(x,y), where x and y are bin indices, and 1\leq f1(x,y) \leq 1 , 1\leq f2(x,y) \leq 1 . I would like to perform some test to show whether f1(x,y) and f2(x,y) are significantly different. Is there some way to do...

Test Tube Yeast Evolve Multicellularity The evolution of multicellular organisms have always been poorly understoond. Recently, scientists managed to demonstrate the evolution of multicellularity in yeast cells through artificial selection.

This is my first post. The sticky on Latex is very useful. Looks like I will be learning the code for formulas. Would like to know if you can test the code without posting to the board - how to play with the code and view results locally first. I am also trying to attach an image. Darn -...

Homework Statement Had a test today and had to do these problems. I just want confirmation on whether or not I did it correctly. (One) A sledder is at the top of a (frictionless) hill. He has an initial velocity of 5m/s, and his weight with the sled is 30 Kg. B) What his his velocity...

Help me! I am looking for a test method that will allow me to sample process air and measure the sodium content resulting from reactions with sodium hydroxide. This will be in the ppb range. Any suggestions or possible methods would be helpful.

Flame tests are used to test the color that a metal produces when heated and the electrons release energy when falling back to the ground state. This i understand, but why does the procedure only test the metal part of the salt? In other words, why does the anion part of the ionic compound not...

Hello, I have 2 questions: First, where can I find the best graduate schools for PDE & Probability? I'm thinking MIT and NYU are really good, although I could be wrong. Second, I was wondering if my expected math background is good enough to get into the 90th percentile on the GRE...

hi i have a physics questions about sound Sound waves are used to detect faults in girders. a cro is used to detect these faults, a pulse producer and a detector is placed on opposite sides of the detector. The safe detector has a upwards spike at 0microseconds and at 10 microseconds. The...