Class Definition and 942 Threads

Looking for online Physics 2 class! I'm looking to complete an online physics 2 course but I can't seem to find any good/accredited programs online. I was wondering if anyone knew of any that they can possibly refer me to. I have already completed the Lab portion of the course through the...

I am having trouble understanding how to find the limit of a function (using the definition of a limit). I have a class example, and was wondering if anyone could walk me through the steps. Homework Statement Using the definition of the limit to show that limx→2(x2)=4 f(x) = x2 c=2 L=4...

Hi!The details is in the attached file. I don't understand the sentence which is bolded,why if we extend the D-cochain to a D-cocycle,then we can get a global form which restricts to the d-cohomology class? Any hints?Thank you!:smile:

hey guys, im a Junior in undergrad going for a bs in professional physics. I have always loved physics and always wanted to do something in that field. I am a pretty good student, i get b's and a's and this semester was my first in upper division courses so my grades are suffering as a...

Hi All, I am a real noob with physics...not my best topic. Trying to do the best I can. Just want to run my noob logic past some people much better at physics than me. We did a lab in class and I think I have the correct answers but just want some confirmation. Homework Statement We...

Is it possible for a lever to change from one class to another during its rotation (e.g. it starts out as a third class lever and ends as a first class lever)?

:biggrin: I need a telescope for my astronomy class next semester :biggrin::biggrin::biggrin: and a $700 budget...having a difficult time deciding which one to get :-/

(x1, y1)Υ(x2, y2) ⇔ x1 × y2 = x2 × y1 for all x1, x2 ∈ Z and y1, y2 ∈ Z+ have been shown to be an equivalence relation in tutorial. Specify the equivalence class [(2; 3)] as induced by Υ. i don't understand what it means by 'Specify the equivalence class [(2; 3)] as induced by Υ.'...

I can't seem to figure out how to derive this relation, so a first step or any suggestions would be greatly appreciated. Thank you in advance. Homework Statement After four cycles the amplitude of a damped harmonic oscillator has dropped to 1/e of its initial value. Find the ratio of the...

Hi :) I'm taking my first java course. I took two C++ courses last year, and I understand OOP pretty decently, but I cannot get this java program to work! And I'm beginning to get really frustrated because I can't find my mistake. This is my class file: package studentsjav; __________...

Any advice on this? Although much is review and I was surviving quite easily for the first few chapters and units, I only took grade 11 physics, so many of the concepts are quite new. The professor just skims through very important and difficult concepts and usually goes off on useless tangents...

I'm in my first programming class (in a university and in general), and it's kicking my butt. The homework is brutal. It consumes around ten hours a week just to complete (usually only three or four programs). But that's not the problem, because I'm averaging around an 85-90 in that (haven't...

Hey guys. I'm currently a senior in high school. The high school that I go to has block schedule. I am in Calculus AB this semester and it will continue through next semester. However, I want to switch into Calculus BC. WIll that be too hard? Is it a big jump, or is it next semester when the new...

This is an exercise 6.43 from Bott's Topology book.I'm not asking it's solution,but ask something relative to it. Let \pi :E \to M\ be an oriented rank 2 bundle. \Phi = d(\rho (r)\frac{{d{\theta _\alpha }}}{{2\pi }}) + \frac{1}{{2\pi i}}d(\rho (r){\pi ^*}\sum\limits_\gamma {{\rho _\gamma...

W or NoPass ? What looks worse on a transcript, W or NP? Also, are there ways to withdraw from a Pass/NoPass class with an Incomplete to be finished later? Of course this might be case by case. Basically I am asking this: If you are in danger of getting a NoPass in a class, what is the...

Homework Statement 3) Let a be an integer = 0 and 6 n a natural number. Show that if gcd(a, n) = 1 then 6 there exists b ∈ Z, such that [a] · [b] = [0] and [b] = [0] in 6 Z/Zn Homework Equations The Attempt at a Solution Ok, so I'm still trying to digest the question and so...

