Test Definition and 1000 Threads

So ye the test begins in 2 months, and i will need to memorize all the phyisc book, its like 300 pages of good ol' physics, conitaining everything everything from electromagnetic induction, alternating current, lasers, wave osscilaitons, sound, em waves etc etc. i would like to ask about your...

While I think that the phenomena of Quantum Entanglement exists, it's real; it's interesting to understand more about it. How does QE/QM explain more mismatches (relatively to simple probability calculations) in Bell's test at wider angles? Or alternatively: Why does/would QE result in lower...

I am not sure if am suppose to consider this charge q, released in the space where there is no friction, or if it is released where there is friction... am I too far from the answer? Because I would assume that it will be in decreasing acceleration. Very confuse with all this topic. Thanks!

Hello everyone I'm new here: So I was about to write some SAS or R to do the following, but now I'm getting old enough to realize most things I think of were thought of before (usually by people way smarter than me). I've done some googling, but I haven't found the golden answer yet. I'd...

I am testing a certain part on a camera. So l was thinking of taking a set of measurements and then change that part and take another set of measurements.After having those two sets of data l wanted to do a chi-square test in order to see if variations in how the two parts perform is due to...

New "loophole free" EPR test with photons by Wittmann et al Recently posted under Recent Noteworthy Physics Papers, https://www.physicsforums.com/showthread.php?t=127314&page=10: Bernhard Wittmann, Sven Ramelow, Fabian Steinlechner, Nathan K Langford, Nicolas Brunner, Howard M Wiseman...

Hi, What does rated output in a transformer signify? Is power same(or almost same) on both sides? In short circuit test, we apply reduced voltage to HV winding so as to circulate rated current in HV. This will cause rated current to flow in LV. But as per definiton of rated current...

If we were to introduced a set of un-entangled, but same polarized, photons as control experiment what would the results be of the control experiment? So we have the following three cases: Bell test Experiment: Send entangled photons Result is that P(-30,30) is not equal to P(0,30) + P...

While studying electricity we always take point charges to calculate force between them according to coulomb's law.And to calculate the electric field around a point charge we take a test charge which is small. My question is: 1.What is the definition of point charge and test charge...

Note: This is not strictly a homework problem. I'm just doing these problems for review (college is out for the semester) - but I wasn't sure if putting them on the main part of the forum would be appropriate since they are clearly lower-level problems.(Newbie) Homework Statement The...

I had a bit of trouble in testing series like this for convergence $$\sum_{ n=1 }^{ \infty } \frac { 1 }{ 2n+1 } $$ If by the comparison test, ##\frac{ 1 }{ 2n+1 } < \frac{ 1 }{ 2n }## for all of n>0, and ##\lim_{ n \rightarrow \infty} \frac{ 1 }{ 2n }## =0, then the series should be...

Homework Statement So fx is how much f changes when you change x. Thus fxx is the rate of change of fx, or geometrically how fast the functions slope is changing. The same can be said for fy and fyy. But what about fxy and fyx? Could someone please explain to me what they mean? I want...

Homework Statement (a)\;\sum^{\infty}_{n=1}\frac{n-5}{n^2}\;(solved) (b)\;\sum^{\infty}_{r=1}\frac{2r}{1+r^2}\;(solved) (c)\;\sum^{\infty}_{n=1}\frac{\cos^4 nx}{n^2}\;(solved) (d)\;\sum^{\infty}_{n=1}\frac{3^r+4^r}{4^r+5^r} (e)\;\sum^{\infty}_{r=1}\frac{r^r}{r!}\;(solved)...

For f(x) = loge(1-x) Clarification: The question isn’t loge(1+x), it’s loge(1-x) a) Find the MacLaurin series: f(0) +f'(0)x + f''(0)/2! + f'''(0)/3!...etc My question is, to what extent do I keep applying the series to, since the series goes on forever and there are no constraints...

Homework Statement I'm trying to determine if Ʃ 1/(3^ln(n)) converges. Homework Equations The Attempt at a Solution The preliminary test isn't of any help since lim n→∞ an = 0. I tried the integral test but I couldn't integrate the function, and I don't think it's the best...

