Exam Definition and 886 Threads

given that $\left[ f(x)=x-2, \quad g(x)=\dfrac{x}{x^2+1}\right]$ find $f(g(-2))$ (A) $\dfrac{-11}{5}$ (B) $\dfrac{-4}{17}$ (C) $-3$ (D) $\dfrac{14}{85}$ (E) $\dfrac{-12}{5}$ _____________________________________________________________________________ Solution find $g(-2)$...

Hi, I am an undergraduate Physics student and i have an exam on c++ programming next monday, what are the basic things I have to know in order to perform well in the exam? And how is c++ applied in physics?

can anyone explain why the voltage reading is negative for the resistor over a time period , yet the capacitor reading always stays positive ? In AC generation the voltages goes from negative to positive, how exactly does this affect the circuit components voltages? I am not sure how AC affects...

https://pmt.physicsandmathstutor.com/download/Physics/A-level/Past-Papers/AQA-Old/Unit-5/June%202015%20MS%20-%20Unit%205-2A%20AQA%20Physics%20A-level.pdf mark scheme question 2 very simple question why is the change in wavlength not 656.05 - 656.52? instead. The difference being in the mark...

I assumed that i had to take 5 time constants which would give the time taken to charge fully i assume then divide by 10 giving me a total number of readings of 34 , the answer is 6 yet they only used a single time constant to determine the number of readings? as this give me an answer of 68 or...

have a Summer Exam , at the begging of next week on all topics that we have done , so I decided to do Algebra , but I forgot have to do it , because it was a while ago, can anyone show me the method again please to memorize. Thanks in advance . Workings : add 4x+5=9 3x+6=9 9/3 =3/3 3x=3

I will be taking a very important Physics test next week based on advanced physics topics. I realized that generally i am able to solve the questions successfully on my own. But the problem is when i take mock exams i seem to get “panicked” and miss details, or use wrong values. After the exam I...

Hey, I’m new here .Good to join you all .. I need your help as I don’t know how to study maths . I am always distracted. I even sleep well. I don’t use my social media account or have phone with me still I can’t concentrate. When I start doing maths I feel like I have forgotten everything I...

Hi All, I was trying to help someone in a question for the actuary exam. I wonder if there is a mistake or whether I am missing something obvious here: What is the age a 90-year old man can expect to live given the probability an x year old man will live until age x+1 is given by ##...

Hi everyone. I have a one question about interest rates for my exam, if you help I'd be happy. A man buys car on instalment basis such that he pays 50.000 on signing of the contract and remaining in 4 equal instalments of 20.000 the first is being paid at the end of first year and so on for...

1. Homework Equations E=mc^2 Relativistic mass equation given in the question The first part of the question: I understand 200 MeV is the energy lost as it initially moves with 200MeV however is brought to rest and thus this total kinetic energy must have been transferred from the 'two...

So I need a bit of advice because I feel like crap right now. I'm a first year student right now majoring in physics, and I happen to be taking a criminology course as a breadth/elective course. I barely studied for the midterm exam because I thought it would be easy. Lo and behold I got 50% on...

Homework Statement This graph was given, which describes the current through a resistor, as a function of the voltage. Then, we were supposed to find the resistance of the resistor when 3V<V<5V. But it changes throughout this range, doesn't it? Because in the answers (Mind you, this is the...

<Moderator's note: Moved from a technical forum and thus no template.> Hello all, Earlier today I had an electromagnetism exam, and it seems to me that this problem is unsolvable. There's just too little information given. A proton enters an uniform magnetic field. It's initial speed v is...

Hi guys, Good afternoon, I study at the Federal University of Rio de Janeiro, I'm a undergraduate student from the Physics School. I like all the subjects, but the only subject that I never got on so well in school was textual production (although I passed), and in pre-university courses, it...

