Class Definition and 944 Threads

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...

Hello again PF, I've been doing some light reading on different magnetic fields of different gas giants, and what was really fascinating is how different Uranus and Neptune's fields were from Jupiter's and Saturn's, due to their different mass and composition? What I read was that both of...

I really want to get a programming internship next summer. Which one of these classes would be the best preparation for one? Object Oriented and Advanced Programming (difficulty: very hard) Database Management Systems (difficulty: moderate) User Interface Development (difficulty: moderate)

Hello, I'm using the article class with a table of contents. Everything works fine, except one point: The List of Figures, List of Tables and the Bibliography appars in the Contens with no points between the Name and the Page where they are. For example: Contents 1 Section 1...

casting in java...&& wrapper class Homework Statement well my question is quite simple. 1..) when a vector is instantiated ,does it needs to have a particular data type like integer,employee... like in case of array or does any object can be put into it irrespective of its name... example...

I need to locate an online Pre-Calculus Class that I can start ASAP and finish by August 22nd. This is very important to me. Otherwise I can not register for two classes I wish to take this Fall. I have already had Pre-Calculus once but under less than ideal circumstances (family, financial, and...

I'm about to fail a class, because the exam is in 4 days and I haven't studied anything about it the whole semester. I really don't feel like studying 12 hours a day until the exam to then get a low grade just to pass this class. Is it too bad if I do it next year? Does anybody care about that...

Hey guys, I'm doing a four year degree course in theoretical physics (British/Irish). I got a 1.1 (first class honours) in last year's examinations (74.75%), which was in second year and counted for 10% of the marks. This year I only managed 58%, which is a 2.2 (second class honours, grade 2)...

Homework Statement So I'm teaching a year 8 (12 year olds) class on air or the properties of air. Does anyone have any ideas of what I should tell them or how to explain these properties in a understandable way? Homework Equations In the document that I have been given it says that I...

How do I go about getting a good grade in thermo? I'm a chemical engineering major and I am scared ****less about this class. I am taking it this fall. I've heard horror stories, and my cousin, who I consider to be a pretty sharp guy is having a really hard time with it. Any textbooks you...

Okay I just checked out my ODE professor's site for next year and I notice that all of her assignments are writing-based... I've attached one of the sample assignments (there are like four writing assignments in one semester...), the marking scheme and a sample article I am a little worried...

In a couple weeks, I'm going to be teaching a summer calculus class and I wanted to introduce my students to the mathematical software that can be used. However, where I teach they do not have maple or mathematica, so I have to use one of the open source programs (octave, maxima, scilab etc)...

Homework Statement Five-sixths of the students in class are passing with a grade of C− or better. Three-fourths of the students in the same class are passing with a grade of B− or better. What fraction of the class is not passing with a grade of B− or better but is passing with a grade...

Whats normal with wait lists? Usually, how many people get into the class? Like typical or average? Every single person gets in who from the wait list most of the time, or?

Hi all, I have read this forum on and off for a couple years' now and have finally started the road to calculus. I have a BA in Econ already (2001) and took the "Business Calc" class way back (that's what the minimum was). I find myself in a technical career (not Econ related), but have...

How to get "Ahead of the class"? Hello Im starting an Access course to physics in september and would like to know what I can be doing to put me in a better position for when i start. I intend on going on to Ph.D level but have no A levels in maths or Physics so i have to start somewhere...

Homework Statement 1962N Load 5 m from effort (hydraulic ram) and fulcrum 1m from effort. Calculate the Velocity ratio, if work input is 3000j calculate work output. Homework Equations VR = distance moved by effort / distance moved by load effort = 11772N MA = load / effort =...

Homework Statement Let n\,\in\,\mathbb{N}. Let F be a field, and suppose that p(x)\,\in\,F[x] is a polynomial of degree (n + 1). Let S be the set: S\,=\,\left\{\left(a_0,\,\ldots,\,a_n\right)\,:\,a_i\,\in\,F\right\} Define \phi: S\,\rightarrow\,F[x]/\left(p(x)\right) via...

For a math class the school says that you study 2-3hours per hour of lecture,well, by study what do they mean? Does the 2-3 hours include doing homework, or is that just additional time on top of the 2-3 hours that they want spent studying for every hour of the lecture of the course?

I'm trying to write a simple program to calculate the impedance of an AC circuit consisting of an arbitrary number of resistors, capacitors and inductors combined in series or parallel. First I ask the user to create the components they wish to use in the circuit, and this is where I hit the...

Hey guys. So this problem asks me write a function that accepts a string, and outputs an array of class logical where the true values are the vowels and everything is false. As of now, I have: And when I run this function for say the string 'AAA' I get 111(The problem with this is that it's...

I realize this probably fits better in Academic Guidance but I figure I'll get better results here. I'm trying to set up my schedule and I'm wondering what, in your personal opinion, were the hardest classes you've had to take. To me hardest doesn't just mean conceptual problems but also the...

Homework Statement 1. Suppose you are told that a star has been observed with a UBV color index of B-V=1.6 and that interstellar reddening is negligible. In addition, its apparent visual magnitude is 9.8. Detailed spectroscopy also reveals that the star has all the characteristics of a main...

