Review Definition and 459 Threads

Homework Statement Making the light. While traveling in your car at a constant 12 m/s, you notice a traffic light 44 m in front of you turn yellow. You know that the light will turn red in 3.0 seconds, and that you can speed up at a rate of 6.0 m/s/s. You’re also aware that it takes you 1.0...

Im doing Final exam review this is the first question please check! Thank you! Homework Statement 1. Water balloon drop. You and your physics major roommate devise a plan to drop water balloons on classmates entering your dorm. Just as they cross a mark that’s 3.0 m from the door, you’ll...

Dont watch it. It was horrible. I mean HOR-RI-BLE. This bad guy is trying to steal all the water in bolivia. Yep, that's the plot. It's that stupid. He just wants to steal some water and sell it back for profit. Plus there is random action (I mean random) and characters just come in leaving...

Greetings. I've been doing some things for the past couple of weeks just for fun, but I have no way of knowing if I'm on the right track or not, so if anyone is willing to take a glimpse, feel free to point out any errors or say harsh thing, or throw tomatoes at me, because I need some...

I'm not sure how to tackle #6. I want to make sure my logic about the rest is correct. There's still a little fuzziness on how to show something is a subspace. I know it has to have the zero vector and be closed under scalar multiplication and addition.

SOLVED! Thank-you jhicks and Tedjn! I am taking a basic calculus course and have some weaknesses when it comes to trigonometry. In this case, it's pure trig. Homework Statement The question states: "Find all values of x in the interval [0,2pi] that satisfy the equation sin x = tan x"...

Here is the link to my review topics for exam 1. http://math.uh.edu/~bgb/Courses/Math4377/Math4377-Ex1-Topics.pdf 1.2 Does the solution set to a linear system change under elementary row operations? The solution set does not change under elementary row operations. What are independent/free...

Hello experts, I'm about to embark on a new line of research. Random Matrices as you might of guessed. Coming from a algebra/geometry background, I am looking for some simple papers along with some references you guys could give. I need to do a literature review in a few weeks, so please any...

I have a test Monday and I'm trying some review problems my professor gave us to study from. I'm not looking for answers I'm just looking for someone to help step me through a few of these problems. Thanks for any and all help you guys can provide. Homework Statement 3a). After starting...

Hi everyone In my attempt to understand the details of Stern Gerlach experiments and measurment issues in quantum mechanics, I have come to believe that there is a lot to be learned from some of the basic thought experiments like interference and Stern Gerlach described in books...

I have this review packet and I have a couple questions. Homework Statement Solve the fallowing by factoring and making appropriate sign charts. 2sin^2(x)>sin(x), 0\leqX\leq2\piHomework Equations The Attempt at a Solution Well my main question is, can I divide both sides by sin(x)? In doing...

Velocity, Acceleration, Displacement, Headache I have an exam tomorrow. Can you help me out with these physics questions? They are review questions that I am stuck on. 1) Distance is 45 km and it took 3 seconds what is the speed. If the displacement is 7 km north what is the velocity? *I know...

Homework Statement A woman of height 1.7 meters stands directly in front of a convex mirror 2.0 meters away. The mirror has a radius of curvature, R=-50cm. Find the location and size of a woman's image using the ray diagram and mirror/lens equation. ---------- 2. The speed of light in a...

Homework Statement Explain why the line <x,y,z> = <3,1,4> + t<4,-5,2> is parallel to the plane with equation 2x + 2y +z = 7 Homework Equations The normal vector of <x,y,z> [4,-5,2] and the plane equation 2x + 2y + z = 7 The Attempt at a Solution Well, I'm trying to review for the...

So I just started my Physics class over the summer about a week ago. For the first time, it is a course that uses Calculus a lot and so it will be a bit different for me although I do not think it will be too much of a difference. My current knowledge though of Calculus is very small and only...

Hey hows everyone doing, this is the first time I am posting HW. I need help with 4 problems which are from my test review. Attached are scan images of the test review sheet with solved answers. I need to know if I have done this right. Thanks. Homework Statement On image. Homework...