I never really had much math back ground and I was lucky I passed high school math. I was in the hospital a lot, I think my teacher felt sorry for me and gave me a passing grade, so I could get my HS diploma. I decided to go to college and I took my placement tests and they placed me in...

My computer science course is currently going over defining classes in C++. We do three things: 1) Create a header file that declares the class and save it as the class name appended with .h 2) Create a file that includes the header file in (1) and implements the class functions and save it...

This is my first semester as a EE undergrad and I'm having difficulty with my telecom class. These are my current classes: Physics Calculus Intro to C Programming Electronics and telecommunications. Everything else is fine. For telecom, I don't know why they are making us do it in the...

So my understanding is an abstract class is one with at least one abstract method ( ie cannot be executed). It can therefore not bei nstantiated (not entirely sure what instantiated means) An interface I am a bit more confused about. first of all i thought it was where unrelated objects...

hi. i am a freshman majoring in mechanical engineering and i really love math. i am in calculus II right now during my first semester. as a mechanical engineering major, my university requires that engineers only take calculus I, II, and III and differential equations. i already had a bunch of...

My current Physics class which is a regular physics calc based mechanics class isn't very difficult. Actually I already took the class in H.S and got a 5 on the AP Physics C exam. I decided to retake the class because I thought I didn't know enough Mechanics and that it would be good to...

Hi, I have what i think must be a really basic question. What is meant by a class, object, instance and attribute in programming? In simple terms (i don't know computing at all). I thought a class was basically something that could be represented as a noun in everyday life, an object is an...

If you wanted to put ints, doubles, strings into your own container class how would you do it?

Hello, I am a graduate student and I currently taking a class that is unrelated to anything that I am doing in my research or field of study. I was told by my graduate advisor that I would need another class this semester, however, that turns out to be incorrect and I no longer need this...

Greetings, First of all I believe this is the right forum as it isn't necessarily homework but more of a discussion about possible projects/experiments for a modern physics class. If it is in the incorrect forum could a mod please move it. I am currently taking a physics 3 course that...

I am wanting to create my own Dynamometer for my physics class. (Im a student by the way.) I want to leave something behind. This teacher has really helped me get through this class and make it very enjoyable at the same time. And for the class we are suppose to make a project or test a...

My teacher was going over a thevenin and norton circuit and i understand the thevenin and norton part of it, but the part that confused me was when he did the node voltage at the 2 circled nodes to find Ix. I understand why the bottom node would be zero because it is the reference node but why...

As the title says I want to go into Medical Physics. I have one more course requirement to finish my undergrad at the end of the spring semester. None of the courses are offered so I will have to do a independent study to replace one of these classes: Biophysics, Analytical Mechanics, or E&M II...

So, this semester I am taking Calc2 (6 credits here), Physics1 (4 credits), Linear Algebra (3 credits), and OrganicChem1 (4 credits). My Organic Chemistry course is at a strange time on Sundays and it's really inconvenient to attend. On top of that, it's only one day a week, which is awkward...

I am learning about the ArrayList class in my java programming II class. I am wondering why you would specify an arrayList to only contain, for example, strings: ArrayList <String> arrayName = new ArrayList <String> (); versus ArrayList arrayName = new ArrayList (); in which, to my...

Do any students here (or faculty for that matter) actually ride a bicycle to class? For the past few weeks I have been thinking it's a good idea. I live something like 2 miles from my university, and there are virtually no busy intersections that I would have to cross. Lately, traffic has...

I'm not really a big fan of computers but I understand there importance to physics. My school offers computer programming classes for engineering and science majors but I don't want a extra formal class that isn't required. Do you think it would be a good idea to self learn all of the programming?

Is reading the Principia a good idea as a supplement for my physics Mechanics class I will be taking this year. The class is a 1st year class btw, I feel by reading it along with my textbook and lectures I will be able to develop a very deep understanding of Mechanics. Do you guys think it's a...