Yo, This past fall I took a linear algebra class. Linear algebra is not required for my major, but it looked interesting. For some reason, in this class we seemed to discuss more so the idea of vector spaces and not so much types of matrices. There is a higher level linear algebra class which...

Hi, Everyone: I am reading a paper that refers to a "natural surjection" between M_g and the group of symplectic 2gx2g-matrices. All I know is this map is related to some action of M_g on H₁(S_g,Z). I think this action is...

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So, I'm majoring in Physics and I got an email from my adviser saying that "Intro to Unix" was one of the most helpful classes. They only offer them during 2 times. One is Tuesdays 5:15pm to 6:30pm while the other is online. I've dabbled in Linux distros and use them from time to time, so I'm...

I recently read that in the way we class particles if we measure the properties of two different particles and class them as particle A and particle B and continue to measure the properties of a third particle which we find to be only slightly removed from those of particle A that instead of...

I am about to start Uni' in a few months and I have been thinking of getting a kindle for books and hopefully for textbooks. However I got the understanding an Ipad does better with pdfs a research papers. I am planning to start my undergrad studies in math. is it feasible to use an ipad...

I am currently trying to figure out my Sophomore year first Semester schedule for college and I am stuck on taking Calc 1 during the summer, or teaching myself it to just take Calc 2 at my school or in the summer if I do teach myself it. I major in Adolescent Mathematics Education and these are...

I am having a lot of difficulty on my continuity problems for my Analysis class. 1. Prove that (f O g)(x) = f(g(x)) is continuous at any point p in R in three ways a.) Using the episolon delta definition of continuity, b.) using the sequence definition of continuity, and c.) using the open...

Homework Statement Im working on a lab experiment in my undergraduate physics degree requiring the use of a class 4 laser, i need to characterize this in terms of its power, coherence, pulse duration, wavelength and irradiance. This is a pulsed laser with rough parameters of 1-2J pulse energy...

So for my first semester of college ( I am a Physics Major. ) I have most of my classes picked out. The last one I need is either Introduction to Physics which isn't required for my major nor is it a pre-requisite for anything I need, but I feel it would be useful for preparing for my Physics...

Dear All, I have got a subclass (Panda), which inherits a Print function from the base class (Bear). I'd like to be able to call the base class's function from the subclass. But my complier gives me the following error message: In member function `virtual void Panda::print(char)'...

I am a commuter, transfer, older, and somewhat shy to boot. However, even my professors recommend working together on the problem sets they give out because they scale the difficulty towards working in groups. So how I do start talking to some people? They all seem to know each other and...

im taking circuit theory 2, which is all about ac circuits, but don't have enough money for a book need a place to learn about how to calculate lead and lag based on the inductance and capacitance, nortons and thevinans and all that stuff but in the context of sinusoidal currents and voltages

I'm having difficulties with two UML class diagrams. That's the first one: http://img821.imageshack.us/i/umlv.png/ I can't really read the words next to bird, but it looks like "Tran" and "Saad" ( some kind of bird?) I don't really know how to explain this? You're supposed to describe...

Homework Statement Let P be a true sentence, and let Q be formed by putting some number of negation symbols in front of P. Show that if you put an even number of negation symbols, then Q is true, but that if you put an odd number, then Q is false. Homework Equations So ... the problem...

For a math elective. Our exams are online. I did very poorly on the first exam because I wrote almost all of my answers that warranted it in scientific notation purely out of habit, which were all graded as incorrect. I of course emailed the professors protesting, they will meet and talk...

I have to teach Tires to my class and I want to do something innovative and new that will tie into Physics. Please help and any ideas you have that I could use would be greatly appreciated

Do you think there was a problem with the way you were taught a certain subject? how would you have wanted it?I would have wanted my physics instructor to focus on the concepts more than the exercises and to try to make less careless mistakes in solving them. Also is there something that your...

Just a quick yes/no poll. But share any other thoughts you would like.

I am looking at building a pair of third class levers out of materials found at the local hardware store to lift up some 500lb and 1500lb hulls. I have systematically gone through every option available to move these hull pieces out of the mold and I'm left with two: 1) Modify an "off the...

My degree is for engineering. This semester I will be taking a CAD class, but before I take this class I wanted to know if it would be a waste of my time to take?

If last semester I bought the webassign for my calculus class and we didn't use it, can I use the same webassign for my physics class next semester? I am assuming I am probably going to have to buy another webassign, but I just want to make sure. Thanks.

What topics are typically covered in a 300 level modern physics class?

Hi, everyone: Given a smooth, orientable manifold X, we turn Aut(X) the collection of all self-diffeos. of X into a topological space, by using the compact-open topology. Aut(X) is also a group under composition. The mapping class group M(X) of X is defined as the quotient: M(X):=...

Homework Statement 3rd class lever 5m distance from load to effort and 1m distance from effort to pivot. Load = 1962 Effort required to lift load = 11772N MA = 0.16 or 1/6 ( so there really is no MA) Calculate the velocity ratio of the system ? Homework Equations I have...

Hey everyone, I'm a physics major in junior year that missed out on my classical mechanics class this fall semester because of some prereq stuff. I emailed the professor teaching QM next semester and got in without the necessary classical prereq. He said I should go over "the Hamiltonian and...