I graduated 22 years ago in Electrical Electronic Engineering. I haven't sat an exam since. The fact that I graduated at all I think was a minor miracle (I suffered terribly from exam stress - I only scrapped through due to my project and dissertation work being quote ' refreshingly good ')...

I am very worried because of my 200-125 exam that I do not understand how to prepare such a difficult Exam in less time. Can anyone solve my problem? I need a material from which I can prepare my exam in the shortest possible time and easy to Pass my exam with good percentage...

Hi, I was wondering if anybody would be willing to point me in the right direction for solving the following question. The questions is as follows: A 10000V RMS (primary) to 415V RMS (secondary) transformer rated 400kVA has the following resistance and reactance: Rs = 3 ohms Xs = 10 ohms A...

Took the calculus 2 exam yesterday. 30 question exam. Was on a roll from questions 1-18 I think k only had one unanswered at that point, the test got harder and harder and once I hit question 20 I felt pretty defeated. Once I got to the questions asking about finding volume and surface area of...

what is the integral of 2^(2x)? need help tonight, exam is tomorrow teacher says the answer is: 2^(2x) / 2Ln(2) why 2 times Ln(2)?

Hi! There is this question in my practice exam: How many ways can all the letters in the word ROCKET be arranged so that the vowels are always together? The answer is 5! x 2. I understand where the 2 is coming from. What I don't understand is the 5. Shouldn't it be 4!, since we already...

Hello. My Gifted and Talented Education (GATE) exam is upcoming in a few months, and I am having trouble finding practice and samples. I am in Y7 right now, exam is next year and I am trying to enter an advanced school for year 9. I live in Western Australia, but please do not restrict an answer...

hello, im in bachelors mechanical engineering programme and my thermodynamics papers are in few days one question is related to heat exchangers or forced convection, but our professor has hinted that in the exam the question regarding heat exchanger, forced convection will be a case study of a...

Homework Statement The Attempt at a SolutionSo I first tried by saying consider a time t in which mass m is directly above the origin O. I.e., mass m at the Cartesian coordinate (0, 4l/3). I wrote a = a(t) as the extension function of the spring, which has 0 natural length. So, I applied the...

Hey! I'm a first year physics undergrad and my finals start on the 17th ( 17th - calculus, 19th - physics, 21st linear algebra) and I was wondering if I could have some advice on how to study or whether or not the way I am studying is a good idea/ how to improve it. I don't really have a...

I am taking the second semester of physical chemsitry (quantum, spectroscopy, and some stat mech). I was wondering if there are any resources outside of the ACS study guide and open course ware. I'd really like some practice tests if possible so I can see what I need to study. Also, any lecture...

A machine consists of two components whose lifetimes have a joint density function: $f(x,y) = \left\{ \begin{array}{ll} \frac{1}{50} & \quad x \geq 0, y \geq 0, x+y \leq 10 \\ 0 & \quad Otherwise \end{array} \right.$ The machine operates until both...

Homework Statement Find the value of the sum (Infinity) Σ 2/((n+1)(n+3)) (n=1) Homework Equations Integral test Partial Sum Formula = k/2 (a_1 + a_k) The Attempt at a Solution Admittedly I started off this problem the wrong way. I used the integral test thinking I might get an answer...

What chapters from Morin's Introduction to Classical Mechanics Textbook will help me prepare for the F=ma exam? I also have the Feynman Lectures and the Halliday Resnick textbook. Any help would be greatly appreciated! :)

I got accepted to UCD this fall and am now taking physics. I have been working really hard, I read the book, did the work - which was very challenging and I didn't do very well on it. So I have been working even harder. It's okay to mess up on homework, but the work is surprisingly challenging...

Homework Statement Question: https://imgur.com/a/8rUw1 Graph: https://imgur.com/a/Z1oBO Homework Equations Answer for Q1 (Just the formula) : https://imgur.com/a/uesqN The Attempt at a Solution I have realized that from 1-2, there is an increase in pressure, decrease in volume and increase...

