Exam Definition and 886 Threads

Electromagnetic radiation of wavelength 4.50 x 10^-7 m and intensity 800Wm^-1 is incident on the surface of a metal with work function of 2.02eV. Electrons are emmited from the surface and attracted to a positively charged electrode with a p.d. of 10V. Question: Assuming that each photon...

excuse me for my bad english, but I'm trying hard. 1. function f(x), for x>0 is defined with: f(x)=(x^4)^(x^2) ^ - potency find stationary points of the function f(x) on the interval (0,infinite). what exactly do i do here? do i use logarithm on both sides, and then i get...

Woo, this is on my final exam and i don't know if there's a formula or something to solve it. really need help. anything is appreciated. A converging lens with a focal length of 15.0 cm is placed 53 cm from a light bulb. Where would you place a screen to focus an image of the object? :rolleyes:

My final math exam is tomorrow, and I am having trouble with some questions as I go through this review package. I have the answers so its very frustrating to arrive at the wrong answer over, and over. Anyways the question is: The position of a bucket on a circular tar sands...

hi all, an intersting question in our exam today. we were asked to identify a material given these requiremets "that could have been extracted from product design specifications" "thermally non-conducting, strong at temperatures in excess of 600K, and optically transparent." any ideas?

Note : Please don't connect this post with my performance on PF ... :biggrin: Ok people , I am giving you some info : exams name-----students appeared------my rank(% of students behind me) AIEEE --------400,000---------13,600 (96.6%) BITSAT-------- 48,000----------- 3,500 (92.7%)...

I have a final exam coming up in a few days and I would like some help checking some problems that I have been working through.

I just did a test yesterday and there was a question about cathode ray tubes, it went soemthing liek this. Albert calutated the charge to mass ratio of the cathode rays to be 1.3*10^11 and his velocity to be 3*10^8. His answers didnt agree to that of the textbook. Marie another student...

Hi folks! I'm having my oral exam in physics here in Norway this tuesday. The theme for my exam is "tilting trains". Here is the translated assignement: [FONT=Courier New] What is a tilting train, and how does the physics behind the tilting work? Why is traveling with tilting trains...

I just finished my last exam! I have 91 days of doing absolutely bod all now, (except for the L word, which I can't mention because Sticky Icky and Matthyioeuaouw will get all excitable). WOOOOOOOOOOOOOOOOOOOO!

I've taken the Caribbean Advanced Proficiency Exam in Math, Physics, etc. For physics the topics for unit two were: electricity and magnetism, electronics, and modern physics. The thing is I know the topics well but I just can't finish the exam (I don't think anyone did) but the thing is I want...

hi guys these were some questions i got wrong in a an exam, i was unable to attend the lecture following the exam so i am not sure how to do these two questions that i got wrong i have working, although it is to complicated to put on htis site if anyone can ghet an answer, that would be great...

I have to take this exam in order to transfer my community college organic chem. I need to score in the 75th Percentile (I have no idea what that might be, maybe everyone gets 100s!) So, anyone take it? How'd you do? Anything unexpected? Advice? I have ordered a study guide for it and I'm...

I've got an exam tomorrow and I'm scared. :cry: It's a practical and I've never done one before under exam conditions. I'm worried I'm going to knock everything over or forget where I am and start talking to people or something else dumb like that. I've got butterflies in my tummy. How does...

Hi guys I'm trying to prepare for an exam coming up (that time again :( ) and I've found a few problems in my textbook I don't really know how to do. I really need to do well on this so if anyone could help me out i'd really appreciate it! :D Question1> A curve has parametric equations: x...

hey I'm going through an exam paper and I'm having a difficult time working them out. any help will be greatly appreciated. thanks! the first question is for the size of an atom.. The second virial coefficient, B, at high temperatures equals half the excluded volume due to the repulsive part...

Hi, my exam is coming pretty soon and I looked at last year's exam and found numerous questions that I don't know. Could someone please check my answers listed below. A solution of any type is different from a compound because: (A) a compound is always coloured, solutions never are. (B)...