I'm currently in this grad class, but I have serious doubts I have enough time on my hands from my busy schedule to do well in this class. As a result, I'm considering to just audit the course, which in my university means: "to go to the class without any official recognition." In other words...

I'm going to be starting my first year in college soon as a physics Major and I have very high standards when it comes to physics. Last year I took AP physics C Mechanics and E@M, the problem was that I had 10 other classes in high school so I couldn't devote proper time to physics. So I noticed...

Hi, I have a class, say myclass and it takes two strings (let s and g ) and one int ( say i) as its arguments. It looks like, public class { String s , g; int i ; public void myclass(String sname, String gname, int k){ s = sname; g = gname; i = k; } } Now, I have several...

Often I feel like sitting in class is pointless. Some stuff I already know from reading the book and the stuff I don't know is done too fast for me to learn anything from it. I need to look over examples and new material multiple times before getting it. Video lectures like the ones from MIT for...

I'm planning on continuing my education after about a ten year break. I originally got an AAS in criminal justice. Then I left the country for a long time. Anyway, I'm back now and I'd like your advice. I'm planning on doing some math and science classes at the local community college before...

Background: I'm going to be a junior, having very strong Analysis and Algebra yearlong sequences, in addition to a very intense Topology class, and a graduate Dynamical Systems class. For this coming Fall, I'm sort-of registered for this class, titled "Manifolds and Topology I" (part of a...

I do not know anything about physics but in order to sort my problem out I have been told to look into the impossibility of photon collisions. What I would like to achieve is to take two Class 1 lasers (any wave length you like) and cross the two, in doing so I was hoping that their infinite...

So I've been contacted by a Community college I was hoping to get a small job teaching a 6 hour/week course for some extra money. The course starts monday the 15th but the interview won't take place until the week classes start! Has anyone ever heard of this? My contact said that I will...

Homework Statement V=Matrix (2x2), T(A) = (0 1 ) A , and W = {A\epsilon V: A^{}t = A (1 0) Homework Equations So T(A) transformation, multiplies a 2x2 matix with entries 0 1 1 0 by A with A on the right side The Attempt at a Solution I...

I just came across another question while brushing up on my c++. If you have a base class that uses virtual methods, when you try to use it to define a derived class then you *need* to prefix the base class name with "public", as in the following example. class ExampleBaseClass { ...

Hi, All: I am trying to figure out the mapping class groupof the torus ; more accurately, I am trying to show that it is equal to SL(2,Z). The method: every homeomorphism h: <\tex> T^2 -->T^2<tex> gives rise to, aka, induces an isomorphism g: <\tex> \mathbb pi_1(T^2)-->\mathbb...

Hi, Again: I am a bit confused about this result: Mg/Mg^(2) ~ Sp(2g,Z) (group iso.) Where: i) Mg is the mapping class group of the genus-g surface, i.e., the collection of diffeomorphisms: f:Sg-->Sg , up to isotopy. ii)Mg^(2) is the subgroup of Mg of maps that...

The class is Calc III (multivariable), and I'm taking it online this summer. It ends in about two weeks, and I have 16 1-hour lectures left to watch. This class is horrible. The professor simply reads out of the book then expands on these ideas. However, he is often wrong and spends 10...

Have been reading up on tesseracts lately and I was wondering what class in college if any include the learning of these. Was thinking it would be a physics class of some sort but at the same time it could be a math class too.

Homework Statement Let A be the set of all integers x such that x is = k2 for some integer k Let B be the set of all integers x such that the square root of x, SQRT(x), is an integer Give a formal proof that A = B. Remember you must prove two things: (1) if x is in A, then x is in B, AND...

Just started my physics class. Already need help! Homework Statement A tiger leaps horizontally from a 5.5 m high rock with a speed of 3.1 m/s. So I know Height=5.5 meters Initial Velocity=3.1 m/s Homework Equations How far from the base of the rock will she land?The Attempt at a Solution I...