Review Definition and 459 Threads

I just finished taking a year-long undergraduate analysis sequence. The texts I used for this sequence were the first eight chapters of Rudin's PMA (everything before multivariable calculus) and Spivak's Calculus on Manifolds, as well as a little bit of my professor's lecture notes on...

Hi, I am a junior and a math major, and I am almost done with my year-long abstract algebra sequence for undergraduates. While I found the materials interesting, I feel like I got lost at some places in this course, and I would like to review (or in some topics, relearn) the materials that I...

Just a few questions from a review packet I'm stuck on, any help would be appreciated! 1) The moment of inertia about its axis is given as .5 mr^2. If this cylinder rolls without slipping the ratio of it's rotational kinetic energy to it's translational kinetic energy is a. 2:1 b. 1:1 c. 1:2...

Hi, Does anyone know of a good SO(10) review paper with the basics of SO(10) model building and its phenomenological implications? I've looked around, but couldn't find anything except for the original Georgi, Nanopolous, Mohapatra,... papers. Any suggestions? Thanks, -Andre

Homework Statement Find the solution of the following initial value problems: (a) y'' - 2y' + 5y = 0, y(π/2)=0, y'(π/2)=0 Homework Equations Just know to "guess" y=Cert, how to bring in Euler's formula, and that sin(x) is odd while cos(x) is even The Attempt at a Solution...

Is there some review article which covers the most important literature? Something like this: http://arxiv.org/PS_cache/hep-th/pdf/0311/0311044v5.pdf but for lqg and spin foam models? P.s if there is also up to date list of string literature that would be terrific as well.

Homework Statement A 4kg object is fired with a horizontal velocity of 8 m/s from a cliff 122.5 meters high. a) How long does it take the projectile to hit the ground? b) How far from the base of the cliff does it land? c) What is its speed right before hitting the ground? d) What is the...

AP exams are right around the corner and I was looking at picking up a review book to begin reviewing Mechanics and EM topics. I'm curious which one to buy. From what research I've done it seems that Pelcovits' "How to Prepare for AP Physics C" is the most rigorous book available and is...

If you dehyrate 1-butanol, wouldn't you get 2-butene due to rearrangement? This is not a homework question. This is an mcat review question. The question asks: when 1-butanol is dehydrated, the new compound's heat of hydrogenation is most likely? The answer is between 30 and 33 kcal/mol It...

Homework Statement A force of 1 N pushing on a mass m1 results in an acceleration of 1.0 m/s2. The same force acting on mass m2 results in an acceleration of 3.00 m/s2. What is the acceleration a3 for the same force pushing the combination of m1 and m2? Homework Equations well I know...

Is this book worth of reading?

I'm kind of shaky on a lot of high school Geometry that is going more or less unused in my Physics and Calculus classes and I was wondering if there was a good book or place for me to go back to my "roots" and review the fundamentals?

I've made something...it's a very VERY simple device to store pressurized fluid without requiring constant energy input...i.e required energy is fed once to pressurize the fluid.I've attached 2 pdfs, one with the main text content, other with the corresponding images as stated in the text...

I need some recommendations for the *best* ap guide. I know princeton review is very popular, but some say is very simplistic and only covers basic materials. I also heard Barron's is pretty good at covering the material in depth. I really don't know much about McGraw Hill's 5 steps to a 5. I ap...

I am resuming my education after a two year break (due to a career change). I am a little confused as to how to handle my current situation regarding math. When I left school two years ago, I was ready for calculus having completed college algebra and trigonometry. Since then, my algebra...

Highly informative discussion It's in a foreign language but that's OK because there are excellent subtitles. I decided to remove URL because may be too controversial, but will try to give googlesearch keywords

What is the best review article, published in a peer-reviewed journal, introducing string theory?

Is there a compendium of peer-reviewed journals that have been shown to be wrong? I've heard of scientific journals that only have required two reviewers. How often does rubbish get by; not just typos and simple mistakes, but fundamentally unsound rubbish? Is there a remedy process for...