I just wrote my senior school certificate exam ,but could not solve one of the maths questions .the question is as follows 3 night quard a,b,c blow their their whistle at intervals 8,15,and 18 minutes respectively.if they blow together at 11.00 p.m,when next are they expected to blow together

I have a major exam coming up and we've been given few past exam papers to go through to practice. I have absolutely no idea what to do here :frown:, if people could help me out, work it out etc. It would be greatly appriciated. Link 1: http://img72.echo.cx/img72/3763/question0ex.jpg...

have a final exam on monday, and cannot figure out the stuff on estimators: 1) a random sample of size 2, y1, y2 is drawn from the pdf f(y, theta) = 2y(theta^2), 1 < y < 1/theta. what must c equal if the statistic c(y1 + 2y2) is to be an unbiased estimator for 1/theta. I really don't...

Q. A heat engine cycle is executed with steam in the saturation dome. The pressure of steam is 1 MPa during heat addition and 0.5 MPa during heat rejection. THe highest possible efficiency of the heat engine is. How to calculate heat efficiency? W = QH / COP,hp and COP = 1 / ( TH...

Has anyone out there taken this exam? It's required in most places in the U.S. to get a Secondary Math Teaching License/Credential. I'm taking it in June. Any advice? Was it hard? Easy? What should I study?

Hi, I'm really hoping somebody can help me. basically i have an exam coming up very shortly and from my revision thought i was doing ok with the relativity section. When i have come to look at past exam question i have discovered that although i know my theory i haven't a clue how to actually...

There are two things related to using oscilloscopes that I am a bit fuzzy on for a practical lab exam I will take tomorrow morning: 1) Use the oscilloscope to determine the frequency of the square wave between terminals B and C of the test box. ( We will press and hold down the button on...

Exam revision question. Help! Hello. I have a thermodynamics exam tomorrow. This is a past exam question and I'm not doing very well with it. If anyone has any ideas please help! A charge enters a spark ignition engine at 330K and 1 bar, and is isentropically compressed through a ratio of...

Physics 2 exam tomorrow. Need help with a couple more problems and I am good! :) 1. a circuit has a 137 mH inductor across AB (the whole curcuit is a square with corners ABCD), a 50 ohm resistor across BC, and a 25 uF capacitor across CD with a 115V @ 60 hz power source between DA. What is...

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!

When you have extra time on an exam? My itenary goes something along the lines of: Do exam (mark questions down and skip if questions are allowed and the question isn't worth 50% of the exam) Ask all questions at once Finish exam Review exam Estimate Mark woohoo, 93.6666~ on economics!

Hi, I currently taking Physics: Waves, Optics, Thermodynamics, (calculus-based). There are many books that provide sample exams such as the one call Instructor's Exam File. However, I don't have the one for physics III. Can you help me by posting a sample of your instructor's exam (with...

I was wondering if anyone here has taken the FE exam lately, or at all. When is the best time to take the exam? Maybe senior year? Also, my course schedule allows me to take a few electives, incase I want to take courses from other disciplines for the FE exam (I'm an EE). In my case, I...

urgent help relativity exam in in 5 hours an electrion with mass 9.11e031 kg has momentum 4e-22. what is its kinetic energy the answer is 6.3e-14 J but i have no idea how to get here relativity kinetic energy = (y-1)mc^2 where y = 1/(square root of 1-(v^2/c^2) momentum = ymu thats...

This question appeared on 1986 AP Exam. 1) In water, hydrazoic acid, HN3, is a weak acid that has an equilibrium constant, Ka, equal to 2.8E-5 at 25 degree C. A .300L sample of a .050molar solution of the acid is prepared. Now.. there is a part d) to this question... d) To the remaining...

Ok, if you had a question where a cart (m1) is resting on a surface, and is attached to a string passing over a frictionless pulley, off of which another mass (m2) is suspended in the air, what is the equation that I use? It is like an atwood machine, except m1 is on a surface, and, I need to...

