Review Definition and 459 Threads

Hello, I am taking Adv. Calc, and we have a test next week. I am going to post a few questions that I have from the review where I got stuck. If you have any help, please steer me in the right direction! Question 1: Suppose sn <= 0 <= tn for n in N. Prove (lim inf sn)(lim sup tn) <=...

in case of interest this got published in the journal Science, in July, and just now became freely available online. http://www.arxiv.org/abs/astro-ph/0510197 Mapping the Large Scale Structure of the Universe David H. Weinberg 4 pages, 1 figure. A brief, semi-popular review of large...

They go as followed: 1. A 30.0 mH inductor is connected to a standard electrical outlet (Vrms = 120 V; f = 60.0 Hz). Determine the energy stored in the inductor at t = (1/170) s, assuming that this energy is zero at t = 0. 2. What is the maximum current in a 5.00 µF capacitor when it is...

Hey everyone, I am stuck on this question: (2^1)(2^2)(2^3)(2^4)...(2^n) = 210 What is the value of n? I'd love to post what I have so far, except that the problem doesn't involve much work, so as soon as I have the first step I'll have the last...and I haven't yet gotten the first...

Review problem for classical, help please! Hi I just started my classical mechanics class, and I was given this: a bunch of problems (image attached) (and one that I pulled from the notes I didnt know how to do as well.) that I could do for practice to refresh for the class, problem is I have...

Tell us what book(s) you have read recently and what you think about them. Be sure to add in whether or not you think it is a specialized taste that will enjoy a title or if you personally don't like a particular book but think others might. And try not to give away surprises!

Excuse the lay question, but how do peer review journals work these days, with the advent of the internet? I've seen people post arxiv articles; is that peer reviewed? Are there any worth subscribing to? Which ones are considered the most professional?

http://www.springeronline.com/sgw/cda/frontpage/0,11855,4-40110-34-8894770-0,00.html?addToBasket Landing Your First Job · A Guide for Physics Students ( Rigden, J.S. 2002, Softcover, ISBN 0-7354-0080-6) $12.95 About this book This book is currently on sale (regular price : $25) and...

1. A ball A is thrown vertically upwards from the ground at a velocity of 20 m/s. A second identical ball is thrown vertically upwards, at the same velocity, one second later from a platform 10 meters above the ground. The two balls will be at the same height above ground when ... a. A is...

With all the crazy ideas that get thrown around in this forum, I thought it would be good to step back and review the mainstream view on cosmology in 2005. The field is advancing very rapidly, so it's possible that even the most reliable websites will be woefully out of date, both in terms of...

find the radius and interval of convergence of: \sum_{n=1}^\infty\frac{(-1)^{(n+1)}nx^n}{2^n} the radius is x<2 and the interval is [-2,2) are these two answers correct?

I still think the x! can be resolved 2 a polynomial and then solved normally,or can't it,cos my friend is already working on it and has began to mke progress. Or can't the x! be resolved let me know

I wasn't going to see this for a few weeks but was REALLY bored at work and there's a theater down the street. Go figure... If you liked the original Star Wars, even if you hated 1 & 2 (like I did!) SEE this one. It is dark and violent. There is no stupid Jar Jar kind of humor device, in fact...

Review Questions- Need Help! A hollow sphere is rolling along a horizontal floor at 5.00 m/s when it comes to a 30.0° incline. How far up the incline does it roll before reversing direction? I am not sure how to start this problem. I know the answer is 4.25m but do not know/understand how...

To prep for the upcoming AP exam, I got all of the AP Exams 1995-Present, but cannot find anywhere to check my answers for the free response sections online. Does anybody know if the answers are posted anywhere? :eek: this AP exam is going to be soo hard!

Okay I did my work but if someone would be so kind as to look at it and see if I am understanding. Questions 1. Explain why you would expect a BeF2 molecule to be linear but an SF2 molecule to be angular? BeF2 forms an ionic bond with 2 single bonds. Since Be is in group IIA it forms two sp...

Hello, I have been looking at various review problems to prep for an exam and there is one I could not solve at all. Here it is: A flat dance floor of dimensions l(x) = 20m by l(y) = 16 m has a mass M of 150 kg. Use the bottom left corner of the dance floor as the origin. Three dance...

Okay, I'm doing a movie review, and I need some helpful critiquing on how to perfect it. Thanks for any help you can provide. Thanks ***************************************************** Before you even buy your ticket for Meet the Fockers, you know you are in for a lot of “focker” puns...

Afshar 2 slit experiment--peer review I have looked all over the web--I still have not seen any peer review of this experiment. According to Afshar, it should have been done 3-4 months ago. Anyone know anything about this? Photongod

I am taking statistical mechanics this quarter, using the textbook Thermodynamics and an intro to thermostatics by Callen. The math in the derivations is from calculus, which I had 4 years ago and didn't really put all that much effort into. Consequently, I need a solid review of some...

Anyone who liked "Flatland", will love "Flatterland". It's a continuation of the story of "Flatland", from the PoV of A. Square's great-great-granddaughter: Vicki Line. Instead of "The Sphere", Vicki's guide is called "Space Hopper", and if you thought "The Sphere" heightened A. Square's...

I realize this is insanely out of place on the physics forums but: Does anyone know of a way to submit poetry for review/critique whether by peers or professionals without being scammed by the numerous sites on the net? I've been looking for a while now and figured maybe someone here could...

Basically my teacher hands us out a review packet for physics and says to do it if we want practice...Okay I do the packet and I have it done, now my problem is that the teacher didn't give out the answers to the problems so I have no idea whether or not I did it right...so I am hoping some one...

Previous PF discussion: https://www.physicsforums.com/showthread.php?t=17088&page=1&pp=15&highlight=Divining Dowsing: Journal of Scientific Exploration ...In 1986, GTZ presented in its series of publications a special report number 183 on a project in the northern dry zone districts of Sri...