Homework Statement Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 m diameter and a mass of 250 kg. Its maximum angular velocity...

http://www.ncpa.org/sub/dpd/index.php?Article_ID=18512 Here's the short story: http://www.theregister.co.uk/2009/09/29/yamal_scandal/ And the long detailed one: http://bishophill.squarespace.com/blog/2009/9/29/the-yamal-implosion.html

[b]1. Homework Statement I am suppose to use polar coordinate data to find derivatives, ie x = r cos(theta) y = r sin(theta) r^2 = x^2 + y^2 [b]2. Homework Equations show dtheta/dy = cos(theta)/r show dtheta/dx = -sin(theta)/r...

physics review site?? im currently going into grade 12 and i want to review the material i learned from grade 11 because i think i forgot most of the stuff :/ could anybody recommend any good grade 11 physics sites that go through each unit thoroughly, thank you :)

Can anyone tell me how to get a translation copy of Pauli's much-praised article on Relativity written when was only nineteen ?

Can anyone give me some suggestions of some essentials, calc or non-calc, that I should review and be comfortable with in calc 3? I know trig sub is supposedly important, and I'm assuming other basic derivative/integration techniques will be coming up a lot too...a lot of topics are bound...

I took calc 2 6 months ago... and I am just wondering which parts of calc 1,2 i should review for both diff eqns and calc 3. should i also review linear algebra? which parts? (ie: eigenvectors, eigenspaces, row reduction)? also what content is heavy in diff eqns and/or calc 3? should i review...

1. This problem concerns a nonhomogeneous second order linear ODE L[y] = g(t). Suppose that: y1(t) satisfies the ODE with the initial conditions y(0)=1, y'(0) = 0, y2(t) satisfies the ODE with the initial conditions y(0)=0, y'(0) = 1, and y3(t) satisfies the ODE with the initial conditions...

Homework Statement I got this problem from K&K. A pedagogical machine is illustrated in the sketch above. Refer link : http://www.slideshare.net/brigittperalta/sol-maquina-pedagogica-1546585 . What force F must be applied on M1 to keep M3 from moving up or down. All surfaces frictionless...

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Could someone please check my work and provide insight on what I may be missing to complete the problem. The question's from Ray Serway's Physics For Scientists & Engineers 4th Ed. Vol. 1. Chapter 4. Review Problem #1. Page 95. Homework Statement A ball is thrown with an initial...

Homework Statement Find the unit vector that is parallel to the plane formed by \hat{x} + \hat{y} + \hat{z}, and 3{x} − 2{y} − 2{z}, and perpendicular to 2{x} + 2{y} − {z} Homework Equations The Cross product equation A x B = (A_1B_1) + (A_2B_2) +...+ (A_nB_n)The Attempt at a Solution I know...

Homework Statement I basiclly just need a little review and maybe some 1 to show me how to solve out the equation/and equation like it. here is an example: 2x+1 / x-1 + 1/ x+1 = ? Homework Equations ? The Attempt at a Solution ?

I've been studying for our final exam throughout this weekend, and I realized that there is a lot that I don't remember. So, instead of asking each individual question, I'm going to try to ask one from each concept that I don't understand. Quite a few of them I have absolutely no idea how to...

Homework Statement T1=300K P1=100kPa V1=1m^3 T1=T2=T3 P2=P3=200kPa V3=0.1m^3 Q: Air initially at 300kpa is contained inside a piston-cylinder device with a volume of 1m^3. The cylinder is equiped with a check valve allowing air to escape when the air pressure reaches 200kPa. An...

Hi, I am reviewing for an exam on Saturday and I'm looking at some old exams for the course and I came across the question. A tractor (t) is pulling a trailer (m) with a constant velocity. If the velocity is 20 m/s and m = 200kg and t = 500 kg the the force on the trailer dou to the tractor is...