This is an interesting product because I know quite a few females who use it and I know some salons even use it. Bare minerals is a makeup kit. They claim it's made from crushed minerals and is actually good for the skin. They also say is free of preservatives, talc, oil, fragrance and other...

Could someone please check my work, I'm skeptical about it, but would like thoughts: http://indigojoker0.googlepages.com/Presentation1.pdf

For a project in my combustion class, I have to do a review paper on an area of combustion research. I don't know a lot about this field or the technologies that are at the forefront, so I was hoping the people on this board could help me out. I'm kind of a sci-fi geek, so I would like...

I found these forums while doing background research. Since there seem to be quite a lot of experts hanging around here, can you review my RBMK reactor diagram - http://commons.wikimedia.org/wiki/Image:RBMK_reactor_schematic.svg ? Any comments are welcome.

Test Review help! Homework Statement Two children whose masses are 35kg and 55kg are on a playground "teeet totter" which is 3.0m long. Where must the fulcrum be placed so that the children will balance? (35kg on left, 55kg on right) Homework Equations sum of T=0 The Attempt at a...

[SOLVED] Forces and Motion Midterm Review Homework Statement A bulldoezer drags a log weighing 500N along a rough surface/ The cable attached to the log makes an angle of 30 degress with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum...

Homework Statement Evaluate each of the following complex numbers and express the result in rectangular form: a) 4\,e^{j\frac{\pi}{3}} b) \sqrt{3}\,e^{j\frac{3\pi}{4}} c) 6\,e^{-j\frac{\pi}{2}} d) j^3 e) j^{-4} f) \left(1\,-\,j\right)^2 g) \left(1\,-\,j\right)^{\frac{1}{2}} Homework...

Got a quiz tmmrw and i want to know what the answers to these review questions are. :D 1.-The total consumption of electrical energy in the US is about 1.5 x 10to the11th Joules per year. a. what is the average rate of electrical energy consumption in watts? b. If the population of the...

Here is an article I submitted to ArXiv some time ago: http://uk.arxiv.org/abs/0708.0929 (Relativity without tears). It is about Special Relativity (in fact a sort of review of it) and contains nothing unorthodox at all (I hope), although the angle of view might be somewhat unusual. The...

i am attaching the file please reply me as early as possible

I'm studying for my logic final and I can't seem to find an answer for this practice problem: (Using < as proper subset since I don't have the right type) T_1 < T_2 < T_3... be a strictly increasing sequence of satisfiable L-Theories. a) Show that the union of T_n is satisfiable (over...

Hi (sorry if this has been brought up recently, but I don't see it and the search tool seems to dislike me at the moment). I'm a physics major in my 5th semester, and the time has come to start seriously reviewing for the physics GRE. Which review book would you most recommend? Do you...

1) Calculate the pH of a solution prepared by dissolving 0.370 mol of formic acid (HCO2H) and 0.230 mol of sodium formate (NaCO2H) in water sufficient to yield 1.00 L of solution. THe Ka of formic acid is 1.77 x 10^-4. a) 2.30 b) 2.09 c) 10.46 d)3.54 e) 3.95 2) The solubility...

In this forum there was one problem. Two heavy balls of equal mass M are attached to long light rod. The rod is held vertical and allowed to fall, say towards right. What will be the speed of each ball just before the upper ball touches the ground. I can interpret this problem in three...

Two crates, of mass m1 = 40 kg and m2 = 125 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 40 kg crate. The coefficient of kinetic friction is 0.15. Find the acceleration: Calculate the force that each crate exerts on the other:I am...

A 25.5 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley (Fig. 4-57). The coefficient of static friction between the table and the block is 0.400 and the coefficient of kinetic friction between the table and the block is 0.320. Sand is gradually added...