Hey, I'm practising some exam review questions that i was given but i can't figure this one out A sunbather, drifting downstream on a raft, dives off the raft just as it passes under a briidge and swims against the current for 15 mins. She then turns and swims downstream, making the same...

Hello all Just had a question about interest: Determine how much time is required for an investmnent to quadruple if interest is earned at a rate of 7.1% compunded continuously. Would I just use the formula Pe^ r^t? And then just substitute values (say P = 0)? Any help is...

My physics teacher gave us a huge packet with some review problems that we should know how to do for the test. There are 3 that I have no clue how to do. 1.) A morbidly obese man weighing 500 Newtons stands 2.5 meters from the inner edge of a nail supporting a wooden platform. The...

First of all, thanks for anyone who helps me with this 1. Find the perimeter of an Isoceles triangle that has base angles of 36 degrees and an area of 580cm sq. The given answer is 126.4cm. 2. A designer plan the top of a rectangular workbench to be four times as long as it is wide, and...

Hey watsup guys, I'm up to my last test :biggrin: (YESSS!) this wednesday and while reviewing the practice tests I took some stabs at a few but would like to ask for a little help with them. I'll post the questions with my answer choices(bold) and appreciate any corrections, advice...

I need some help with some review questions for the test. I am trying to check the answers I get with the ones the teacher provided, bit I'm getting stuck. Knowing which equations to use etc... would be really helpful. What is the maximum weight an aircraft with a wing area of x m^2 can...

i already have like half of the sheet done but any help you give would be greatly appreciated. just telling me which formulas to use would be a great help. thanks a lot i already have answered 1 2 3 4 5 6 7 10 13 14 24 and 25 thanks again okay posted worksheet

M$ came up with a whole bunch of new precautions for xbox live that is able to detect if an xbox is modded. It looks to see if the harddrive is still the standard 8 gb and that it is running the proper operating system. Thus almost all xboxes... even ones with chips that turn off were baned...

Hey guys -> this is for a friend and i haven't gotten this far in our class so yeah if you could expain the answer that would be appreciated. the motor of an elevator can produce 14KW of power. The elevator has a mass of 1100Kg including its contents. At what constant speed will the...

nevermind, and can't delete. =)

I saw I, Robot last night. I haven't yet read the book, so I can't say whether it has much to do with the book or not. But it was definitely better than I expected. Nice action scenes, an okay story, and the robots were done very well. I'd say it was worth my AU$9.

I saw it today and this is one of the few sequels that's better than the original. There is much more depth to the story and a lot of emotional moments. It showed a much more human side of the hero. I recommend this movie. I'll give it a B+ :smile:

Doing a review for exams but some word type questions I don't understand, and another question that's not word type. Anybody that can answer please do, I do need to know to do it by Friday morning. Here they are... Question 1... An industrial plant is confronted with a problem of...

The first extra-solar planets detect are not likely canidates for life b/c a) the planets are too small b) their surface temp is too low for liquid water c) they orbit pulsars, which emit too much powerful radiation d) they are too distant from the star they orbit. I believe the answer...

Having trouble with this question. Any help would be appreciated. I have narrowed the answers down 1) A star which appears double when observed directly, and is held together by mutual gravitation is called? astrometric binary spectrophic binary visual binary

need help please. tonight if possible. I need to find the largest area of a rectangle with base on the x-axis and upper corners touch the parabola with the equation y=12-x^2 :smile: thanks :smile:

Hi, these are off of my final review sheet. Theres a lot of them but I think most my answers are correct :smile::smile: * = my answer. 1. Kinetic Theory accounts for the increase in pressure as a confined gas is heated by what? *An increase in particle motion, more violent and...

I never really post my stuff but you guys seem like a good group. First I will explain what project consists of and then I will post the project. Well we have to present in a group to the class as though we were a Newscast studio or something.. just give news like they do in cnn or any...

http://arxiv.org/abs/gr-qc/0404055

Alright, my teacher gave us a review sheet of problems for the test tomorrow, supposedly all the concepts will be covered on the test, and I've got NO CLUE where to even start on this problem. It supposedly has something to do with section 30.7 in Serway/Beichner's physics text, titled...

Hi all, I'm looking for a good review on how string theory accounts for inflation. I found a great review on 'classical' inflation by Linde explaining the paradigms in terms of GR and scalar fields but am looking for a good introductory review in terms of the string paradigm. I'm hoping to...

A Ferris wheel has a radius of 8 meters and rotates once every 15 seconds. A 10:1 scale model of the Ferris wheel also rotates once every 15 seconds. Which has the higher Angular Velocity? Solution: angular velocity = Change in rotation/change in time Do I use the formula v = rw...

11) the diagram shows 3 equally spaced wires that are perpendicular to the page. the currents are equal, 2 being out of the page and 1 going into the page. rank the wires according to the magnetude of the forces on them, from least to greatest. . x . 1...

Could you check these answers. thanks 1) In a purely inductive circut, the current lags voltage by? 1/4 cycle 2) Which has the greatest effect in decreasing oscillation frequency of an LC circuit? Using Instead: a) L/2 and C/2 b) L/2 and 2C c) 2L and C/2 d) 2L and 2C I picked d...

Hi guys, can someone recommend a good physics textbook/review book? I am very iffy on some of the physical concepts. I don't need a review book that will tell me the formula and give me a problem to plug it in with. I need to understand the concepts first before practicing. My physics book...

I'm working on a small worksheet for exam review that I could get some extra credit on. I've finished the problems posted below, but would like to know if they've been done correctly. If you can help on either, please do. ------------------------------ "[3] A 6.0kg block initially at...