Intro Definition and 563 Threads

Homework Statement The "reaction time" of the average automobile driver is about 0.700 s. (The reaction time is the interval between the perception of a signal to stop and the application of the brakes.) If an automobile can slow down with an acceleration of 12.0 ft/s^2, compute the total...

Homework Statement If a car moving at 90.0 mph takes 400 ft to stop with uniform acceleration after its brakes are applied, how far will it take to stop under the same conditions if its initial velocity is 45.0 mph? Thanks for the help :) Homework Equations The Attempt at a...

Homework Statement It feels good to be back after spending a month in the calculus and beyond section. Here is my question [PLAIN]http://img97.imageshack.us/img97/3883/unleduh.jpg Imagine a spring was pushed back by some distance x_0 and then it ends up at some distance 5m up the ramp...

Hi, Do you know of any motion video capture education software products that are aimed at the first-year college physics course level? Thank you.

What's a good self-teaching book about tensor calculus? Is Schaum's Outline version good? I heard it suffers from lack of proofs/derivations. I want something that's easy to follow and doesn't just throw things out without at least some sort of derivation/ sketch-of-proof / explanation. Also...

I completed my Physics undergrad studies a couple years ago, so I had forgotten a lot of what I learned. But since I plan to start grad school this fall, I have spent the past few months reviewing Griffith's QM and E&M, along with doing a little self-study of grad-level QM from Sakurai. However...

Will someone please explain the foll. doubts in this solved problem from David Morin's book. TIA sree ------------ DOUBTS : 1. What is the principle of eqn. 3.78 ? If V is block speed and Vy is its component in y dirn., why should V + Vy be constant ? 2. In Why should...

I'm about to take my higher upper division classes to complete my mathematics major. I've decided that I'd like to take either Intro to Topology or Intro to Analysis as my topics of choice, along with the required Linear Algebra course that most graduate schools are looking for in applicants...

Half of the classes I want to take have it as a prereq, and it's not offered over the summer. Assuming my school allows it, I want to try to test out. What should I know to be prepared? Thanks, Tyler

My first post here. And I am wondering why I never found this forum before now... :blushing: I am an amatuer astronomer and astrophysicist in the truest sense. I have been interested in astronomy and astrophysics since watching ST:TOS when it first aired back in the 60s. I have also been...

As the title, Anyone know any good readable intro book of material science, especially dealing with electronic materials(semiconductors,etc.)? I am a Physics major in sophomore year.. I took Calc 1-3, linear algebra, ODE and some intro EM and modern physics

I'm looking to start studying Category Theory. What books would you recommend for these? I can't seem to find an introductory book on categories. What is the standard text for such a thing?

Hey everybody, I'm an undergraduate taking an intro grad qm course and I was wondering what books people recommend. I've taken one semester of qm (griffiths level) My school recommends three, landau lifgarbagez, sakurai and merzbacher. We have three L-Ls in the library that can be taken...

Homework Statement 1. Find the general solution to the differential equation: y''-5y'+6y = 0 Homework Equations The Attempt at a Solution m^2 - 5m + 6 = 0 (m-1)(m-5) = 0 y' = Ae^x+Be^5x

abcd

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...

Does anyone have any good websites with practice problems and great in-depth explanations on thermal energy/heat transfer at the introductory level (grade 11)? I've searched many websites only to find questions that are too advanced. Questions like: What mass of steam is produced when 2.4 X 10^6...

Homework Statement One possible concern with MRI (magnetic resonance imaging) is turning the magnetic field on or off too quickly. Bodily fluids are conductors, and a changing magnetic field could cause electric currents to flow through the patient. Suppose a typical patient has a maximum...

Homework Statement No need to include the figure, it's pretty much a piston sitting on some stops. Homework Equations Errmm...none I think The Attempt at a Solution My question is in regards to part c, and then part e. I know that in state 2 it's a superheated vapour...

Hello all, I have come across a couple questions that's seized any progress the past couple days. Any information to guide me through would be genuinely appreciated. I feel some of these questions are merely unfamiliarity with the types of questions, this is my first engineering course. The...

Homework Statement Griffiths Intro to Quantum, problem 2.38: A particle of mass m is in the ground state of the infinite square well. Suddenly the well expands to twice its original size: the right wall moving from a to 2a, leaving the wave function (momentarily) undisturbed. The energy of...

Homework Statement I graduated from college this summer and I have some time on my hands right now. I decided to start working through one of my old books from a class I dropped, Real Analysis. Anyway I really miss the challenge that class posed for me and so I am trying to work my way...

Hi, I was reading ratemyprofessor.com (i know - not a good thing, as most bad reviews are written by lazy students) and I came across something a bit strange. Somebody said that he wouldn't recommend taking the first semester of calculus-based physics unless you've taken calc 3 (multivariable)...

im reading a book intro to python, I am confused by what is ment by the following >>>-17/10 -2 i do not understand this explain pls NOT A HW

Homework Statement Describe on HR diagram a lifecycle of a star with mass 15 times the mass of the Sun. Also calculate T, L, R, t of such star Homework Equations L/L0=(M/M0)^3.5 - from here I can find the luminosity= 1.5*10^5*L0 t proportional to M/L=15M0/L = 11.4*10^-5 M0/L0 - that...

My professor has us using C. Henry Edwards and David E. Penney, Differential Equation and Boundary Value Problems, Fourth Edition. However, I don't really like it as our textbook. Anyone else have any recommendations?

I do not know anything about quantum physics, but due to some timetable clashes i hv to take intro solid state and intro quantum phy in the same semester. One advisor said its ok and he said intro solid state phy is only abt memorizing crystal, but another advisor said it would be tough...

