Class Definition and 909 Threads

Homework Statement As a background to this...I have no experience with proofs at all. I did not take a formal geometry class in high school (took a shortened summer course that gave a VERY brief overview of proofs) and have not gotten to discrete math in university, so I really do not know how...

1.Homework Statement + Homework Equations Hello, I really need your help, because I'm a Java newbie and I've got stuck in this Java homework. I should implement class ObjectCounter, which has to include two methods: // increase the counter for given object public void add(Object o) //...

For the degree I'm working towards (B.S. Math, minor Physics) I have to take 2 semesters of 2 different sciences. Obviously, physics will cover one of the sciences... I'm currently taking a chemistry class. I'm not finding it very interesting. Should I just go ahead and do a second...

One of my teachers keeps on saying that her subject is one of the most difficult, without any proof, and she says this everyday, and it's getting old, so I thought I'd like to take an informal poll to determine the truth: What is the most difficult core class for physics graduate students out...

So today my Math teacher and I got into a discussion about Carbon Dating and exponential decay. The book gave one equation and I (thinking back to chemistry) got another. They both had the same answer (which was great, my teacher was proud) but we could not figure out why. Here it is: 4...

Homework Statement How much heat is absorbed by a person’s hand if 100 grams of liquid water at 100°C is poured on his hand? (Assume the final temperature of the water will be normal body temperature of 37°C) Homework Equations dont have any The Attempt at a Solution dont have...

Homework Statement How much heat is absorbed by a person’s hand if 100 grams of liquid water at 100°C is poured on his hand? (Assume the final temperature of the water will be normal body temperature of 37°C) Homework Equations dont have any The Attempt at a Solution dont have...

I am reading an Abstract Algebra book, and there is a theorem that says: Thm: If G is a finite group, then the number of elements conjugate to a is the index of the normalizer in G. The book uses the normalizer to mean N(a\in G)=\{ x\in G\colon xa=ax\} Now if the group is S_4, and...

Which class was it ? And what was that, like?

While I'm not so indecisive as to completely let others pick my class for me, I would like your 2 cents on the matter of what I should take. So I have to take one lab science outside of my major (physics), and I have narrowed it down to three: programming for scientists/engineers, chemistry (the...

I've got homework assignment for 6 hours later but I could not even start to solve the problems below. I've done lots of research but I could not understand which equation must be used for each question.1. Compare the thermal velocity with the drift velocity of electrons in a divalent metal...

Didn't really think this question fit the Homework section, so I hope this is alright. I need to have 3 sources "for" and 3 sources "against". The difficulty lies in choosing a subject that when I present the evidence for each side, ppl in class and the prof's eyes don't start to glaze over...

I was thinking of taking the statistical mechanics course for PhD candidates that's being offered next term at my school. My background is pretty typical, I've had Calc 1-3, linear algebra, differential equations, classical mechanics, e&m, thermodynamics with statistical mechanics, all at the...

Hello, I'm looking for some advice over picking a class for my next semester. I am a Biomedical Engineering major, emphasizing in the more computational side of things. I am trying to decide on which computer science elective to take. I can either take Fortran or C++...which one is more...

I am currently taking a graduate level physics course (also required for undergrads) called "Electronic Techniques for Research", and I'm having kind of a hard time in it. I'm thinking that in the worst case scenario, I'll end up with a C in the course. However, currently, my overall GPA is...

For one of my assignments, I have to write a program to add or subtract complex numbers. I wrote a class, and the problem I am having is that one of my methods isn't returning the data to the calling object. I am going to omit the things in my code that I don't think are pertinent. int main()...

Can someone clarify the overall purpose and implications of biasing a BJT Class A amplifier? I just can't get my head wrapped around the entire purpose. As far as I know, biasing the circuit will place it in a certain operating region, but I don't know the limits/implications of doing this...

Homework Statement Show that the families (x+c1)(x2+y2)+x = 0 and (y+c2)(x2+y2)-y = 0 Homework Equations For the 2 curves to be orthogonal their slopes should be negative recriprocles. The Attempt at a Solution I'm pretty sure that for the first set of curves: y'(x) = - (2c1...

I'm going to fail my first proofs class. How do people even learn this!? A bit of cheese with my whine perhaps but I'm more frustrated because I don't know what to do. I am going to fail this class unless I figure it out before our first exam. I read the chapters, take notes, try to understand...

student A comes to 80% of the classes while student B comes to 60%, (A,B are independant of one another), on a given day exactly one student arrived, what is the probability that it was student A P(A)=0.8 P(B)=0.6 P(\bar{A})*P(B)=0.12 P(\bar{B})*P(A)=0.32 C=> only one student...

I want to have an easier semester and I'm thinking about dropping either Globalization or Philosophy and Social Ethics. Which of these classes is usually harder? I know this may vary by professor and the university but in general which of these subjects is more difficult? Based off the...

Homework Statement If some conjugacy class of an element in a group G contains precisely two elements, show that G cannot be a simple group. The Attempt at a Solution This question was longer, with two questions before this one which I could answer and which probably lead to the answer on...

I'm in a bit of a hairy situation right now. Spring 2010 will be my last semester at my current school studying Forensic Science, and in the fall I'll be transferring to a physics program at another school. I'm trying to get some classes in that will help me in th fall before I leave but there's...

Hi My school started a nuclear engineering concentration in the ME/CHE department for the spring and I just wanted to know what are the topics covered typically in a reactor course and what stuff should I brush up on to be sharp for the class? Thanks in advance.

Whenever I'm in a math or science class, I usually understand the material easily. My problem is that my grades aren't that great because of missing assignments. For example, I easily understand my AP Calculus class, but have a C because of missing work. Do you know any ways for me to...

please?