Is it true that only a NMR test is able to detect the effectiveness, quality, quantity of a product? That it is able to detect wrong raw material, over-reaction, or isomers occurring during synthesis? But what about the other tests like GC/MS, HPLC/GC, HCLtitration, meltingpoint test. Is one...

a UK company got $10M to build it, see here http://www.greentechmedia.com/articles/read/liquid-air-for-utility-scale-energy-storage/ . Can this be at least hypothetically feasible or is it more like pure quackery for stupid investors? ETA: to clarify, I don't doubt that it would "work" the same...

Hi, I came across an engine performance graph as attached. I have basically two questions looking at that: 1.To do any engine testing we keep some parameter constant - May be throttle position or applied load (torque) or speed or power. What is kept constant for this test? 2.In the...

I have a problem of knowing whether or not I am ready for a test. The difference between math and physics is that in math there's going to be a finite amount of question types and the practice problems is sufficient to know if you are ready or not, the problem being with physics is that the...

I decided to track down and read the original article in NYT reporting on Einstein's successful prediction that light would bend around the sun. It was not on the front page but maybe around page 11 or so. You can read it here...

Homework Statement I'd always used the 2nd derivative test for the nature of stationary points. But I came across this equation in one of my exercises, for which the test doesn't seem to work at all. Find the stationary points of: y=(x^2-1)4, stating the nature of each. Homework...

Homework Statement Determine whether the series is absolutely convergent, conditionally convergent, or divergent. ##\sum _{n=1}\left( -1\right) ^{n}\dfrac {n} {n^{2}+1}## the sum goes to infinity. Homework Equations Theorem for absolute convergence. Test for divergence The Attempt...

Homework Statement ##\sum _{n=1}^{\infty }\left[ \left( -1\right) ^{n}\right] \dfrac {\sqrt {n}} {1+2\sqrt {n}}##Homework Equations Alternating Series test, Absolute convergence theorem, p-series, and test for divergence. The Attempt at a Solution The alternating series test tells us that the...

I'm becoming more and more convinced that light isn't the only particle that can interfere with itself, and that the behavior may instead be a function of a particle's level of interaction. The multi-galaxy collision we witnessed not long ago may have been the first time we've had the scale...

Homework Statement (Edit) SERIES of n--> infinity ( -1/n)Homework Equations The Attempt at a Solution First tried ratio test, ended up with 1 so it was inconclusive Then tried integral test, but realized it's not a positive function Now I'm stuck =[ Any hints/advice would be nice

This isn't really homework, but I figure this is the most appropriate place to post this... Please do say if you think there is a more likely place it will get answered - I'm new! Homework Statement I am trying to calculate the muzzle velocity of an air rifle. I can find the time of flight...

my sister asked for help with a science test she had as preperation for her gcse's in this test was a table asking about heat transfer in a vacuum flask some parts of the table were filled in as an example but the question was would heat be lost through A convection B conduction C...

Homework Statement There are 3 parts to this problem: (a) \; \sum^{\infty}_{n=1} \frac{n^4}{4^n} (b) \; \sum^{\infty}_{n=1} \left( \frac{n+8}{n} \right)^n (c) \; \sum^{\infty}_{n=1} \frac{5^n-8}{4^n+11} The attempt at a solution (a) I've used the Ratio test. So, u_n=\frac{n^4}{4^n} and...

I need to test some web based programs, eg. PHP, MySQL, for my dads website but I can't be bothered having to ftp the server everytime I make a slight change to the settings. Is there anyway I could maybe simulate the server and the website on my laptop? I'm running Linux Mint if that's...

Homework Statement The activity of carbon, due to the decay of C14, is 16 disintegrations per minute per gram of carbon. The atomic weight of naturally occurring carbon is 12 u. What is the ration of C14 to C12 in the CO2 of the atmosphere? The half life of C14 is 5730 years. Homework...

Homework Statement Original Cross sectional area 24.63mm^2 original diameter 5.6mm Gauge length 35.07mm Extension length of the point on the graph i have chosen: 0.25mm Force at 0.25mm extension 3500N (or 3.5KN) Homework Equations (F/A0)/(ΔL/L) The Attempt at a Solution I have gone...

Homework Statement This was a question on my test. I had to choose the direction of the acceleration vector for each position. I was wondering if I chose the correct answers. Homework Equations a = gsinθ ƩF_{y} = N_{1S}( normal force) - W_{1E} ( weight force) The Attempt at a...