Homework Statement What are the dimensions of the base of the rectangular box of the greatest volume that can be constructed from 100 sq inches of cardboard if the base is to be twice as long as it is wide? Assume the box has no top. Homework Equations V box = lwh A = lw ? The...

How does this compare to other undergraduate intro PDEs texts? http://www.math.umn.edu/~olver/pdn.html

Homework Statement Can someone please explain the following for me? \sum ^{n}_{k=m+1} k^2 = \sum ^{n}_{k=1} k^2 - \sum ^{m}_{k=1} k^2 The Attempt at a Solution I have not done math in a long time, and for some reason this has me baffled. My textbook randomly does it, and does not...

greetings... i study naval arch in china in mandarin, so its very challenging ... at the moment, I am facing difficulties in mechanical design course and i was hoping by making this topic, maybe you fellas could give me some material to study (everything i have is chinese, and i don't get...

Homework Statement Introduction to Quantum Mech Griffiths 4.9for the problem of a finite square well v(r) = {-Vo r<= a (i will call section I) 0 r>a (section II)Homework Equations After I find uI and uII uI = A sin(K r) uII = De^-kr and then set the boundary condition uI =...

Hello All, I am studying for my introductory astronomy exam and I came about these two question; Galileo discovered a) radioactivity b) some moons of saturn c) 2 moon of Mars d) some moons of Jupiter e) the telescope I know he discovered 4 moons of Jupiter but "some" is a bit...

I am currently working through Serway’s Physics for scientists and engineers and the book seems to be fine, but the math does not seem to be calculus based. There are very few problems that incorporate anything more sophisticated than trig or vectors. I am currently in chapter 8. I am...

What is this class like? Is it very hard? I took an intermediate macroeconomic theory course a couple of semesters ago. One of the prerequisites for this class is Probability. I will be taking that next semester. I wonder if I could take these two classes concurrently.

I passed 1st quarter Physics for Life Sciences with an A last spring. Now I plan to take the Calculus version this winter quarter. I looked at the the Physics department's example homeworks and exams and they are totally MULTI-step problems, 2, 3, 4, 5, and 6 steps, symbolic only. They appear...

We're going over the intro stuff to integration and we are being asked to find the value of the sums... Here's the problem I am getting stuck on... \sum_{i=1}^{n} (i^2 + 3i + 4) I know that I have to separate the individual sums, so I put it into this form... \sum_{i=1}^{n} i^2 +...

Please recommend 1 textbook from each of the following 3 pairs. My plan is to self-study up to calc I level and be well prepared for the intro physics/EE courses before the Spring semester. Algebra and Trigonometry, 3rd ed by Beecher Algebra and Trigonometry, 8th ed by Sullivan...

Homework Statement A long cylindrical wire of stainless steel alloy hangs vertically, supporting only its own weight. What is the maximum length the wire can have without experiencing plastic deformation? E = 28 Mpsi Density = 483 lb/(ft^3) Yield Stress 35 ksi Homework Equations...

I was overly ambitious this semester and took on too many courses (4 math courses and 3 econ. courses). I am getting an A in all of my other courses except Intro to Real Analysis which I am doing horribly. I bombed a midterm which brought my overall grade down from an A- to a C. The only way to...

So the tensor calculus part of my into to GR class is kicking my butt. I'm using the book by D'Inverno, but I feel like he's going too quickly over tensor calculus. Is there a more introductory text on tensors that I missed out on? I've taken courses on linear algebra before, but not...

^^ But I hate doing a cold entrance even more xD I'm Bee and I'm a third year EE student at some school in Canada. The main reason I'm posting this is just to throw out there that I feel pretty over my head here (haha) but I've been lurking for months and I'm hoping that maybe I'll learn...

I'm just interested into what part of the class people have trouble with. Of course people are different so the answer may vary but I'm talking in general here. Which topic was the hardest to grasp and solve for your class and yourself. Just curious to see where the bumps may be and if I...

Homework Statement I'm asked to prove that If F is an ordered field, then the following properties hold for any elements a, b, and c of F: (a) a<b if and only if 0<b-a (b) ... ... Right now I'm working on (a) Homework Equations We're supposed to draw from the basic...

Homework Statement On any given day, Amy is either cheerful (C), neutral (N), or mad (M). If she is cheerful today, then she will be C, N, or M tomorrow with probabilities 0.5, 0.4, 0.1 respectively. The rest of the probabilities are given so that we can get the probability matrix P: P = [ 0.5...

Homework Statement Here is a link to the problem that I am having issues with. http://tinypic.com/r/8zfb5h/7 Homework Equations F x perpendicular distance The Attempt at a Solution http://tinypic.com/r/1tamma/7 I have no idea where to go from there, or if I am even...

Homework Statement Let f : A -> B be a bijection. Show that if a function g is such that f(g(x)) = x for all x ϵ B and g(f(x)) = x for all x ϵ A, then g = f^-1. Use only the definition of a function and the definition of the inverse of a function. Homework Equations The...

Homework Statement Every subset of \mathbb{N} is either finite or has the same cardinality as \mathbb{N} Homework Equations N/A The Attempt at a Solution Let A \subseteq \mathbb{N} and A not be finite. \mathbb{N} is countable, trivially, which means there is a bijective...

Homework Statement Verify that the indicated family of functions is a solution of the given differential equation. Assume an appropriate interval I of definition for each solution. Homework Equations dy/dx + 2xy = 1; y = e-x2\int(from 0 to x)et2dt + c1e-x2 The Attempt at a Solution...

This fall I will be taking the class "Engineering 101: Introduction to Computers and Programming". The general course description can be found http://www.engin.umich.edu/courses/eng101/" . It says that we will be learning C++ and MATLAB. I am just wondering how well I will actually know these...