How would I go about solving this problem? Determine the minimum angle at which a road should be banked so that a car traveling at 21.5 m/s can safely negotiate the curve if the radius of the curve is 159 m. If anyone has any sites explaining how to as well I'd appreciate it if you could...

I know this is an easy question but I want to confirm that I've got this right. The wavefunction \psi(r) can be expressed as a linear sum of orthonormal eigenfunctions \phi_n(r) by \psi(r) = \sum a_n\phi_n(r). Derive an expression for the coefficients a_n. I think the answer is a_n...

Hey, in the process of searching for an explanation for this problem tonight, I stumbled across this forum. I usually do well in physics, but our semester exam is tomorrow and, as I'm reviewing, I am drawing a complete blank on everything! I'll just give one problem, to see if someone could get...

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...

this is my second set of questions today, revising for an exam just now. would be grateful to anyone that can answer 1) The pendulum of a clock consists of a thin steel rod carrying a small heavy bob. the clock keeps correct time at 15 degrees centigrade, calculate the error in twenty four...

Hi, I just want to ask a simple question about quantum mechanics... This question appears in it's original form here: http://www.chriscentral.com/physics/PC3101.PDF (question 2) I have had a go and put some notes into the text below... I am stuck on parts c) (ii) and (iii). Any help...

These are questions from my previous tests within this semester that I didn't exactly get correct. I can't seem to figure them out/find an example, nor is my teacher going to be available before my exam. So here I am. I need to know how to solve them, and them to be solved. These are not...

I'm having an exam on graph theory next week and I'm having some problem with understanding the meaning of calculating eigenvalues of adjacency matrices for graphs. My notes suck from the lectures and I'm totally lost... Our professor asked "What is the sum of elements in row k of the...

In my Chemistry class we are doing some old diploma review questions in order to prepare for this year's Chemistry diploma. I have answered almost all of the questions. It says: The above apparatus (I'll explain the diagram later) was used to determine experimentally the molar enthalpy of...

I was in Borders the other day for something, and behind the counter I saw a book, GRE Exam 2005 (comes with cd rom). Does anyone know what that is? It really got my attention and since they had one on the shelf I left with one. It looks like test preparation for some type of test. My gal...

I have a mechanics exam coming up, and I'm going through a textbook answering questions. I'm really stuck on the following: A lift ascends from rest with an accceleration of 0.5ms before slowing with an acceleration of -0.75ms for the next stop. If the total journey time is 10 secs, what is...

Hey what's up guys... Ok i have a calculus final that covers limits, derivatives, and applications of differentiation. Can you give me any pointers or tips on what i should focus on most. I am allowed a sheet of notes, so far i put all the limit laws, and the differentiation rules on it. what...

Since I'm studying for my final exam, I'm going to make you guys suffer. Any help would be appreciated in this. Here's the first one... Find the 40th term of the arithmetic knowing the general term a(n) = a(n-1) + 4 and first term a1 = 13.

These might be really silly problems for a lot of you but I'll have an exam in 2 hours and I still don't know how to do these problem ( which's supposedly the types of questions that will show up in the exam). I'll be really appreciate if someone can help me! 1. An uniform thin rod 80 cm...

OK I've been given a past paper for revision for this years physics exam (I'm 14). There are 3 question I need help with working out Here are the questions 1. Two tugs are pulling on a ship with forces of 1500kgf and 2000kgf respectively, each at angle of 45 degress to the longitudal axis of...

Studying for exam, need help! Hi can someone help me out. My girlfriend has an exam tomorrow and she got stuck on this question. Her professor decided not to give out any solutions she's not too sure if she is heading in the right direction. Any help would be great, thank you in advance...

Just a question to clear things up regarding to the integrating factors for my exams tomorrow: The standard first order differential equation has the form: dy/dx + p(x)*y = q(x). where the integrating factor is e^(integral of p(x) dx). But in one of the previous year paper, it has...