Hi, I keep several technical references, but since I don't like carrying around pounds and pounds of books, I keep them on my Sony Digital Reader. It can also accept .pdf documents; if anyone knows where I can buy a .pdf FE/EIT Review Manual, I'd appreciate the info. Thanks, Chris

Ok, I'm reviewing for my exam and I'm having issues with a few of the answers they have given... Let me know what you think. This practice exam seems a little iffy to me... There seem to be mistakes in it all over. One question asked the angular momentum of the Earth and said the answer was just...

Does anyone know whether it is possible to get one's hands on the external review of a University's physics department? Are they available publicly?

Question is Problem 7: Joule’s paddle wheel experiment consists of a falling weight which spins a paddle-wheel in an insulated barrel of water. As the weight falls, the water warms up. Assume idealized conditions with no friction in the pulley, string, and bearings. How much does the...

Evo asked in another thread https://www.physicsforums.com/showpost.php?p=2079435&postcount=54 The short answer is no. The reviewers are human and subject to human bias. Bias is an intrinsic part of human nature. Scientific reviewers are not immune. The peer review process is not perfect...

Pendulum equations - HELP! review work, out sick Homework Statement What is the period ofa pendulum which makes thirty oscillations in 75.0 seconds? Homework Equations HELP! T = [l]\frac{}{}[/f] This is what I need! The Attempt at a Solution t=[75]\frac{}{}[/30] = 2.5 I...

As the title says, does anyone know of a good book or review article about point contacts (both quantum and "classical" non-quantized version) in AlGaAs/GaAs 2DEG? I am trying to find some information about their transport properties at MW frequencies (a few GHz), specifically information that...

Has anyone actually used Google Chrome? I have a limited monthly bandwidth allowance so I'd prefer not to download it purely for test purposes, but would like to know what you guys think of it. Please compare it with whatever other browsers you've used/are using. Thanks! phyz

Firstly, I'd like to quickly note that this isn't a homework problem, but rather a problem that I'm about to make up. I've done Calc IV already but recently my friend asked me for help on a problem involving the drainage of a tank and I got a little stuck in thought. I'd like to re-educate...

Homework Statement A student is standing on the top of a building and he throws an object into the air with a speed of 16 m/s at an angle of 25 degrees above the horizontal. If the building is 75 m tall, how far from the base of the building will the object hit the ground? Homework...

Homework Statement This question is something we got in our review booklet and I HATE projectile motion. An object is thrown horizontally with a velocity of 18 m/s from the top of a cliff. If the object hits the ground 100 m from the base of of the cliff, how high is the cliff...

Homework Statement Rhonda, who has a mass of 60.0 kg, is riding at 25.0 m/s in her sports car when she suddenly slams on the brakes to avoid hitting a dog crossing the road. She is wearing her seat belt, which brings her body to a stop in 0.400s. What average force did the seat belt exert on...

Is there a forum for movie reviews? If so, this could be moved there. However, this isn't really a review, its a warning. If you're only going to miss one film this year, make it Spirit. Yesterday, my wife and I decided to pump up the economy and take in a flick. She said Australia was the...

Recently I found a couple of articles that are critical of the peer review process. What are your thoughts about them? http://www.telegraph.co.uk/scienceandtechnology/science/sciencenews/3326091/Peer-review-the-myth-of-the-noble-scientist.html Article2

Homework Statement Fleas have remarkable jumping ability. If a 0.50 mg flea jumps straight up, it will reach a height of 36 cm if there is no air resistance. In reality, air resistance limits the height to 18 cm. Homework Equations K=1/2 m*v^2 The Attempt at a Solution I tried to...

Homework Statement A ball rolls up a straight incline. The dots in the diagram represent the position of the ball every 4 seconds. (The fourth dot is not intended to represent the turnaround point; the ball might still be on the way up at that point.) The instantaneous velocities at the...