Ive been working this problem for the past hours, and i keep getting the wrong answer... can someone check to see what I am doing wrong, and please correct me.. Question: An 18g object moving to the right at 26cm/s overtakes and collides elastically with a 33g object moving in the same...

Review time; came across that question in the text...I DON'T KNOW! ...i hate this class. :"[

hello! i am designing a firetube boiler for my design project. could u suggest me some website where i could get interesting and relevant literature review on fire tube boiler. Thanking u in advance

Argh, I haven't done any calculus since gr. 12 and university calculus is killing me. Need some help with a few questions; and I know there are a few that I'm asking for on here, but they are only a few out of many (I've done most). Homework Statement 1. Solve the following inequality. (graph...

I completely forget how to do this... can someone give me a review on how to do this? For example: z=8e^(i(pi)/3) w=4e^(i(pi)/6) z+w= ? This is an example in my book but no steps are given for this, the answer they give is (4 + 2sqrt[3]) + (4sqrt[3] + 2) i I have virtually no...

I'm trying to build a comp for gaming but i don't know anything about modern hardware and searching google for "motherboard reviews" is giving sites that seem to assume i know what I'm looking for. when you guys are trying to find some of the best stuff on the market, where do you turn too?

Homework Statement Write the equation for the parabola. Vertex (0,0), axis along x-axis, passes thru (-2,-4). The Attempt at a Solution I thought since the parabola resides on the x-axis that I was supposed to use x^2=4py, with a parabola looking similar to this: However, the...

"When Peer Review Fails" NIF Debacle Anyone have or seen comments on C.E. Paine, M. McKinzie, T.B. Cochran, "When Peer Review Fails The Roots of the National Ignition Facility (NIF) Debacle", 2000 http://www.nrdc.org/nuclear/nif2/nif2inx.asp Some primary criticisms: -Cost escallation...

Is the scientific world, being based on peer review, in need of an overhaul for being based on a logical fallacy that "popular equals correct"? I'm only asking because someone is telling me not to trust the majority of scientists on a specific issue, namely second hand smoking. I don't really...

I am registering for a mechanics course for the fall semester, and would like to know what math to review to prepare myself. The course description is as folows: Thanks

A nice review of Dark Matter and Dark Energy, including discussions of the CMB and Inflation, arrived today at the arXiv: http://arxiv.org/abs/0706.2986 I think some people here would find it quite interesting.

QC test idea--Physical Review D This paper is to appear in Phys. Rev. D. I don't know when, just saw the announcement yesterday. http://arxiv.org/abs/astro-ph/0703566 Thermal fluctuations in loop cosmology Joao Magueijo1,2,3, Parampreet Singh4,1 1 Perimeter Institute for Theoretical Physics...

I'm starting grad school this fall for my PhD, and want to review material before I take my classes again. After talking to the department chair she was suggesting all students retake the undergrad core courses their first semester (Quantum, Statmecn/thermo, theo mech) so that they have a solid...

What are the best Text/Review books for: Chemistry Honors, AP Calculus, AP Bio, AP Enviornmental Science?? I'm looking for good textbooks that are easy to comprehend and gives you a lot of practice and allows you to think a lot. Likewise, I would like simplistic review books that go right to...

I just bought a book online for one of my classes for next semester. I just received the book today, and on the cover of the book says "Instructor's Review Copy." Does this have the same content as the regular student version of the book? What are the differences between the the books, if...

Homework Statement Figure a -q1(+)------q2(+)- x (Just the X axis with two positively charged particles at the opposite ends of it, basically) The figure shows two positively charged particles fixed in place on an x axis. The charges are q1 = 1.60 x 10^-19C and q2 = 3.20 x 10^-19C, and the...

Here is the link: http://www.thetroublewithphysics.com/Response%20to%20Polchinski.html"

A lot of us know Martin Gardner from his regular monthly recreational mathematics contributions to Scientific American, which were a major good thing about SciAm for thirty years. http://en.wikipedia.org/wiki/Martin_Gardner He will be 93 this year, still kicking though. Gardner fans may like to...