I really want to get an A on this first exam. I am a pre-med, and i enjoy studying physics. But I'm always learning at a slower rate which kind of annoys me internally. I had a major slip up from a 3.94 to a 3.56. And I can redeem myself with physics. I'm not sure how I can start. I have almost...

Hi Guys, I will have my first exam for algebra based physics October 7. How should I start to review? The questions in the book are simple in my opinion? What do guys suggest?

Hello everyone, This is my first post here Firstly, I'd like to start by saying that it's my best intention to follow the rules on this forum. Therefore, if I've posted this in the wrong section please forgive me, I will try and learn the ropes quickly. One of my students has given me some...

1. The problem statement, all variables, and given/known data So I am studying for the ASOE physics test. I came across the following question where I can't really understand the answer to it: The actual answer is: http://prntscr.com/fum35c Could someone help me and explain what they are...

Hello everyone, In this post, i am discussing on how to prepare for an exams or to get good marks in exams. Step 1 :> Preparing to Study (a) Start studying early. Give yourself more than enough time to review the material that was covered in class. You might want to gauge how soon to start...

I presently teach physics to high school sophomores and we are spending the entirety of this upcoming week preparing for the final exam. However, many of my students have "checked out" and are resistant to working or studying. Review packets and problems only seem to inspire a small few...

Please, can you give me a site where the physics of particle accelerators is explaimed with numbers and equations to high school Level? I found the site of the department of Energy and the cern but there are not equations like the lorentz force and the oscillating fields... I need something a...

Hi, I am just oging into Physics exam year and I am curious what I should expect in the course (High School) I am just wondering ifanyone knows and would be kind enough to help me with this? Thank you to anyone who does.

Hello all, I am a third year physics and math major at a quarter system public school. This year I've been getting pretty decent grades and achieved a 4.0 last quarter on 4 upper div math and physics classes. This quarter I am taking Topology II, EM Waves, Thermal Physics and a breadth class...

Homework Statement trying to do question C Homework Equations I know my answer to C cannot be right because it's worth six marks, any help or tips would be greatly appreciated. :) The Attempt at a Solution

1. The problem statement, "all variables and given/known data A solution of nitric acid, HNO3, of concentration 100 g dm-3, can be used to artificially age wood. A sample of nitric acid was tested by pipetting 10.00 cm3 of the acid into a 250 cm3 volumetric flask and filled up with deionised...

I am doing a review for a Dynamics exam, but I am having trouble with this one question (below). Please note the top of the picture contains the answers. What I have done is make a free body diagram that includes the tension of the cable and the weight of the rider/swing. So according to my...

Homework Statement Determine all member forces and state if they are in tension or compression, in particular I am looking for member AE and AB[/B] Homework EquationsThe Attempt at a Solution Ok so we are supposed to redo the problems from our exam, only I can't figure out how to find the...

Does grades on transcript matter when you apply for postdoc positions? If you fail one graduate level course, will that affect your getting a postdoc position?

I wrote a Calc II midterm today. Things went quite well, except for one question. I left it blank, as I did not have sufficient knowledge to write anything that made any sense. The question was worth 10% of the exam mark. This question was about a part of a section we covered, but this part had...

It seems Lev Landau created an entry exam to test his students, and the exam was known to be ridiculously hard. To get an idea as to how hard the test really was, I've been scouring the Internet for problems Landau proposed... so far I've managed to find only four. Electrodynamics A dielectric...

Hello all, I am a 19 year old female currently in my first semester of engineering school. I have taken other classes such as Physics I and Calculus I & II and done pretty well in them. Today I got my statics exam score back and received a 60%...the average was a 72%. A 60% puts me at the very...

kind of happy as I studied very little due to depression and severe craziness that I am afflicted by.

Homework Statement A system of two blocks (each of mass M) are connected by a spring with spring constant k. The system is shoved to the left against a wall and the spring is compressed a distance D. The block(s) are then released. Determine the period of oscillation for the system when the...