After excelling at honors physics 1 at my high school my 10th grade year i was recommended for the AP physics class which was just introduced to school aimed at seniors. I love science, mathematics and how the world and things work which is why i signed on, however the class is very demanding...

Not sure if this is much of guidance, but seemed to be the best category? Is there a place where I can check nationwide statistics for Undergraduate Physics enrollment? I know that Physics I and II always have a good enrollment of 15-25 students, but as soon as it crosses that upper level...

Some background I am graduating in two weeks with my bachelors. I will have a B.S. in mathematics with three minors: chemistry, biology, and computer science. I am going to start grad school for computer science in the spring and will try and continue my mathematical education by taking...

This is sort of a two part question, so bear with me. I just recently graduated with a BS in chemistry, and I applied to a couple PhD programs for next fall (I deliberately waited until after graduating to apply to graduate school for a number of reasons!). I'm working a part time job right...

I'll try to be as abstract as possible, but where needed, I'll give some concrete examples. If you have any questions, please ask. Note, I'm doing this for my hobby, not for any sort of homework. I've only followed an introductory course on computational complexity, so I'll let that be my...

I can think of at least one negative thing about having a physics final exam worth 60% of the overall grade. Namely, you can perform well year-round only to receive a bad case of test anxiety when it matters most. I just took such an exam, and am now almost certainly (>95% chance) going to fail...

We have this problem for math class: For an interval of 45 minutes, the tsunamis near Hawaii caused by the chilean earthquake of 1960 could be modeled by the equation y= 8 sin (pi/6)t, where y is in feet and t is in minutes. a) find the amplitude and period of the waves b) If the...

what do you learn in an astronomy class, considering taking one , this is not at a university, but at a junior college. Just curious about what topics are covered.

I am a junior in physics. Things have been going pretty good (not flawlessly super) so far, with the exception of one class: upper level mechanics. I just cannot perform at a sufficient level and I don't know why. We just took a midterm a few weeks ago, one which I studied pretty hard for...

What is better to possibly get a C in a class or just drop it and retake it after I transfer somewhere else? I have a really bad Linear Algebra course that is taught by an inept instructor who is well "past his prime." Complemented with a very obscure and difficult to understand book. I've...

hey, I am trying to pick 2 out of these 4 classes. I want to be a well rounded under grad math major. I am in my second year and have done 2 semesters of analysis, 1 abstract algebra, 1 number theory, 2 stats, 1 complex analysis. these are the choices I have narrowed my options down to. I am...

I'm trying to read a bit up on category theory, but I'm a bit confused about one aspect of the proof of Yoneda's lemma. Suppose we have a locally small category C, a functor F : C \to \textrm{Set} and an object A in C. Now according to Yoneda's lemma there exists a bijection from Nat(hom(A,-),F)...

Hello, I am trying to figure out whether I should take this class but I am not sure if I have the requirements for it. My school has a habit of setting the requirements bar low when the class might actually be difficult and need a lot of prior knowledge on the subject. It's called Axiomatic...

Part 1 - Question About Torque Of Lever Arm in a 1st Class Lever Homework Statement A little while back I posted a question about incorporating the torque of a uniform mass and dimension lever arm into the principle of a 1st class lever. Here is the thread for reference...

Hi, I am slowly realizing that for the first time in my college career I have a class that is very difficult to get my head around. Not so much in that I have trouble with the topic at hand, I actually find it quite interesting rather that it seems the class is just plain bad. 1. Our...

Hey all, Which of these do you feel would best support my Physics major? I've satisfied all other requirements for my math minor except for one elective. I was thinking Vector Calculus. I am also able (with approval) to take any of the 5000 level classes listed below. Any input is...

I'm making a program for one of my programming classes and just needed some help! #include <iostream> #include <iomanip> using namespace std; int main() { int number; float feet; float metres; float conv1; float conv2; cout << "Do you wish to convert 1...

I'm just kind of curious how our school's E&M-I class compares to others because it seems like we are learning things at an advanced level (very fun though it can be intense). We started the year off with Special Relativity then went into Vectors; nothing weird yet. Then instead of doing...

This semester I found for a variety of reasons I generally prefer studying material in my classes on my own and with some online help, lectures, notes,etc. I am still in lower/middle undergrad material and I know this methodology won't work for higher level courses as well but is it ok that I am...

this is our last quiz on communication.. fortunately, the whole class got zero on this quiz so the professor arranged a retake and made it a take home exam instead.. this is my last hope on passing the course.. so any help would be greatly appreciated.. 1.A superheterodyne receiver having an...

I am doing a project of hydraulic vehicle. My professor ask our team to install a hydrualic pump and motor in the vehicle. We are considering to purchase a set of hydraulic pump and motor, and we have the following requirements: We have an existing electric motor of 22kW, 60Nm (continous)...

In my engineering class we are learning about finding the true length of a line. I don't understand it at all. We basically work with 2D views of a line in either the profile, front, or horizontal view. I don't understand how to get from one view to the next. Does anyone know of any good...

[b]1. Homework Statement I am suppose to use polar coordinate data to find derivatives, ie x = r cos(theta) y = r sin(theta) r^2 = x^2 + y^2 [b]2. Homework Equations show dtheta/dy = cos(theta)/r show dtheta/dx = -sin(theta)/r...

Hey all, Can anybody recommend any good books for a 3rd year quantum mechanics class? The recommended text is Quantum mechanics by Franz Mandl but on the reviews some ppl say it is very dry. I'm looking for a book with an informal style that i can read cover to cover like Griffiths...