Homework Statement 2. Show that the function is continuous on the given interval. (a)f(x)= (2x+3)/(x-2) range:(2, infinity) (b)f(x) = 1- sqrt(1-x^2) range:[-1,1] 3. Prove that the following limits do not exist. (a) lim x tends to 0 ( absolute|x|/x) (b) lim x tends to 3 (2x/(x-3))...

hey guys i need help charpy impact test. i have attached my graph with the results we had. Does this seem correct? from the graph how do i determine the transition temperature T1 for the material where T1 is normally defined as the temperature corresponding to 50% of energy change between the...

Homework Statement After reading a few topics on this forum, i just realized that i had misunderstood the sequence v/s series theorem when it concerns the alternating sign. So, i went back to my notes, and I'm surprised to see that there is no mention of a series test. There is only a sequence...

Today sees a key test in the development of the SABRE engine for the Skylon Spaceplane project: http://www.bbc.co.uk/news/science-environment-17864782 What do members think of the prospect of this project? Seems to me that like all promising space ideas it would be great if it could get the...

Hi all, I am simulating torsion tests (after being successful with tension and compression tests). For tension and compression, I got a good comparsion with experimental and behaviour in tension is same as in compression (of course leaving the necking part). For torsion tests, I have...

Ratio Test, SUPER URGENT, help? Consider the series ∑ n=1 to infinity of asubn, where asubn = [8^(n+4)] / [(8n^2 +7)(5^n)] use the ratio test to decide whether the series converges. state what the limit is. From the ratio test I got the limit n-> infinity of [8^(n+1+4)] / [(8(n+1)^2...

I will do research on the vertical single strut. i want to ask if there is something interesting to study?

Series Comparison Test, URGENT help? Each of the following statements is an attempt to show that a given series is convergent or divergent using the Comparison Test (NOT the Limit Comparison Test.) For each statement, enter C (for "correct") if the argument is valid, or enter I (for...

I scheduled to take this April 28. Other than the following links, do any good study guides exist for it? For abstract algebra, I was thinking about skimming through my textbook and making note of the important theorems. Any recommendations would be appreciated...

http://www.nytimes.com/2012/04/20/world/asia/india-says-it-successfully-tests-nuclear-capable-missile.html http://www.bbc.co.uk/news/world-asia-india-17765653 There is some confusion here in India in the media as to what is meant by ICBM and whether a missile with a range of 5000 km...

When picturing electric fields, they are always based on a positive test charge. As you move on to potential difference and electrical currents, it is based more on electrons/negative charge. So, why aren't electric fields and fields lines based on a negative test charge instead of a positive...

Hi, Carry out a chi-squared test for the following table of frequencies of X ∼ Binomial(5,p) variates when (a) p = 0.3 x 0 1 2 3 4 5 Observed 162 346 303 149 36 4 frequency Now I know how to carry out the chi-squared test once I have...

Homework Statement The position of a 2.75x10^5 N training helicopter under test is given by...? vector r = (0.020m/s^3)t^3ihat+(2.2 m/s)tjhat-(0.060m/s^2)t^2 khat Find the net force on the helicopter at t=5.0s Express your answer in terms of ihat, jhat , and khat . Express your...

I'm given the following: 3/(n(2^(n-1))) I have to determine convergence using the limit comparison test. I've proved its convergent using the ratio test but am struggling with which term do I divide the above for the limit comparison test. Help?

Hello! I was working some practice problems for a Calc II quiz for Friday on the alternating series test for convergence or divergence of a series. I ran into a problem when I was working the following series, trying to determine whether it was convergent or divergent: Homework Statement ∞...

I am part of a CubeSat team at my school, and one job that I'm currently tasked with is figuring out how to build a transmitting/receiving system that will fit into our satellite. As a result, I am wondering if anyone knows if there are any good, affordable devices that will let me basically...

Homework Statement I've seen two methods that prove the integral test for convergence, but I fear they contradict each other. Each method uses an improper integral where the function f(x) is positive, decreasing, and continuous and f(x) = an. What confuses me is one method starts off the...

I just took a physics test today and there was one problem that I cannot figure out if I did correctly. The problem involves a catapult pictured here: http://i39.tinypic.com/a2t76h.jpg The bar is 2m long and has a mass of 3kg. The rock at the end of it has a mass of 5kg. The spring is .3m from...